HUBEI AGRICULTURAL SCIENCES

Response and adaptation of plant morphology to drought stress

LONG Hai-yan, DENG Lun-xiu

2019, 58(8): 5-7. doi:10.14088/j.cnki.issn0439-8114.2019.08.001

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Water shortage has become a serious problem of restricting agricultural development. Drought caused by water shortage is one of the most important adversity factors affecting plant growth, development, distribution and product quality. In order to provide scientific basis for the breeding of new drought-resistant varieties, the morphological structure and ultrastructure of plants under drought stress were reviewed.

Study on the land withdrawal of farmers who enter and settle in the city

YANG Chang-yong

2019, 58(8): 8-11. doi:10.14088/j.cnki.issn0439-8114.2019.08.002

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Citizenization of agricultural transfer population has been an important concern of the central government in recent years, but the problem of land withdrawal which restricts peasants to settle in cities has not been solved qualitatively. The existing land withdrawal methods and institutional constraints as well as the literature research results systematically were combed and summarized in recent three years. Combined with the literature and related content, some thoughts on the withdrawal of the contractual right of collective economic organizations were given.

Effects of different cultivation measures on growth characteristics and yield of rice Changnongjing No.1

SHI Lei, JIANG Han-feng, XING Dan-ying, XU Jian-long, XU Yin-yin, JIANG Shuo-chen

2019, 58(8): 12-15. doi:10.14088/j.cnki.issn0439-8114.2019.08.003

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The orthogonal experiment of sowing date, planting density, nitrogen application rate and water content of conventional late rice Changnongjing No.1 was carried out to explore the combination of different cultivation factors. The effects of conventional late rice growth period, major economic traits and yield were studied. The results showed that the sowing date had a significant effect on the whole growth period of rice, while the transplanting density and nitrogen application rate did not reach a significant level. Within the experimental level, with the delay of the sowing date, the growth period is gradually shortened, and the effects of nitrogen application rate, water, and planting density on the growth period have not reached a significant level. Sowing date and nitrogen application rate have significant effects on the yield of tested rice. Factor, the impact on yield reached a significant level, and the effects of transplant density and moisture were small. The best combination of high-yield cultivation of Changnongjing No.1 was A₂（date of seeding May 16）B₂（600 000.0 basic seedlings per hm²） C₃ [nitrogen application rate 360 kg/hm²] D₁ （water layer 0 cm）.

Preliminary study on superior thin planting of multi-branched rapeseed

LEI Wei-xia, FAN Zhi-xiong, RUAN Huai-ming

2019, 58(8): 16-19. doi:10.14088/j.cnki.issn0439-8114.2019.08.004

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In order to obtain the high-yielding cultivation model of the multi-branched rapeseed（Brassica napus L.） line YF368-2, it was studied that the effect of planting density of the line on yield and number of branches. Within the range of density of 8 820~79 410 plants/hm², the number of primary effective branches decreased successively with the increase of density, while the yield increased first, then decreased, then increased. Results show that in the higher fertility rice stubble field yield can be up to 4 350 kg/hm² that can reach or exceed the traditional high yield cultivation model by means of seedling in late August and early September, spraying 15% paclobutrazol（50 g to water 50 kg） during the four-leaf phase, transplanting in early October and transplanting density with around 48 030 plants/hm² This model is not only high yield but also seed-saving, labor-saving, time-saving and high efficiency etc.

Breeding and application of Enhongxiaodou No.1 with high yield and good quality

LI Bi-qin, LUO Jin-hua, HU Cheng-wei

2019, 58(8): 20-21. doi:10.14088/j.cnki.issn0439-8114.2019.08.005

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Enhongxiaodou No.1 is a new red adzuki bean developed from local variety of Longping in Jianshi by the Enshi Autonomous Prefecture Academy of Agricultural Sciences. It is characteristic of high yield ,high protein and good agronomic traits. In 2012, it was certified and released to commercial production by Hubei Provincial Crop Variety Appraisal Committee. The characteristics and cultivation of the variety was introduced.

Effects of plant density on potato traits and yield in high altitude arid area

ZHAO Fan, LIU Shi-hai, CUI Yin-hua

2019, 58(8): 22-27. doi:10.14088/j.cnki.issn0439-8114.2019.08.006

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The relationship between potato yield,other traits and plant density were studied in high altitude arid area by plant density test. The results showed that potato yield increased with the increase of plant number in a proper range, but it decreased with the increase of density when the density reached a certain level. The plant yield and numbers showed a conic model change as Y=12 487.475+5 160.417 2X-236.968 6X², where X and Y ware plant numbers and yield, respectively. A positive correlation was found between plant height and density, the equation was Y=96.566-85.513/X. The optimal density was 75 000 plant per hectare for the best yield in high altitude arid area. The density was negatively correlated with weight per plant and commodity rate, while the function models were conic curves that decreased with the increase of density. There was a positive correlation between commodity rate and the weight per plant,while there was a negative correlation between the plant height and weight per plant and commodity rate. Plant height increased,the rate of commercial tuber and the weight of tuber per plant decreased.

