水土保持学报2013，Vol.27Issue(2)：244-249,6.
丹江鹦鹉沟小流域不同土地利用类型的粒径特征及土壤颗粒分形维数
Soil Particle-size Distribution and Fractal Dimension of Different Land Use Types in Yingwugou Small Watershed of Dan River
摘要
Abstract
There were 78 soil samples chosen in different profiles in Yingwugou watershed. Using fractal theory, the fractal features of soil particle-size distribution (PSD) under different types of land use, the spatial distribution of fractal dimension and the relationship between fractal dimension and soil nutrients were studied. The results indicated that: (l)The predominant soil particle sizes were found to be silt in studied area. The percentages of silt were between 45. 41% and 66. 19%. The contents of clay and gravel were relatively lower. (2) The soil fractal dimension of particle-size distribution could not be simulated by semi variance model and the Kriging simulation in small watershed. The soil fractal dimension in topsoil was largely affected by soil erosion. (3)The plots with thick soil and good conditions were often used as farmland under steep slope, causing the soil fractal dimension in the same slope to show: Farmland >woodland and grassland. (4)The fractal dimension showed distinct difference according to the content of different particle-sizes. The fractal dimension of PSD had a strong positive correlation with silt-clay content, a negative correlation with the content of fine sand, coarse sand and gravel. (5)The fractal dimensions of cropland and grassland in 0 — 10 cm came to be smaller as the slope increased, but the slope showed a small influence on the fractal dimension of forest land. (6)The fractal dimension had strong positive relationship with soil water content in the four soil layers, but negative relationship with soil organic matter in 0—10 cm soil layer.关键词
土地利用方式/分形维数/小流域/丹江Key words
land use types/ fractal dimension/ small watershed/ Dan river分类
农业科技引用本文复制引用
张秦岭,李占斌,徐国策,张铁钢,黄萍萍,张洋..丹江鹦鹉沟小流域不同土地利用类型的粒径特征及土壤颗粒分形维数[J].水土保持学报,2013,27(2):244-249,6.基金项目
国家自然科学基金项目"植被格局对坡沟水蚀过程调控机理研究"(41071182) （41071182）
博士点基金资助项目"退耕生态系统植被根系行为与土壤水环境响应"(20096118110006) （20096118110006）
国家重点基础研究发展计划"973"计划项目"黄土坡面土壤养分流失特征与控制机理"(2011CB411903) （2011CB411903）
陕西省自然科学基金项目"自然-人工植被对非点源污染过程调控机理"(2011JE008) （2011JE008）
