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[1]OUYang Tiantian,DUAN Xu,ZHAO Yangyi,et al.Characteristics of Soil Aggregates in the Preferential Flow Area and Matrix Flow Area of Typical Forest-Grassland in Yuanjiang Dry-Hot Valley[J].Research of Soil and Water Conservation,2023,30(03):146-153.[doi:10.13869/j.cnki.rswc.2023.03.014]

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Characteristics of Soil Aggregates in the Preferential Flow Area and Matrix Flow Area of Typical Forest-Grassland in Yuanjiang Dry-Hot Valley

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 146-153 Column: Public date: 2023-04-10

Title:: Characteristics of Soil Aggregates in the Preferential Flow Area and Matrix Flow Area of Typical Forest-Grassland in Yuanjiang Dry-Hot Valley

Author(s):: OUYang Tiantian¹, DUAN Xu^1,2, ZHAO Yangyi^1,2, LU Huaxing¹, ZHU Mengxue¹; (1.College of Forestry, Southwest Forestry University 650224, China; 2.Yuxi Forestry Ecosystem Research Station, National Forestry and Grassland Administration, Kunming 650224, China)

Keywords:: dry-hot valley; soil aggregates; preferential flow area; matrix flow area

CLC:: S152.7

DOI:: 10.13869/j.cnki.rswc.2023.03.014

Abstract:: [Objective]The influence of soil priority flow on the characteristics and stability of red soil aggregates in the dry and hot valley area was clarified to provide a theoretical basis for vegetation restoration and soil erosion prevention and control in this area. [Methods] Based on the dyeing tracing experiment, the soil preferential flow area and the matrix flow area were distinguished, and the characteristics of the aggregates of 0—50 cm soil layer in the two areas were analyzed by dry and wet sieving method combined with fractal theory, and the effects of the physical and chemical factors of each soil on the stability of the aggregates were characterized by the path analysis method. [Results] After dry and wet sieves, the R_0.25 aggregate contents decreased in the order: woodland priority flow area>woodland matrix flow area>barren grassland priority flow area>barren grassland matrix flow area, the change trends of average weight diameter(MWD)and geometric mean diameter(GMD)were the same as those of R_0.25_,and showed a decreasing tendency with the increase of soil depth, and the fractal dimension(D)and the agglomeration failure rate(PAD)were the opposite patterns and gradually increased with the depth of the soil layer. The physicochemical factors impacting the stability of soil aggregates in the two regions were soil bulk density and clay content, and their decision coefficients were 0.474 and-0.644, respectively. [Conclusion] The soil aggregate failure rate is higher in barren grassland, and the stability of the aggregate in the soil priority flow area is better than that in the matrix flow area. The stability of soil aggregates is mainly affected by factors such as clay content, bulk density, and organic matter.

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Last Update: 2023-04-10