论文部分内容阅读
研究不同土地利用类型土壤分形特征,以期为沙地土壤风蚀的防治和生态建设提供理论指导。该文研究了毛乌素沙地7个典型样地的土壤分形维数,以及分形维数与土壤机械组成、土地利用类型、采样深度的关系。结果表明:(1)决定沙地土壤分形维数的主要是粉沙、极细沙和细沙的百分含量;粉沙与极细沙的百分含量和土壤分形维数呈极显著正相关关系,而细沙百分含量和土壤分形维数呈极显著负相关关系。(2)7种不同利用类型土地的土壤分形维数最大值为2.51,最小值为1.59;表层(0-10 cm)土壤的平均分形维数介于1.85~2.34之间,且从大到小依次为:草地>固定沙丘>半固定沙丘>耕地1>耕地2>耕地3>流动沙丘。(3)土壤分形维数在7类土地上随着采样深度有不同程度的波动,但整体上均呈线性下降趋势。
The fractal characteristics of soils under different land use types are studied to provide theoretical guidance for the prevention and control of wind erosion and ecological construction of sandy soils. This paper studied the fractal dimension of soil in seven typical plots of Mu Us sandy land, and the relationship between fractal dimension and soil mechanical composition, land use type and sampling depth. The results showed that: (1) The fractal dimension of sandy soils was mainly determined as the percentage of silt, fine sand and fine sand. The percentage of silt and silty sand was positively correlated with soil fractal dimension While the percentage of fine sand and soil fractal dimension showed extremely significant negative correlation. (2) The maximum values of soil fractal dimension for the seven different types of land use are 2.51 and the minimum value is 1.59. The average fractal dimension of surface soil (0-10 cm) is between 1.85 and 2.34, Followed by: grassland> fixed dune> semi-fixed dune> arable land 1> arable land 2> arable land 3> mobile sand dune. (3) The fractal dimension of soil in the seven types of land with different degrees of fluctuation with the sampling depth, but on the whole showed a linear downward trend.