Evaluation of land ecological security in Hubei province based on entropy-weight TOPSIS modeling

MA Yan

2019, 58(8): 28-34. doi:10.14088/j.cnki.issn0439-8114.2019.08.007

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The purpose was to effectively evaluate values and predict the trend of land ecological security in Hubei province. Based on the PSR （pressure-state-response） model, the land ecological security assessment index system of Hubei province was built by entropy method and TOPSIS method, and the land ecological security situation of the province were evaluated. Meanwhile, according to the performance evaluation result, comprehensive performance change trend of Hubei province land ecological security in 2017—2019 were predicted and analyzed by using GM（1,1） model with fractional order. The research results showed that the land ecological security comprehensive value in Hubei province was gradually improved from risk stage to critically safe and to safer stage during 2000 to 2016, but the stage of safer was not high in 2016. The pressure index showed a downward trend, while the state and response indexes showed a generally upward trend. Crucial constraints on the improvement of land ecological security included the development of society and economic, the ecological environment and intensive land use. The land ecological security in Hubei province would show a steady upward trend from 2017 to 2019. GM（1,1） model with fractional order had high simulation precision and was able to predict the land ecological security stage.

Study on land use and cover change in Yan'an city from 1990 to 2015

ZHANG Jie, ZHANG Li, WANG Dao-yun

2019, 58(8): 35-39. doi:10.14088/j.cnki.issn0439-8114.2019.08.008

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Based on land use and land cover data of Yan'an city in 1990, 2000, 2010 and 2015, the land-use cover change characteristic in different period was analyzed by using the methods of the land-use transition matrix, land-use change rate and land-use degree. The results showed that the land-use types had significantly changed from 2000 to 2010. The farmland area had significantly reduction, but the forestland area had increased greatly and the construction land area had increased significantly. The reason was the implementation of Grain for Green Program and the development of urbanization. In 1990—2000 and 2010—2015, the land-use change was relatively small, because these two periods were in the early and late stages of Grain for Green Program. During the whole period of 1990—2015, land use was in the time of adjustment, but the overall situation remained unchanged.

Study on temporal and spatial variation of land ecosystem service value in Linchuan district

LUO Ya-qin, LIU Ping-hui, KANG Ya-li, ZHU Chuan-min

2019, 58(8): 40-45. doi:10.14088/j.cnki.issn0439-8114.2019.08.009

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Taking the Linchuan district of Jiangxi province as a case, using the 2005, 2010 and 2015 land use data and corresponding statistics, the value of land ecosystem services in Linchuan district towns was estimated, and its spatial differentiation law in the past 10 years was explored. On this basis, the evaluation of ecological sustainability of land use based on the value and demand of land ecosystem service was carried out. The results showed that the value of land ecosystem service in Linchuan district in the past 10 years was declining, mainly due to the reduction of forest land and water area and the rapid increase of construction land area. The spatial distribution pattern of land ecosystem service value was "high average value around and low average value in the middle". The sustainable ecological degree of land use was much higher than the critical value, the ecological environment level was high. The number of forest land and water should be protected in future, and the superiority of forest land scale should be maintained.

Research on potential evaluation of farmland consolidation in Jilin province based on the Trinity

WANG Chang, LIU Bo-wen, WANG Dong-yan, LI Hong, TANG Qi-xiang

2019, 58(8): 46-50. doi:10.14088/j.cnki.issn0439-8114.2019.08.010

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In order to scientifically evaluate the potential of farmland consolidation, formulate renovation policies according to local conditions, realize the Trinity comprehensive protection of quantity, quality, and ecology of cultivated land, taking administrative village as the evaluation unit, the potential of farmland consolidation in Jilin province is evaluated, combining three aspects of quantity, quality and ecology. The results show that the quantity potential of farmland consolidation in Jilin province is comparatively small; The quality potential is relatively high in the east and west of Jilin province; The ecology potential is concentrated in the west of Jilin province and Songhua River basin. According to the comprehensive potential evaluation index of the Trinity, the potential of agricultural land consolidation in Jilin province shows a trend of high in the west and low in the east. Therefore, in the renovation of agricultural land, Jilin province should combine regional characteristics and focus on improving the quality of agricultural land, promoting the construction of high-standard farmland, improving the ecological environment of agricultural land, and guaranteeing food security on the basis of ensuring the quantity of agricultural land.

