Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology
National Natural Science Foundation of China (41907011); Key Field Innovation Project of Guangxi Society of Soil and Water Conservation (202009003)
The aim of this study was to analyze the distribution of soil particle size in the context of different land use patterns on the Longji terrace and to provide a reference basis for forest water conservation and paddy field farming management. Taking bamboo forest, Chinese fir forest, mixed forest and paddy field as the research objects, the soil particle size and physical properties were measured. The fractal parameters of soil particle size were also calculated. The influence of land use patterns on the fractal characteristics of soil particle size was examined based on principal component analysis, correlation analysis and stepwise regression analysis. The results showed that the clay content in Chinese fir forest and the sand content in bamboo forest were the highest. The soil particle size from different land use patterns was mainly 2 ~ 200 μm, representing approximately 79.4% of samples. The values for volume dimension D(0), information dimension D(1) and correlation dimension D(2) were Chinese fir forest > mixed forest > paddy field > bamboo forest. The values for information dimension/volume dimension D(1)/D(0) and single fractal dimension D were Chinese fir forest > bamboo forest > paddy field > mixed forest. The spectral width ?? and symmetry degree ?f of the singular spectral function were the largest for mixed forests and the smallest for paddy field. D was the most closely related to the soil clay content (P<0.01). D(0), D(1)/D(0) and ?f were the most closely related to the soil silt content (P<0.05). Land use patterns could change the fractal parameters by affecting the soil mechanical composition. The values of D, D(0), D(1), D(2), D(1)/D(0), and the soil clay content of Chinese fir forest were the largest.