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    Preliminary research on evaluation index system for comprehensive potential of natural resources in China
    DING Shou-yi, JIA Qi-qi, LI Qing-jia, LIU Ze-jin
    HUBEI AGRICULTURAL SCIENCES    2024, 63 (9): 15-21.   DOI: 10.14088/j.cnki.issn0439-8114.2024.09.004
    Abstract202)      PDF (5477KB)(28)       Save
    Taking into account the administrative management requirements for unified and classified natural resources, the development potential of land, forest, grassland, wetland and water resources was evaluated based on resource attributes, natural conditions and disaster risk. On this basis, a systematic, reasonable and objective evaluation index system for comprehensive potential of natural resources was constructed. Combining multiple statistical data and remote sensing data, the comprehensive potential of natural resources of Chinese provincial-level regions was evaluated, and potential zoning was conducted using the dominant factor method. The empirical results showed that the western region, the middle and lower reaches of the Yangtze River, and the northeast had high comprehensive potential of natural resources; and regions with low comprehensive potential of natural resources such as Beijing and Tianjin needed to leverage their economic development advantages. The evaluation index system for the comprehensive potential of natural resource proposed in this study was applicable to the evaluation of natural resource development potential in regions of different scales, and could effectively identify the types of superior natural resources in regions, which provided support for local natural resource management and optimization adjustment of main functional areas.
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    Characteristics and risk of nitrogen and phosphorus losses of typical rice-crayfish farming patterns in the Jianghan Plain
    ZHANG Yi-jie, ZHUANG Yan-hua, ZHANG Qin-jing, ZHANG Liang, ZHANG Fu-lin
    HUBEI AGRICULTURAL SCIENCES    2024, 63 (9): 28-34.   DOI: 10.14088/j.cnki.issn0439-8114.2024.09.006
    Abstract182)      PDF (10780KB)(22)       Save
    Houkou Twon, Qianjaing City, Hubei Province, a typical area of rice-shrimp integrated farming in Jianghan Plain, was selected as the study area to reveal the characteristics and risk of total nitrogen (TN) and total phosphorus (TP) losses in rice season under three typical patterns of rice monoculture (RM), rice-crayfish coculture (RCC) and rice-crayfish symbiosis (RCS). The results of the field in situ monitoring indicated that the surface water level in RCS was significantly higher than that of RM and RCC during the whole growth period (P<0.001). Additionally, the average TN concentration was highest in the RCS [(4.44±6.61) mg/L], followed by RM [(3.23±5.54) mg/L] and RCC [(2.95±4.71) mg/L]; the average TP concentration was highest in RCC [(0.38±0.46) mg/L], followed by RCS [(0.37±0.42) mg/L] and RM [(0.22±0.26) mg/L]. TN loss loads of RCC and RCS were 1.39 and 1.19 times of RM, respectively; and the TP loss loads of RCC and RCS were 2.19, 10.16 times of RM. Overall, the loss loads of the rice-crayfish farming patterns were higher than those of the rice monoculture pattern. The critical periods for TN and TP loss in RM and RCC were the coupling period of the 1 week after fertilization and the rainfall, and the critical periods in RCS were during the drainage period for shrimp harvesting. In RM, the critical factors affecting the TN/TP loss were rainfall and fertilization; in RCC, the critical factors were rainfall, shrimp bait use and frequent anthropogenic drainage; in RCS, the water management with high surface water level and the anthropogenic drainage during the shrimp harvest were the critical factors.
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