The water environmental quality assessment in Suyahu reservoir

LI Zhong-yuan, WANG Guo-zhong, ZHANG Ji-yu, ZUO Qi-ting, CHENG Huan-ling, HAO Jie

2019, 58(8): 51-55. doi:10.14088/j.cnki.issn0439-8114.2019.08.011

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Three methods were applied to water quality assessment for the Suyahu reservoir, including the single factor water quality identification index, comprehensive pollution index and organic pollution index methods. The assessment was based on water quality data from 2009 to 2015 in addition to water quality requirements. The results suggested that TP and TN were the main pollution factors and the effect of COD, BOD₅ and oil class were secondly in the reservoir, it was the combination of the factors that caused the reservoir water quality only four months qualified, sixty months in bad class water and annual water quality always in pollution; From the perspective of comprehensive pollution, there was only fifteen months that water quality qualified, the rest period in pollution with twenty-eight months in severe polluted, which made its water quality of annual and most of water season was in pollution even severe pollution; From the perspective of organic pollution, there was three months in mild organic pollution for the reservoir and organic pollution index was less than 2.0 in other months, which resulted in its water quality of annual and water season changed between normal and better.

Spatial agglomeration analysis of spatial correlation of atmospheric pollutant SO₂

LIU Mei, ZHANG Dong-you

2019, 58(8): 56-59. doi:10.14088/j.cnki.issn0439-8114.2019.08.012

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Taking the atmospheric pollutant SO₂ of the three northeastern provinces in 2017 as the research object, through global indicators （global Moran index, Geary coefficient）, and regional indicators（Moran’I, local Geary’s C, local Getis’s G）, the spatial aggregation of SO₂ was analyzed and calculated. The detection results of the two indexes were compared. The results showed that in the analysis of spatial autocorrelation, the Moran index and Geary’s C index both indicated that there was significant spatial autocorrelation in SO₂ in the three northeastern provinces; Moran scatter plot, LISA agglomeration map, and local G cluster agglomeration etc. all revealed the local spatial correlation of SO₂ in prefecture-level cities in 36 prefecture-level cities in northeast China, That is, the low-value clusters （cold point） are mainly concentrated in the eastern part of the research area, and the high-value clusters （hot point） are concentrated in the southwest part of the research area; Through the analysis of the two indices, it could be found that in the southwestern part of the research area, Yingkou, Dalian and Tieling are low-high agglomeration areas in the Moran index, and Heihe is an unrelated area. However, in the local G coefficient, Yingkou, Dalian, Tieling are hot spots （high-high agglomeration） and Heihe is a cold spot （low-low agglomeration area）. According to the actual situation, Moran index is better than G coefficient in analyzing the spatial correlation of SO₂.

Study on the gas production potential of straw fermentation of Cosmos bipinnata

ZHAO Zhen-xing, WANG Chang-mei, ZHANG Wu-di, DING Peng-li, YIN Fang, ZHAO Xing-ling, WU Kai, LIU Jing, YANG Hong, LIU Shi-qing

2019, 58(8): 60-63. doi:10.14088/j.cnki.issn0439-8114.2019.08.013

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A batch biogas fermentation experiment was carried out with the straw of Cosmos bipinnata as raw material at （30±0.5） ℃ at constant temperature. The control group （120 mL inoculum） and the experimental group （11.91 g straw of Cosmos bipinnata） were used to test the biogas fermentation. The results showed that the biogas fermentation time of the experimental group was 33 d and the net gas production was 3 248 mL. The gas production potential of the straw of Cosmos bipinnata was calculated, and the gas potential of total solid content was 289 mL/g, and the gas potential of volatile solid content was 282 mL/g.

Effects of two soil improvers on maize growth and yield in northern Shaanxi arid region

LI Xiao-wei, BAI Chun-mei, TIAN Li, LI Xiao-tao

2019, 58(8): 64-66. doi:10.14088/j.cnki.issn0439-8114.2019.08.014

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Two kinds of soil modifiers were applied to improve soil physical structure and microbial activity in northern Shaanxi arid region， and its effects on growth and yield of maize were determined. The results showed that the basal application of soil modifier could significantly increase the plant height， stem diameter， fresh weight， grain NPK content and yield. The application of microbial soil modifier was more beneficial to the absorption of N and P and improved the grain quality than to the polymer soil modifier which only improved the physical structure of the soil.

