Luo Bang-lin, Chen Xiao-yan, Ding Lin-qiao, Huang Yu-han, Zhou Ji, Yang Tian-tian
College of Resources and Environment/Key Laboratory of Eco-environment in Three Gorges Region (Ministry of Education), Southwest University, Chongqing, China.
State Key Lab of Urban and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
PLoS One. 2015 Apr 9;10(4):e0122842. doi: 10.1371/journal.pone.0122842. eCollection 2015.
As a fundamental characteristic of soil physical properties, the soil Particle Size Distribution (PSD) is important in the research on soil moisture migration, solution transformation, and soil erosion. In this research, the PSD characteristics with distinct methods in different land uses are analyzed. The results show that the upper bound of the volume domain of the clay domain ranges from 5.743 μm to 5.749 μm for all land-use types. For the silt domain of purple soil, the value ranges among 286.852~286.966 μm. For all purple soil land-use types, the order of the volume domain fractal dimensions is D clay<D silt<D sand. However, the values of D silt and D sand in the Pinus massoniana Lamb, Robinia pseudoacacia L and Ipomoea batatas are all higher than the corresponding values in the Citrus reticulate Blanco and Setaria viridis. Moreover, in all the land-use types, all of the parameters in volume domain fractal dimension (Dvi) are higher than the corresponding parameter values from the United States Department of Agriculture (Dvi(U)). The correlation study between the volume domain fractal dimension and the soil properties shows that the intensity of correlation to the soil texture and soil organic matter has the order as: D silt>D silt(U)>D sand (U)>D sand and D silt>D silt(U)>D sand>D sand(U), respectively. As it is compared with all Dvi, the D silt has the most significant correlativity to the soil texture and organic matter in different land uses of the typical purple soil watersheds. Therefore, Dsilt will be a potential indictor for evaluating the proportion of fine particles in the PSD, as well as a key measurement in soil quality and productivity studies.
作为土壤物理性质的一个基本特征，土壤粒径分布（PSD）在土壤水分运移、溶质转化和土壤侵蚀研究中具有重要意义。本研究分析了不同土地利用方式下采用不同方法的PSD特征。结果表明，所有土地利用类型的黏粒域体积域上限范围为5.743μm至5.749μm。紫色土粉粒域的值在286.852~286.966μm之间。对于所有紫色土土地利用类型，体积域分形维数的顺序为D黏粒<D粉粒<D砂粒。然而，马尾松、刺槐和甘薯地中粉粒和砂粒的D值均高于相应的柑橘和狗尾草中的值。此外，在所有土地利用类型中，体积域分形维数（Dvi）的所有参数均高于美国农业部相应的参数值（Dvi(U)）。体积域分形维数与土壤性质的相关性研究表明，其与土壤质地和土壤有机质的相关强度顺序分别为：D粉粒>D粉粒(U)>D砂粒(U)>D砂粒和D粉粒>D粉粒(U)>D砂粒>D砂粒(U)。与所有Dvi相比，粉粒的D值与典型紫色土流域不同土地利用方式下的土壤质地和有机质的相关性最为显著。因此，Dsilt将是评估PSD中细颗粒比例的一个潜在指标，也是土壤质量和生产力研究中的一项关键测量指标。
