[1]Du Dandan,Gao Ruizhong,Jia Debin.Analysis of Fractal Characteristics and Spatial Variability of Soil Particles in the Jilantai Salt Lake Basin[J].Research of Soil and Water Conservation,2023,30(06):93-101.[doi:10.13869/j.cnki.rswc.2023.06.045]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 06
Page number:
93-101
Column:
Public date:
2023-10-10
- Title:
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Analysis of Fractal Characteristics and Spatial Variability of Soil Particles in the Jilantai Salt Lake Basin
- Author(s):
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Du Dandan1,2, Gao Ruizhong1,2, Jia Debin1,2
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(1.Institute of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China; 2.Inner Mongolia Key Laboratory of Water Resources Protection and Utilization, Hohhot 010018, China)
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- Keywords:
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fractal dimension; spatial variation; physical and chemical properties of soil; Jilantai Salt Lake Basin
- CLC:
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S152.3
- DOI:
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10.13869/j.cnki.rswc.2023.06.045
- Abstract:
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[Objective] The objective of this study is to clarify the fractal characteristics and spatial variation characteristics of soil particles in the salt lake basin, reveal the response laws of regional soil environment evolution and impact factors, and provide data and theoretical support for the control of sand damage in the salt lake basin in the arid area. [Methods] Jilantai Salt Lake Basin was selected as the research area. 50 soil sampling points were set in this basin. 150 soil samples were obtained from 3 layers every 50 cm. According to the soil particle size distribution as well as the basic soil physical and chemical index including pH, total soluble solid(TDS), total nitrogen(TN), and water accommodated fraction(θ), the soil fractal dimension, the content of each particle fraction and the soil physicochemical index were measured and analyzed through a multi-factor correlation analysis method. A geostatistics method was applied to the study spatial variation characteristics and distribution rules of soil profile fractal dimensions. [Results] The soil texture of 0—100 cm in the study area is mainly sandy soil and loamy sandy soil, and the soil texture types at different soil depths are basically the same. The fractal dimension of soil(D value)particles in the study area is between 1.672 and 2.785. The D value of soil fractal dimension is significantly positively correlated with clay and silt, and negatively correlated with coarse, medium and fine sand. D value rises with the increase of soil particle content smaller than 0.1 mm particle size and declines with the uplift of soil particle content larger than 0.1 mm particle size. 0.1 mm particle size is the boundary value of D value changing with soil particle size. D value is positively correlated with θ and NT in 3 soil layers, but not significant with pH and TDS. A strong spatial autocorrelation has been shown in the D value of soil fractal dimension. The fractal dimension of soil is strongly spatial self-correlated, the D value of each layer of soil presents a bar-like mosaic distribution characteristic gradually increasing from south to north. D values of the Bayin Ula Mountains and Ulanbuh Desert areas in the north of the basin reach the peak, while D values of the Tugrigol Ditch Land in the southwest edge and the Helan Mountains area in the southeast edge present the lowest D values among the whole basin area. The spatial distribution of D value in surface soil layer is slightly more complicated than that in 50 cm and 100 cm depths due to the influence of human activities, and there is a zonal high value area near Jilantai Salt Lake. [Conclusion] Affected by climate and human activities, the soil texture in Jilantai Salt Lake Basin has changed, the surface soil particles have been seriously eroded by wind, and the deeper soil has been coarse-grained. In the future, the observation and research of soil erosion and degradation should be strengthened.