Preliminary report on the effect of different types of selenium-enriched foliar fertilizer on selenium enrichment in rice

LIU Yun-fa, DENG Hong-jun, LIU Xiao-na, LI Chun-hong, ZHENG Wei

2019, 58(8): 67-70. doi:10.14088/j.cnki.issn0439-8114.2019.08.015

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Three different types of selenium fertilizers were selected for leaf spraying treatment at the same growth stage of the same field of rice in different locations. The clean water treatment was used as control （CK） to investigate the difference of different types of selenium fertilizers on selenium enrichment in rice. The results showed that the Hualongxike brand bio-organic selenium fertilizer （treatment 3 and treatment 4） transformed by selenium-enriched microorganisms sodium selenite had the best effect, and the total selenium and organic selenium content of rice reached 0.3~0.5 mg/kg accurately, meeting the requirements of DBS42/002-2014, good stability and low cost in different locations and different varieties; Treatment 1 application was Nongxike brand selenium fertilizer, the total selenium and organic selenium content of rice was unstable, some points were below 0.15 mg/kg, and some points were above 0.5 mg/kg, which could not reach DBS42/002-2014 requirements; Treatment 2 applied selenium fertilizer of Xizhiyuan brand. The total selenium in rice was below 0.15 mg/kg, and the proportion of organic selenium was less than 80%, which could not meet the requirements of DBS42/002-2014.

Adsorption of nitrobenzene wastewater from solution in activated carbon fixed bed

CHEN Tian-ya, ZHANG Shi-hao, WANG Ya-ru, SHAO Lei, WANG Shi-xin, LIU Jian-fei

2019, 58(8): 71-73. doi:10.14088/j.cnki.issn0439-8114.2019.08.016

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The adsorption behavior of nitrobenzene wastewater solutions with fixed activated carbon bed was studied. The effect of various parameters like bed depths, concentration and flow rates of nitrobenzene wastewater were investigated. The results showed that the lower flow rate, more activated carbon amount and lower nitrobenzene concentration would benefit the adsorption effect. The adsorption data also fitted Bed Depth Service Time（BDST）、Tomas, Admas-Bohart and Yoon-Nelson models well.

Detection and identification of Fusarium thapsinum on imported Sorghum bicolor seeds from USA

WANG Yi, ZHOU Mi-mi, SUN Min-qin, GUO Xiao-ju, LI Bin, WU Cui-ping

2019, 58(8): 74-78. doi:10.14088/j.cnki.issn0439-8114.2019.08.017

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The isolate A009 was obtained from Sorghum bicolor seeds imported from America. It was similar to Fusarium thapsinum in morphology. The results of phylogenetic analysis based on double gene（ITS and EF-1α） locuses showed the isolate A009 clustered within the type strain of Fusarium thapsinum （Gibberella thapsina）. The maximum likelihood was 100%. Pathogenicity test showed that it caused leaf spot and wilt on inoculated sorghum seedlings after 4 days. Based on all above results, the isolate A009 was identified as Fusarium thapsinum.

Spatial patterns of kiwifruit canker disease in orchard at different altitudes in northern Sichuan

WANG Ru-lin, LI Qing, LIU Yuan, LU Xing-li, WANG Ming-tian, WEN Gang, LUO Jia-dong

2019, 58(8): 79-83. doi:10.14088/j.cnki.issn0439-8114.2019.08.018

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An interlaced survey was conducted to investigate the occurrence of kiwifruit canker disease in kiwifruit orchards at different altitudes（high altitude, middle altitude and low altitude） in northern Sichuan. The spatial distribution pattern of the disease was determined by classical aggregation index method and regression analysis method. The results showed that kiwifruit canker disease plants at different altitudes were aggregated in the field, and the basic distribution form was individual population. The optimum theoretical sampling number and sequential sampling number for field sampling of kiwifruit canker disease at different altitudes were calculated, and the optimum sampling square size was determined.

Polygonatum sibiricum plug seedling technology

LIAO Lu-jing, ZHANG Mei-de, AI Lun-qiang, TENG Shu-rui, YU Xia-jun

2019, 58(8): 84-86. doi:10.14088/j.cnki.issn0439-8114.2019.08.019

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The matrix ratio and the size of the cavern in Polygonatum sibiricum plug seedling technology were studied. Using peat,vermiculite,wood sawdust, garden soil and river sand as the substrate,the optimum substrate for seedling raising of the Polygonatum sibiricum was screened. With the same surface area with different hole mesh point plate,the best hole disc size of the Polygonatum sibiricum were select. The results showed that the effect of peat and peat and vermiculite mixed as acupoint disc breeding substrate was best in all aspects. In the hole disc specifications involved in the test,54 cm×28 cm×40 cm,72 hole and volume 40 cm³ were the best seedling plate size.

Study of physiological characteristics in Yuyan new varieties

HAN Hui-ge, WU Zhao-hui, YAN Xiao-mao, LIU Qiao-zhen, ZU Jian-min, LIANG Tao, GAO Yuan, GUO Fang-yang

2019, 58(8): 87-90. doi:10.14088/j.cnki.issn0439-8114.2019.08.020

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Using Henan province self-bred Yuyan new varieties Yuyan 6, Yuyan 7 and Yuyan 10 as research subjects, the soil moisture, root morphology and activity, leaf proline and superoxide dismutase（SOD） activity in three critical periods of growth and development（root-extended period, early and late vigorous growth periods） were determined and compared among the three Yuyan new varieties under natural conditions. The results showed that： compared with other sampling periods, in the late vigorous growth stage, the root morphology among the three Yuyan new varieties differed most, the root length, surface and volume of Yuyan 7, Yuyan 6 and Yuyan 10 were in a significantly descending order. The root activity in late vigorous growth stage, leaf proline content when the soil moisture is the lowest and leaf superoxide dismutase in all the three critical periods were all following the pecking order of Yuyan 7>Yuyan 6>Yuyan 10. Therefore, in Henan province tobacco growing areas, the environmental adaptation ability of Yuyan 7 is stronger, which is followed by Yuyan 6, Yuyan 10 has the worst environmental adaptability.

Research on landscape design language of traditional villages：A case study of Yishala village in Panxi region of Sichuan province

ZHANG Shao-ying, YE Yi-bing, JIA Shu-feng, YANG Yun

2019, 58(8): 91-96. doi:10.14088/j.cnki.issn0439-8114.2019.08.021

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The related concepts of traditional villages and landscape languages were expounded and studied and a system that can effectively identify the landscape characteristics of traditional villages was established. Taking the Yishala village in Panzhihua, Sichuan as an example, detailed analysis and demonstration from the three aspects of "context-grammar - vocabulary" were made in order to make sure that the system can be accurately understood, conveyed and used as a language. This is not only helpful to the continuation of the traditional village landscape, but also provides another way of thinking and method for the inheritance and innovation of the traditional village landscape language under the new era background.

Effects of three growth regulators on the seedling growth of Hippeastrum hybridun

ZHOU Mo-hua, WU Xiao-ye, YUAN Jia-ming, GUO Xiang

2019, 58(8): 97-101. doi:10.14088/j.cnki.issn0439-8114.2019.08.022

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The effects of different concentrations of three growth regulators salicylic acid, gibberellin and naphthalene acetic acid on the bulb size, leaf growth, chlorophyll content and root growth of the seedlings of Hippeastrum hybridum ‘Double Dragon’ were studied. The main results were as follows：the rational spraying of growth regulators（salicylic acid and gibberellin） promoted the growth of the leaf width,leave length and the bulb, and the effect of spraying 100 mg/L salicylic acid about 6 times was the best. Spraying salicylic acid and gibberellin 3 times significantly increased the chlorophyll content, of which gibberellin was the most obvious. The optimum concentration （50 mg/L） of naphthalene acetic acid was the most significant factor in promoting the root number of the seedlings.

Effects of the concentration of NAA and nutrient solution on the root system,branches and leaves of Schefflera octophylla （Lour.） Harms

BAI Xiao-ming, MA Ji, WANG Xue-yao, YANG Dong-xia

2019, 58(8): 102-104. doi:10.14088/j.cnki.issn0439-8114.2019.08.023

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Rapid induced the root and branches by hydroponics technique, with different concentrations of NAA and nutrient solution to treat the branches of Schefflera octophylla （Lour.） Harms, and the optimal concentration of NAA and nutrient solution for its root growth were obtained by means of experimental statistics and variance analysis, namely the optimal concentration of NAA was 15 mg/L, the optimal concentration of nutrient solution was 200~300 mg/L（about 1/4 of mother liquid）. After induced successful, the roots and branches were most developed when nutrient solution concentration was 500~600 mg/L（about 1/2 of mother liquid）. So, the same hormone and the same nutrient solution on the Schefflera octophylla （Lour.） Harms varied greatly at the different concentration.

