• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Soil Research >Cation ratio of soil structural stability (CROSS)
【24h】

Cation ratio of soil structural stability (CROSS)

机译：土壤结构稳定性的阳离子比（CROSS）

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Sodium salts tend to dominate salt-affected soils and groundwater in Australia; therefore, sodium adsorption ratio (SAR) is used to parameterise soil sodicity and the effects of sodium on soil structure. However, some natural soils in Australia, and others irrigated with recycled water, have elevated concentrations of potassium and/or magnesium. Therefore, there is a need to derive and define a new ratio including these cations in place of SAR, which will indicate the dispersive effects of Na and K on clay dispersion, and Ca and Mg on flocculation. Based on the differential dispersive effects Na and K and the differential flocculation powers of Ca and Mg, we propose the concept of 'cation ratio of soil structural stability' (CROSS), analogous to SAR. This paper also gives the results of a preliminary experiment conducted on three soils varying in soil texture on hydraulic conductivity using percolating waters containing different proportions of the cations Ca, Mg, K, and Na. The relative changes in hydraulic conductivity of these soils, compared with the control treatment using CaCl2 solution, was highly correlated with CROSS. Clay dispersion in 29 soils treated with irrigation waters of varying cationic composition was highly correlated with CROSS rather than SAR. It was also found that CROSS measured in 1 : 5 soil/water extracts was strongly related to the ratio of exchangeable cations. These results encourage further study to investigate the use of CROSS as an index of soil structural stability in soils with different electrolytes, organic matter, mineralogy, and pH.
机译：在澳大利亚，钠盐往往在受盐影响的土壤和地下水中占主导地位。因此，钠吸附率（SAR）可用于参数化土壤的碱度以及钠对土壤结构的影响。但是，澳大利亚的某些天然土壤以及其他使用循环水灌溉的土壤中钾和/或镁的浓度较高。因此，需要推导并定义一个新的比率，包括取代SAR的这些阳离子，这将表明Na和K对粘土分散的分散作用，以及Ca和Mg对絮凝的分散作用。基于Na和K的微分分散作用以及Ca和Mg的微分絮凝能力，我们提出了类似于SAR的“土壤结构稳定性阳离子比”（CROSS）的概念。本文还给出了使用含有不同比例的阳离子Ca，Mg，K和Na的渗滤水对三种土壤质地，水力传导率进行了初步实验的结果。与使用CaCl2溶液的对照处理相比，这些土壤的水力传导率的相对变化与CROSS高度相关。阳离子组成不同的灌溉水处理过的29种土壤中的粘土分散与CROSS而非SAR高度相关。还发现在1：5的土壤/水提取物中测得的CROSS与可交换阳离子的比例密切相关。这些结果鼓励进行进一步的研究，以研究使用CROSS作为具有不同电解质，有机物，矿物学和pH值的土壤中土壤结构稳定性的指标。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号