Influence of organic matter on rheological properties of soil
Influence of organic matter on rheological properties of soil
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DOI：
10.1016/j.clay.2011.04.009
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发表时间：
2012-08-01
影响因子：
5.6
通讯作者：
Horn, Rainer
中科院分区：
文献类型：
--
作者：
Markgraf, Wibke;Watts, Chris W.;Horn, Rainer
近年来，流变学方法已被用于研究土的微观结构的力学特性。流变学技术提供了许多定量的物理测量，并提供了一个更好的了解如何土壤微观结构的行为时，受到应力。在这里，一个旋转流变仪与平行板测量装置被用来探索土壤的粘弹性作为土壤有机碳（SOC）的函数。我们使用的样本从长期的实验地点在Broadbalk，Rothamsted，英国。从振幅扫描测试（AST）与控制剪切变形的数据报告以及矿物学数据。一般来说，水含量和SOC含量，以及土壤质地、粘土矿物学、碳酸盐和阳离子都对刚度、结构稳定性和剪切行为有影响。储能模量G '和损耗模量G "、屈服点、线性粘弹性范围（LVE）、损耗因子tan δ和积分z表征颗粒到颗粒尺度上的土壤的微观结构性质。长期施用农家肥（FYM）导致土壤有机碳（SOC）显著增加，与以无机氮磷钾肥料形式施用硝酸铵和裸地相比。对于潮湿的土壤，增加SOC提供了更大的抗变形性和改善土壤弹性性能，允许更大的变形之前达到屈服点。然而，在较干燥的土壤中（-6和-15 kPa），这种关系不太清楚。(C)2011 Elsevier B.V.保留所有权利。
Recently rheological methods have been used to investigate the mechanical properties of soil micro-structure. Rheological techniques provide a number of quantitative physically based measurements and offer a better understanding of how soil micro-structure behaves when subject to stress. Here a rotational rheometer with a parallel-plate measuring device was used to explore the viscoelastic properties of soil as a function of soil organic carbon (SOC). We used samples from the long-term experimental site at Broadbalk, Rothamsted, UK. Data from amplitude sweep tests (AST) with controlled shear deformation are reported as well as mineralogical data. In general, water content, and SOC content, in addition to soil texture, clay mineralogy, carbonate, and cations all have an effect on stiffness, structural stability, and shear behavior. Storage modulus G' and loss modulus G '', yield point, the linear viscoelastic range (LVE), loss factor tan delta, and integral z characterize micro-structural properties of soil on the particle-to-particle scale. Long-term applications of farmyard manure (FYM) lead to a significant increase in soil organic carbon (SOC), in comparison with the application of ammonium nitrate in form of mineral NPK fertilizer and bare fallow. For wet soils, increased SOC provided greater resistance to deformation and improved soil elastic properties allowing greater deformation before a yield point was reached. In drier soils however, (-6 and -15 kPa) this relationship was less clear. (C) 2011 Elsevier B.V. All rights reserved.