Effect of feeding frequency on growth,feed utilization,digestive enzyme activity and body composition of hybrid bream

QIU Ting-ting, WANG Xiu-juan, MA Heng-jia, WU Yu-bo, CHEN Xiao-jie, CHEN Xiao-rong, BAO Jun-dong

2019, 58(8): 105-109. doi:10.14088/j.cnki.issn0439-8114.2019.08.024

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An eight-week feeding trial was conducted to examine the growth, feed utilization, digestive enzymes and body composition of juvenile hybrid bream at different feeding frequencies. Fish were fed a test diet at 0.5,1,2,3 or 4 meals/d. The weight gain significantly increased with increase in feeding frequency from 0.5 to 3 meal/d, and afterward did not change with feeding frequency from 3 to 4 meal/d. With the increasing of feeding frequency, the feed intake and body lipid content of fish significant increased, while intestinal trypsin activity and body moisture content of fish significant decreased. The feed conversion ratio exhibited a downward trend first and then an upward trend, with the increasing of feeding frequency, and fish fed 0.5 meals/d exhibited highest FCR, while fish fed 2 and 3 meals/d exhibited lowest FCR. No significant differences were found in intestinal amylase activity, intestinal lipase activity, body crude protein content, body ash content and muscle amino acid composition among all the feeding frequencies. The present study reveals that the optimum feeding frequency is 3 meals/d for hybrid bream with the highest feed utilization.

Green production technical regulation for integrated farming of “one season rice with three seasons shrimps” in Jianghuai area

ZHANG Jia-hong, YE Hao, ZHU Ling-yu, MAO Fa-yong

2019, 58(8): 110-112. doi:10.14088/j.cnki.issn0439-8114.2019.08.025

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It elaborated auxiliary projects ’construction program in green production of eco-farming of one season rice with three seasons shrimps which is “three majors, two waters, two nets”, space-time coupling technology of one season rice with three seasons shrimps, and technical specification of green nutrition as well as green prevention and controlling. It designed to provide technical operation regulation for green production, realizing dual purpose of water and multi harvest of field to develop comprehensive farming in rice field.

Influence of different solutions on the fresh-keeping effect of cut chrysanthemum

ZHENG Peng-li, SONG Yan, ZHOU Ming-qin

2019, 58(8): 113-116. doi:10.14088/j.cnki.issn0439-8114.2019.08.026

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By measuring the flower-path, the vase life and the amount of water absorption of Chrysanthemum morifolium Ramat., the effects of the different concentrations of 6-BA and AgNO₃ on the preservation of Chrysanthemum morifolium Ramat. were studied with 30 g/L sucrose+75 mg/L citric acid as a control, and the appropriate fresh liquid formula was figured out. The results showed that the treatment with 6-BA and AgNO₃ could prolong the vase life of cut Chrysanthemum morifolium Ramat. Among them, treatment 1（30 g/L Sucrose+75 mg/L Citric acid+20 mg/L AgNO₃+0.5 mg/L 6-BA） could significantly increased the flower-path by 4.07 cm and slow down the aging process. Besides, the harm of water stress was reduced, and the vase life of cut chrysanthemum was increased to 31 days.

Preservative effects of different fresh-keeping treatments on Hanjiang cherry storage under ice temperature

LI Hui, WAN De-hui, LIU Zhi-pei, WU Feng, XIE Ju-ying, WANG Lu, XIANG Shi-biao

2019, 58(8): 117-120. doi:10.14088/j.cnki.issn0439-8114.2019.08.027

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In this study, three treatments such as, controlled atmosphere（80% N₂+15% CO₂+5% O₂）, 3 ppm ozone, negative ion treatment, was conducted in Hanjiang cherry storage under ice temperature. The preservative effects of the three treatments was evaluated by measuring the changes of vitamin C, Brix value, organic acid, water loss rate and decay rate during storage. The results showed that the controlled atmosphere treatment and negative ion treatment could effectively prolong the storage time. When stored for 20 days, the decay rate was only about 22% and the fruit quality could be maintained. The loss of vitamin C, soluble solids and organic acids in Hanjiang cherry fruits were delayed. Ozone treatment could also prolong the storage time and reduce the rotting rate of fruit, but the color of fruit epidermis was easy to change and affect the sensory and quality of the fruits. It suggested that negative ion treatment and controlled atmosphere（80% N₂+15% CO₂+5% O₂） treatment could be the ideal storage methods of Hanjiang cherry.

