黄河北岸兰州段荒漠-草原过渡带土壤粒径分形特征

作者：Fusen Nan, Zongxing Li, Xiaoping Zhang, Pengfei Liang, Xueting Xiong · 发表于：Earth Science-Journal of China University of Geosciences · 年份：2023 · DOI：10.3799/dqkx.2022.238 · 被引用次数：2 · 研究领域：Biocrusts and Microbial Ecology、Aeolian processes and effects、Soil erosion and sediment transport

The study of soil grain fractal characteristics in the desert-steppe transition zone can provide a scientific basis for regional soil quality evaluation, ecological management, and restoration.In this study, we use fractal theory to analyze the soil particle composition and fractal characteristics of three vegetation types in the desert-steppe transition zone along the northern bank of the Yellow River basin in Lanzhou.(1) The soil in the study area is mainly composed of silt and very fine sand, and as desertification degree and soil depth increase, the contents of clay and silt decrease and sand contents show the opposite trend.In addition, the frequency curve of soil particle size distribution (PSD) becomes more heterogeneous, and the homogeneity of soil texture decreases.( 2) The single fractal dimension (D v ), multifractal generalized dimension spectrum parameters (D 1 , D 1 /D 0 , and D 2 ), and the singular spectral function parameters ( △ α and △ f) decrease significantly with the increase of desertification degree and soil depth.(3) D v , D 1 , D 2 , D 1 /D 0 , △ α , and △ f are significantly positively correlated with clay and silt contents, and 基金项目： 第二次青藏高原综合科学考察研究项目专题(No. 2019QZKK0405)；