利用现有的数据,分析蚯蚓密度与土壤物理肥力主要参数之间的关系,定量评价蚯蚓对土壤物理性状的影响。通过中国知网和Web of Science,输入关键词(蚯蚓、土壤容重、土壤含水量、土壤质地、土壤孔隙度、土壤水稳定性团聚体)搜索,提取其中...利用现有的数据,分析蚯蚓密度与土壤物理肥力主要参数之间的关系,定量评价蚯蚓对土壤物理性状的影响。通过中国知网和Web of Science,输入关键词(蚯蚓、土壤容重、土壤含水量、土壤质地、土壤孔隙度、土壤水稳定性团聚体)搜索,提取其中相关的数据,将文献提取的数据与调研获得的数据结合,进行Pearson相关性分析。研究发现,蚯蚓密度与砂粒相对含量呈极显著的负指数关系(P<0.001),与粉粒相对含量呈显著的正指数关系(P<0.05),而与黏粒相对含量呈极显著的幂函数关系(P<0.001);与土壤容重呈微弱的负相关关系(P<0.20),但与土壤孔隙度呈显著的正相关关系(P<0.05);与水稳定性团聚体含量呈微弱的正相关关系(P<0.5),但与水分含量呈极显著的正相关关系(P<0.001)。基于蚯蚓密度与砂粒、粉粒、黏粒相对含量,土壤容重、孔隙度,水稳定性团聚体、水分含量关系,可以将蚯蚓密度与土壤物理肥力主要参数之间的定量关系分为5个等级,以用于评价蚯蚓对土壤物理肥力指标的影响。展开更多
This paper presents an experimental and analytical investigation of the influence of variables related to soil weathering on the geomechanical performance of sand-silt mixtures containing lateritic soils,i.e.intensely...This paper presents an experimental and analytical investigation of the influence of variables related to soil weathering on the geomechanical performance of sand-silt mixtures containing lateritic soils,i.e.intensely weathered tropical soils with the influence of interparticle bonding.The sand-silt mixtures containing different relative proportions between uniform sand and lateritic soil were produced,and geomechanical soil characterization tests were performed.Based on the results,a transition from a primarily coarse-to a fine-grained prevailing soil structure was found to cause considerable impact on the geomechanical performance of these soils,as evidenced by design variables related to soil mineralogy and size distribution characteristics.Specifically,fines contents of both individual soil particles and soil aggregations were found to correlate with experimental results,while the relative proportion between sesquioxides(aluminum,and iron oxides),and silica,i.e.sesquioxide-silica ratios(SSR^(-1)),facilitated estimates concerning changes in geomechanical performance.Finally,the application of the sandsilt mixtures containing lateritic soil on soil walls reinforced with polymeric strips was also evaluated,further emphasizing the potential advantages of adopting variables related to soil weathering on design guidelines concerning tropical soils.展开更多
文摘利用现有的数据,分析蚯蚓密度与土壤物理肥力主要参数之间的关系,定量评价蚯蚓对土壤物理性状的影响。通过中国知网和Web of Science,输入关键词(蚯蚓、土壤容重、土壤含水量、土壤质地、土壤孔隙度、土壤水稳定性团聚体)搜索,提取其中相关的数据,将文献提取的数据与调研获得的数据结合,进行Pearson相关性分析。研究发现,蚯蚓密度与砂粒相对含量呈极显著的负指数关系(P<0.001),与粉粒相对含量呈显著的正指数关系(P<0.05),而与黏粒相对含量呈极显著的幂函数关系(P<0.001);与土壤容重呈微弱的负相关关系(P<0.20),但与土壤孔隙度呈显著的正相关关系(P<0.05);与水稳定性团聚体含量呈微弱的正相关关系(P<0.5),但与水分含量呈极显著的正相关关系(P<0.001)。基于蚯蚓密度与砂粒、粉粒、黏粒相对含量,土壤容重、孔隙度,水稳定性团聚体、水分含量关系,可以将蚯蚓密度与土壤物理肥力主要参数之间的定量关系分为5个等级,以用于评价蚯蚓对土壤物理肥力指标的影响。
文摘This paper presents an experimental and analytical investigation of the influence of variables related to soil weathering on the geomechanical performance of sand-silt mixtures containing lateritic soils,i.e.intensely weathered tropical soils with the influence of interparticle bonding.The sand-silt mixtures containing different relative proportions between uniform sand and lateritic soil were produced,and geomechanical soil characterization tests were performed.Based on the results,a transition from a primarily coarse-to a fine-grained prevailing soil structure was found to cause considerable impact on the geomechanical performance of these soils,as evidenced by design variables related to soil mineralogy and size distribution characteristics.Specifically,fines contents of both individual soil particles and soil aggregations were found to correlate with experimental results,while the relative proportion between sesquioxides(aluminum,and iron oxides),and silica,i.e.sesquioxide-silica ratios(SSR^(-1)),facilitated estimates concerning changes in geomechanical performance.Finally,the application of the sandsilt mixtures containing lateritic soil on soil walls reinforced with polymeric strips was also evaluated,further emphasizing the potential advantages of adopting variables related to soil weathering on design guidelines concerning tropical soils.
