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[1]HU Lei,SHE Dongli,YANG Zhen.Stability of Soil Aggregates and Its Differentiation Characteristics in Small Watersheds in Loess Hilly Region of Northwestern Shanxi[J].Research of Soil and Water Conservation,2022,29(01):72-77.

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Stability of Soil Aggregates and Its Differentiation Characteristics in Small Watersheds in Loess Hilly Region of Northwestern Shanxi

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 01 Page number: 72-77 Column: Public date: 2022-02-20

Title:: Stability of Soil Aggregates and Its Differentiation Characteristics in Small Watersheds in Loess Hilly Region of Northwestern Shanxi

Author(s):: HU Lei¹, SHE Dongli², YANG Zhen¹; (1.College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China; 2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling 712100, China)

Keywords:: soil aggregate; soil structure; land use; watershed; path analysis

CLC:: S152.3

DOI:: -

Abstract:: Soil aggregates are the basic components of soil structure and play an important role in affecting water infiltration and transfer, and soil fertility. Analysis of the structure characteristics of soil aggregates and their stability influencing mechanism is of great significance to reveal the ecological and environmental effects of Grain for Green on the Loess Plateau. We took soil aggregates under different land use patterns(forest, grass, farmland)in seven dam-controlled small watersheds in the Zhujiachuan Watershed of northwest Shanxi as the research objects, and used the spatial analysis module of the GIS platform to extract the topographic factors of the sample points, and the wet sieve method to analyze the particle size composition of water-stable agglomerates, and analyzed the influence of physical and chemical factors on the fractal dimension by the method of path analysis. The results show that there are significant differences in the stability of soil aggregates under different land use methods in the Zhujiachuan watershed of northwestern Shanxi; the order of stability of aggregates is: forest>grass>farmland; the fractal dimension is significantly positively correlated with the contents of small-sized aggregates, but is significantly negatively correlated with the contents of large-sized aggregates; the soil aggregate stability of the Houhuigou watershed in the lower reaches of the watershed is most susceptible and the structure stability of the soil aggregates in the Liushuzuigou watershed in the middle reaches is optimal; the factor that has the greatest influence on the fractal dimension of soil aggregates is organic matter content, followed by altitude, and the direct path coefficients are -0.427 and -0.229, and the decision coefficients are 0.168 0 and 0.085 6, respectively. These research results can provide the scientific basis for ecological restoration and rational use of land in the Loess Plateau.

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Last Update: 2022-02-20