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山东省禹城市耕层土壤有机质含量变化的空间变异 被引量:10
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作者 张金萍 张保华 +2 位作者 刘子亭 王振健 翟胜 《土壤通报》 CAS CSCD 北大核心 2009年第2期258-261,共4页
通过与第二次土壤普查剖面点相同位置采样、分析,运用地统计学方法,研究了禹城市耕层土壤有机质含量变化的空间分布,结果表明:研究区耕层土壤有机质含量普遍提高,增加幅度变化于-4.35gkg-1~32.53gkg-1,平均增加12.949gkg-1。土壤有机... 通过与第二次土壤普查剖面点相同位置采样、分析,运用地统计学方法,研究了禹城市耕层土壤有机质含量变化的空间分布,结果表明:研究区耕层土壤有机质含量普遍提高,增加幅度变化于-4.35gkg-1~32.53gkg-1,平均增加12.949gkg-1。土壤有机质含量变化的半变异函数可以球状、圆形、指数、高斯等模型表征,随机性因素如施肥、耕作措施、种植制度等各种人为活动是土壤耕层有机质含量变化空间分布的主要因素,土壤有机质含量增加的原因主要是秸秆还田面积增加、大量氮肥的使用;而增加幅度小甚至为负值的剖面主要是由潮湿变干燥、林地转为耕地所导致。 展开更多
关键词 禹城市 有机质含量变化 空间分布
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Study of elastic-plastic damage model of cement consolidated soil with high organic content
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作者 CHEN Huie WANG Qing CAI Keyi 《Global Geology》 2009年第1期17-21,共5页
On the basis of elastic-plastic damage model of cement consolidated soil,the authors took organic contents into reasonable damage variable evolution equation in order to seek relation between the organic contents and ... On the basis of elastic-plastic damage model of cement consolidated soil,the authors took organic contents into reasonable damage variable evolution equation in order to seek relation between the organic contents and parameters in the equation,and established the elastic-plastic damage model of cement consolidated soil considering organic contents.The results show that the parameters change correspondingly with difference of the organic contents.The higher the organic contents are,the less the valves of the parameters such as elastic modulus(E),material parameters(K,n) and damage evolution parameter(ε) become,but the larger strain damage threshold value(εd) of the sample is.Meanwhile,the calculation results obtained from established model are compared with the test data in the condition of common indoors test,which is testified with reliability. 展开更多
关键词 cement consolidated soil organic content elastic-plastic damage model
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