Abstract:
This paper takes Mayi Lake as the research object; based on the data of soil particle size distribution in the lake’s different areas and different soil depths, the relationship between soil particle size and fractal dimension, and the change characteristics of soil fractal dimension in excessive salinization were analyzed by single fractal method. The results show that: ① In Mayi Lake regions, the main component of soil particles is silt; the soil texture types are mainly silt loam, silt, sand and sandy loam; and the fractal dimension
D value of soil is between 1.79 and 2.71. Horizontally, the fractal dimension of soil shows an east-west-straight-line-decrease trend, and a south-north trend that first increases and then decreases; and vertically, from the surface layer (0—20 cm) to the bottom layer (60—80 cm), the fractal dimension of soil first decreases, then increases and decreases again. ② The soil in Mayi Lake regions is found to have three different salinization degrees: severe salinization accounts for the largest part, being 37.25%; and mild salinization and moderate salinization are similar, being respectively 30.28% and 31.47%. ③ The fractal dimension of soil can be used as the index of soil salinization in the lake regions. When the
D value is over 2.28, the soil demonstrates moderate salinization, and when the
D value is over 2.38, the soil demonstrates severe salinization. Mayi Lake is the water source of ecological barrier in the eastern part of Kelamayi City. The ecological environment of the lake regions is related to the ecological security of the main urban area of Kelamayi City. Studying the change characteristics of fractal dimension of soil particle size in the process of soil salinization in the lake regions can provide scientific guidance for the control of soil salinization in the lake regions.