Effects of land use patterns on soil aggregate stability in Sichuan Basin, China

文献类型： 外文期刊

第一作者： Zhang, Zhen

作者： Zhang, Zhen;Wei, Chaofu;Xie, Deti;Gao, Ming;Zeng, Xibai

作者机构：

关键词： aggregate size distribution;soil aggregate stability;fractal dimension;land use pattern;purple soil;Sichuan Basin;China

期刊名称：PARTICUOLOGY （ 影响因子：3.067； 五年影响因子：3.387 ）

ISSN： 1674-2001

年卷期： 2008 年 6 卷 3 期

页码：

收录情况： SCI

摘要： Soil aggregate stability as a key indicator of soil structure, is a product of interactions between soil environment, management practices, and land use patterns. The objective of this study was to analyze the impact of various land use patterns on soil aggregate stability in Sichuan Basin of Southwestern China. The dry- and water-stable aggregate size distributions were determined by manual dry sieving procedure and Yoder's wet sieving procedure, respectively, while microaggregates and its mechanical and chemical stabilities by Kachisky's method, oscillator method, and citrate-dithionate (C-D) reagent method, separately. The results indicated that fractal dimension and surface fractal dimension were useful indicators to reflect soil aggregate distribution. Land use patterns have an obvious influence on soil aggregate stability. In the study area, water stability, mechanical stability, and chemical stability followed the sequence, Barren land > forestland > orchard > cropland, and the original stability and collapse velocity were sensitive to soil properties and soil structure. The difference of aggregate stability under different land use patterns is mainly due to the intensity of human disturbance and cultivation. Improper land use patterns will lead to breakdown of unstable aggregates, producing finer and more-easily transportable particles and microaggregates. In the future, inappropriate cultivation and land use patterns should be changed to protect soil structure, to improve soil aggregate stability and soil fertility in Sichuan Basin. (c) 2008 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

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