Spectrometric investigation of the antioxidant activities of Terminalia polyphenol against DPPH free radicals

LI Xiao-fen, XIONG Hua-bin, ZHANG Hai-fen, ZI Yuan-li, ZHANG Yan, GAO Yun-tao, ZHANG Yan-li

2019, 58(8): 121-125. doi:10.14088/j.cnki.issn0439-8114.2019.08.028

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The UV-Vis absorption spectrum of Terminalia polyphenol which is natural antioxidant and DPPH free radicals was investigated,and the determination wavelength and the time for the reaction of Terminalia polyphenol with DPPH free radicals were optimized. Furthermore,the DPPH free radical scavenging activity of Terminalia polyphenol was evaluated. In the optimized systems,the half inhibitory concentration （IC₅₀） of four Terminalia polyphenol against DPPH was ranked as follows： gallic acid（0.0009 2 mg/mL）﹤caffeic acid（0.003 43 mg/mL）<vanillic acid（0.55 mg/mL）<p-coumaric（2.27 mg/mL）, which were comparable with the standard antioxidant rutin, and the antioxidant activities of gallic acid and caffeic acid significantly better than rutin. The results suggest that gallic acid and caffeic are the main antioxidant active components in Terminalia.

Different dry means on the contents of total saponins and esculentoside A of Phytolacca americana

XIE Qi-liang, CHEN Zhong, PAN Yan, YANG Jun-jie

2019, 58(8): 126-128. doi:10.14088/j.cnki.issn0439-8114.2019.08.029

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UV spectrophotometry was used to determine total saponins of Phytolacca americana by the sulphuric acid vanillin colorimetric method,HPLC-UV Method was used to determine the content of esculentoside A. Results showed that their contents of the group dry in the shade were Significantly lower than the other groups,the group dry in the sun were the second from the bottom,the group dry hot air were higher. Among them, the content of total saponin of Phytolacca americana was the highest dry at 55 ℃, and the content of esculentoside A was the highest dry at 80 ℃. It should be dried in time, avoiding the loss of ingredients, drying in large scale is better than traditional drying, and drying at low temperature is advisable.

Research progress in the determination of semi volatile organic compounds in drinking water

ZHAO Li, SHI Zhen, LIANG Zhi-jian, ZHAO Yong

2019, 58(8): 129-132. doi:10.14088/j.cnki.issn0439-8114.2019.08.030

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This paper introduces the pre processing and detection method of semi volatile organic pollutants in drinking water, the paper summarized the methods of liquid-liquid extraction, solid-phase extraction, solid-phase microextraction, liquid phase micro extraction, hollow fiber membrane extraction and solid phase extraction, sample pretreatment, and on the analysis of the essential correlation detection method of organic matter, and progress on determination of semi volatile organic pollutants in drinking water are discussed. The purpose is to provide a reference for the detection of semi volatile organic compounds in water.

Dynamic simulation of mud-fruit separation of water chestnut harvester

WANG Rui, SONG Shao-yun, LIAO Jian, LI Xu, YIN Fang, ZHONG Chong-zhou

2019, 58(8): 133-135. doi:10.14088/j.cnki.issn0439-8114.2019.08.031

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Virtual dynamic experiment was carried out on mud-fruit separation of water chestnut harvester by muti-disciplinary collaborative simulation. Firstly,virtual prototype of mud-fruit separation equipment was set up, and then dynamic simulation was carried out on its’ rigid-flexible coupled dynamic model to get motion law of vibration equipment. Subsequently particle system model of water chestnut-mud was created and discrete element simulation was carried out on it. Several simulation experiments were carried out by changing the thickness and wideness of spring steel plate. The result showed that separation effect was better with the increasing thickness of the spring steel plate in certain extent, but the wideness of it had less impact.

Impact of shooting models on four moth species identification by using automatic recognition system in Fujian province

LU Ci-ding, HUA Yin, LIN Da-kun, HAN Xiao-hong, LIN Hao-yu, CAI Xiao-ming, HUANG Shi-guo, ZHANG Fei-ping, LIANG Guang-hong

2019, 58(8): 136-140. doi:10.14088/j.cnki.issn0439-8114.2019.08.032

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This study was performed to figure out the impact of shooting models on moth recognition based on images of hundred of specimens from four common forest moths in Fujian province. All specimens images were taken and collected under different shooting mode, and recognized and analyzed by using MATLAB 2009 and statistical software. The results showed that： ① The shutter speed of the SLR camera had a significant impact on the recognition rate （P<0.05）, with 1/2000s or 1/4000s as the best shutter speed, however, the sensitivity （ISO） and aperture （f） size had no significant influence on the recognition rate （P>0.05）. ② The recognition rate of SLR （93.3%） camera was the highest among three cameras, but there were not remarkable impact of different three cameras on the recognition rate （P>0.05）. ③ There was a significant influence on recognition rate among different shooting angles （P<0.05）, and the angles range from 90°to 120° were the best. Consequently, to improve the image quality and the recognition rate, we suggested operator try to use shooting angles from 90°to 120°, combining the shutter speed and angles together. This research is supposed to lay a foundation for the optimization, application and promotion of moths image recognition technology in the future.

