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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (31): 106-112.doi: 10.11924/j.issn.1000-6850.casb2023-0364

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Characteristics of Soil Resources Under Spatial Transformation of Irrigated and Rain-fed Cropland in Sichuan

WANG Xie1,2(), YANG Minfeng3, LI Qin1, ZHANG Yuangai3, TANG Tian1, LONG Tao3, ZHANG Jianhua1, LIU Yonghong2()   

  1. 1 Key Laboratory of Southwest Mountain Agricultural Environment of Ministry of Agriculture and Rural Affairs/Institute of Agricultural Resources and Environment, Sichuan Academy of Agricultural Sciences, Chengdu 610066
    2 Sichuan Academy of Agricultural Sciences, Chengdu 610066
    3 Sichuan Branch of China Tobacco Corporation, Chengdu 610000
  • Received:2023-05-08 Revised:2023-08-19 Online:2023-11-05 Published:2023-10-31

Abstract:

To further reveal the past and present situation of cultivated land soil resources in Sichuan agricultural area, taking the rain-fed cropland and irrigated cropland in Sichuan Province as the research objects, the evolution characteristics of the area, spatial distribution and soil resource composition of the two types of cultivated land from 1985 to 2020 were discussed, and the evolution law of their diversity was evaluated. The results showed that: (1) from 1985 to 2020, the overall area of rain-fed cropland in Sichuan Province showed a decreasing trend, while the overall area of irrigated land showed an increasing trend. (2) The area of rain-fed cropland in the hilly areas of eastern and central Sichuan showed a decreasing trend, while that in Panzhihua-Xichang hilly areas showed an increasing trend. (3) The area of irrigated land decreased in the Chengdu Plain, while it showed an increasing trend in the eastern and central hilly areas. (4) The decrease of rain-fed cropland and the increase of irrigated cropland had obvious overlap, and the soil resources in the area of rain-fed cropland mainly belong to Skeletol primitive soils, Ferralisols and Anthrosols. (5) With the change of spatial distribution of rain-fed cropland, purple soil, yellow soil and paddy soil in cultivated land showed a significant decreasing trend. The above results clarified that the transfer of croplands in Sichuan had led to changes in the structure of regional soil resources supply to agricultural production, and also suggested that water supply capacity and soil type changes should be specially considered for water and fertilizer management in farmland on a large scale.

Key words: irrigation, rain-fed cropland, irrigated cropland, soil type, diversity index