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    Analysis on the correlation between cultivated land landscape fragmentation and regional grain yield change
    CHEN Xi, HE Zhen, FANG He-nan, ZHAO Xue-mei, LU Guo-wen, XUE Kai-ren
    HUBEI AGRICULTURAL SCIENCES    2023, 62 (3): 1-7.   DOI: 10.14088/j.cnki.issn0439-8114.2023.03.001
    Abstract398)      PDF (3364KB)(205)       Save
    Based on the land use image and grain yield data of the Chinese Academy of Sciences with a resolution of 30 m, and with the help of landscape ecology methods and spatial statistical analysis methods, this paper explored the correlation between the landscape fragmentation effect of paddy fields and dry lands and the change of grain yield in Qianjiang City at the landscape level and township scale. The results showed that the grain output of the study area was basically stable from 2010 to 2018; the internal structure of cultivated land in the towns and townships in the southeast was basically stable, while the remaining towns and townships were showing an increasing trend of change, and most of these towns and townships had changed from increase to decrease after 2010; the fragmentation effect of paddy field landscape was greatly affected by the number of patches, while that of dry land landscape was greatly affected by the shape and internal structure of patches. In order to ensure the balance of regional grain output, the shape of dryland landscape in the region should be improved, control the fragmentation of internal structure should be controlled, so as to ensure the safety of regional grain production.
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    Research on the identification of cultivated land quality key elements in Changsha-Liuyang-Pingjiang Hilly Region at multi-scale
    HOU Lei, DUAN Jian-nan, LI Ping
    HUBEI AGRICULTURAL SCIENCES    2023, 62 (3): 8-15.   DOI: 10.14088/j.cnki.issn0439-8114.2023.03.002
    Abstract346)      PDF (4288KB)(218)       Save
    In order to further protect and improve the comprehensive quality of cultivated land and identify the key elements of cultivated land quality, the Changsha-Liuyang-Pingjiang hilly area was selected as the research area, and the geographic grid and spatial autocorrelation analysis method were used to delineate the three-level research scale with the characteristic scale of 60 km. The spatial correlation degree and change law of various components of cultivated land quality at different scales had been evaluated and revealed. The results showed that all the elements of cultivated land quality showed positive spatial correlations. Among them, the three elements of irrigation guarantee rate, organic matter content, and cultivated layer texture were the key elements that affect the quality of cultivated land, no matter what scale they were based on. In addition, the degree of concentration and fragmentation of cultivated land were shown as key elements of cultivated land quality on the second and third scales; the background quality of cultivated land contributed the most to the overall quality of cultivated land, followed by spatial and ecological quality; as the observation scale increased, the Moran's I index value of each element of the spatial and background quality increased immediately, while the Moran's I index of the ecological quality element decreased as the scale became larger.
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