Research on the intention behavior of rural migrants participating in the Three Gorges Project based on SEM

WANG Yang, ZHANG Shuang

2019, 58(8): 141-144. doi:10.14088/j.cnki.issn0439-8114.2019.08.033

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The resettlement compensation problem of rural migrants caused by the development and construction of engineering projects has become an important risk factor affecting social stability. A questionnaire survey was conducted taking the immigration of the Three Gorges Project in Fuling district of Chongqing as the research object. Selecting variables from the three aspects of rural immigrants' demand level, individual cognition and village characteristics, the structural equation model was used to analyze the behavior logic of the rural public participation during the post-migration support program. The results show that the rural migrants have more serious living poverty after the completion of the construction project, which is characterized by high poverty rate, low employment rate and low income. The fundamental reason for the slight weakness of the post-migration support program is that it is difficult to grasp the key needs of rural migrants, and the participation of rural migrants is relatively low. The participation behavior of rural immigrants in the post-migration support program is significantly affected by their behavioral intentions, which is affected by the comprehensive level of project immigration needs, personal cognition and village characteristics. Catering to the needs of rural immigrants, building an effective participation platform and policy guarantees are important measures to promote the effective participation of engineering immigrants.

Visualization analysis of water resources research in Karst region based on CiteSpace

CHEN Si-yuan, LU Dan-dan, CHENG Hai-mei

2019, 58(8): 145-149. doi:10.14088/j.cnki.issn0439-8114.2019.08.034

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In order to explore the hotspots and frontiers of water resources research in China's Karst areas, quantitative analysis of the main research forces and temporal and spatial evolution characteristics of water resources research in Karst areas, and explore its development trend, the scientific text data mining visual network analysis software CiteSpace is used to quantitatively analyze the scientific literature related to water resources research in the Chinese Knowledge Network （CNKI） database from 1991 to 2018, the results are represented by visual network from the aspects of research time, keywords and centrality, major research authors and institutions. The results show that the number of research papers on water resources in Karst areas in China has shown a tortuous upward trend over time in the past 30 years, and it has always been a hot spot for scholars. Karst groundwater, rocky desertification, and water resources carrying capacity are the hotspots of water resources research in Karst areas. Su Wei-ci, Liang Hong, Liang Bin and other researchers are authors and knowledge transmitters of water resources research in China's Karst region. The main research institutions include the Institute of Karst Geology, Chinese Academy of Geological Sciences, the Chinese University of Geosciences （Wuhan） and other research institutes and universities. To this end, it is proposed to continue to expand the extension and connotation of water resources research in Karst areas, to comply with the trend of social and economic development, and to seek new solutions.

Study on the legal issues of land management right trust under the “Separation of Three Rights”

GONG Peng-cheng, GUO Chen-yu

2019, 58(8): 150-153. doi:10.14088/j.cnki.issn0439-8114.2019.08.035

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The legal problem of the rural land management right under the “separation of three powers” was delved, and we held that the trust of land management right not only conforms to the practical needed of rural economic development, but also had certain policy and legal basis. However, in practice, trust of land management rights would faced legal obstacles such as unclear land property right system, excessive government intervention, lack of risk control and supervision system. It was necessary to perfect the legal system of land property rights, changed the role and function of the government, established the risk control and supervision system, and established the trust system of land management rights, so as to promoted the long-term development of rural economy.

Research on knowledge mapping of rural residential consolidation in China：A visual analysis based on CiteSpace

WEI Meng-jun, WANG Yun-ping

2019, 58(8): 154-158. doi:10.14088/j.cnki.issn0439-8114.2019.08.036

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Using CiteSpace software,a visual analysis of 3 075 papers on rural residential consolidation collected by China Academic Journal Network Publishing Library （CNKI）, from 1995 to 2018, is carried out. The volume trend and the knowledge maps of research hotspot, major research institutions and the core of author groups were analysed, revealed the development process and trend of rural residential land consolidation research.

Study on the influence of “High-speed Railway Age” on the tourism economic development of Guilin：Taking Gui-Guang high-speed railway as an example

ZHANG Li-zhong, ZHANG Tian-wen, ZHANG Le-tong, ZHAO Lin-long

2019, 58(8): 159-160. doi:10.14088/j.cnki.issn0439-8114.2019.08.037

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The era of high-speed rail has promoted the rapid development of tourism in China. The development of Guilin tourism before and after the opening of Gui-Guang high-speed railway was studied and analyzed by using the tourism economic indicators and attraction model, and the tourist volume of Guilin by using the grey forecasting model was forecasted and analyzed.

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