Soil quality evaluation of different land use types and its obstacle factors in dip/anti-dip slopes in karst trough valley area
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The College of Geography and Tourism at Chongqing Normal University

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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    Abstract:

    The Different rock strata inclinations can affect the soil flow/leakage and soil microorganisms on the erosion slope which results in the great difference of soil quality on the dip/anti-dip slope in the karst trough valley. In order to accurately evaluate the soil quality characteristics of dip/anti-dip slope erosion slope in Qingmuguan Karst trough valley, five typical? land use types (forest land, grassland, bare land, corn land, pepper land) were taken as the research objects. and there were 12 physical and chemical indexes as total data set (TDS). The principal component analysis method was used to combine the norm value to establish the minimum data set (MDS) of the evaluation index, and the soil quality in the study area was evaluated by membership function and nonlinear soil quality evaluation methods. The results showed as follows: 1) The minimum data set of soil quality evaluation indexes (MDS) in karst troughs valleys included capillary water capacity, capillary porosity and total phosphorus. 2) According to the nonlinear soil quality evaluation method, the soil quality of anti-dip slope (0.519) was better than that of dip slope (0.451). The soil quality of anti-dip slope forest land was the best (0.653), and that of pepper land was the worst (0.426). 3) The determination coefficient R2 of the nonlinear evaluation method is higher than the membership function for the dip slope and the anti-dip slope, so the non-linear scoring model is more suitable for the karst trough valley; 4) There were significant differences in soil quality barrier factors, and only total nitrogen was the common barrier factor. In conclusion, it is more beneficial to restore and improve soil quality by appropriately increasing grassland and forest cover in karst trough valley. The results of this study can provide basis for soil quality control and rational fertilization of slope erosion dip/anti-dip slope in karst trough valley according to local conditions.

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History
  • Received:June 20,2023
  • Revised:July 27,2023
  • Adopted:September 06,2023
  • Online: January 15,2024
  • Published: