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[1]YANG Ting,JING Hang,YAO Xu,et al.Soil Particle Composition and Its Fractal Dimension Characteristics of Different Land Uses in Loess Hilly Region[J].Research of Soil and Water Conservation,2016,23(03):1-5,24.

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Soil Particle Composition and Its Fractal Dimension Characteristics of Different Land Uses in Loess Hilly Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 03 Page number: 1-5,24 Column: Public date: 2016-06-28

Title:: Soil Particle Composition and Its Fractal Dimension Characteristics of Different Land Uses in Loess Hilly Region

Author(s):: YANG Ting¹, JING Hang¹, YAO Xu¹, DONG Changping³, YOU Zheng¹, XUE Sha^1,2; 1. Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;
3. Chongqing Yubei District Huayingshan Forest Farm, Chongqing 401120, China

Keywords:: the loess hilly region; land use; soil particle composition; fractal dimension

CLC:: S152.3

DOI:: -

Abstract:: Taking field sampling and laboratory analysis method, using the fractal theory of particle volume, we studied soil particles and their features in profiles of four kinds of land use modes in loess hilly-gully region. The results show that the four kinds of land use modes have significant different soil physical and chemical properties, surface soil chemical properties decrease in the order: natural forest > plantation > grassland > farmland except the total phosphorus, bulk densities decrease in the order: farmland > grassland > plantation > natural forests, the difference of soil properties reduce in the layer of 50—100 cm. Coarse silt is dominant in soil, in addition to the coarse sand grains, the land uses have significant effects on the contents of the rest fractions, the hierarchy is not obvious, small fraction contents of slope farmland and grassland are higher than those of natural forests and plantations. A significantly negative correlation between organic matter, total nitrogen and the contents of clay and silt was observed, bulk densities are extremely significantly positively correlated with the contents of clay and silt; sand content is extremely significantly positively correlated with organic matter and density, is very significantly negatively correlated with bulk density. Fractal dimension of soil particles was 2.52～2.74, there is no significant difference between the level of farmland and grassland, but significantly higher than plantations and natural forests. Fractal dimension reduces with the increase of soil depth in farmland, fractal dimensions of the grass, plantations and natural forests show a trend of slow increasey. Fractal dimension is significantly positively correlated with contents of clay and silt as well as bulk density, was significantly negatively correlated with contents of sand, organic matter, total nitrogen, there was no significant correlation with the total phosphorus. To sum up, the land uses of loess hilly-gully region have the greater influence on soil particle composition, compared with sloping farmland, the particle sizes of grassland and forest land shift from the small particles to large particles.

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