Soil Strength Characteristics Along an Arable Eroded Slope

PENG Xin-Hua; ZHANG Bin; ZHAO Qi-Guo; R. HORN

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Soil Strength Characteristics Along an Arable Eroded Slope

机译：沿坡耕地土壤强度特征

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Undisturbed soil cores were taken from different slope positions (upslope, backslope and footslope) and soil depths (0-15, 20-35 and 100-115 cm) in a soil catena derived from Quaternary red clay to determine the spatial changes in soil strength along the eroded slope and to evaluate an indicator to determine soil strength during compaction. Precompression stress, as an indicator of soil strength, significantly increased from topsoil layer to subsoil layer (P<0.05) and was affected by slope position. In the subsoil layer (20-35 cm), the precompression stress at the footslope position was significantly greater than at the backslope and upslope positions (P<0.05), while there were no significant differences at 0-15 and 100-115 cm. Precompression stress followed the spatial variation of soil clay content with soil depth and had a significant linear relationship with soil porosity (r2 = 0.40, P<0.01). Also, soil cohesion increased with increasing soil clay content.The precompression stress was significantly related to the applied stress corresponding to the highest change of pore water pressure (r2 = 0.69, P<0.01). These results suggested that soil strength induced by soil erosion and soil management varied spatially along the slope and the maximum change in pore water pressure during compaction could be an easy indicator to describe soil strength.

机译：在第四纪红黏土衍生的土壤链中，从不同的坡度位置（上坡，后坡和山麓坡）和土壤深度（0-15、20-35和100-115 cm）获取未扰动的土壤核心，以确定土壤强度的空间变化沿着侵蚀的斜坡，并评估一个指标以确定压实过程中的土壤强度。预压应力作为土壤强度的指标，从表层土层到下层土层显着增加（P <0.05），并且受边坡位置的影响。在地下土壤层（20-35 cm）中，山坡位置的预压应力明显大于后坡和上坡位置的压应力（P <0.05），而在0-15 cm和100-115 cm处无明显差异。预压应力随土壤黏土含量随土壤深度的变化而变化，且与土壤孔隙度呈线性关系（r2 = 0.40，P <0.01）。此外，土壤黏附力随土壤黏土含量的增加而增加。预压缩应力与施加的应力显着相关，对应于最大的孔隙水压力变化（r2 = 0.69，P <0.01）。这些结果表明，由土壤侵蚀和土壤管理引起的土壤强度沿斜坡空间变化，压实过程中孔隙水压力的最大变化可能是描述土壤强度的简单指标。

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来源
《土壤圈（英文版）》 |2005年第6期|739-745|共7页
作者
PENG Xin-Hua; ZHANG Bin; ZHAO Qi-Guo; R. HORN;
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作者单位

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences,Nanjing 210008(China);

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences,Nanjing 210008(China);

Institute of Plant Nutrition and Soil Science, CAU Kiel, Olshausenstr, 40 D-24118 Kiel (Germany);

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences,Nanjing 210008(China);

Institute of Plant Nutrition and Soil Science, CAU Kiel, Olshausenstr, 40 D-24118 Kiel (Germany);

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
pore water pressure; precompression stress; soil erosion; soil strength;

机译：孔隙水压力;预压应力;土壤侵蚀;土壤强度;

Soil Strength Characteristics Along an Arable Eroded Slope

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