| 采用新电导率指标分析土壤盐分变化规律 |
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| 引用本文： | 吴月茹,王维真,王海兵,张智慧. 采用新电导率指标分析土壤盐分变化规律[J]. 土壤学报, 2011, 48(4): 869-873 |
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| 作者姓名： | 吴月茹 王维真 王海兵 张智慧 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所,兰州,730000 |
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| 基金项目： | 国家重点基础研究发展计划项目(2009CB421305); 国家自然科学基金项目(40875006)资助 |
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| 摘 要： | 土壤电导率(Electrical conductivity,EC)是限制植物和微生物活性的阈值,影响到土壤养分和污染物的转化、存在状态及有效性[1],反映了在一定水分条件下土壤盐分的实际状况,且包含了土壤水分含量及离子组成等丰富信息[2]。在一定浓度范围内,土壤溶液含盐量与电导率呈正相关,溶解的盐类越多,溶液电导率就越大,故可根据溶液电导率的大小,间接地测量土壤含盐量[3-5]。
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| 关 键 词： | 土壤盐分 土壤饱和溶液电导率 ECsat 土水比 |
| 收稿时间： | 2010-02-03 |
| 修稿时间： | 2010-06-02 |
Analysis of variation of soil salt with new electric conductivity index |
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| wuyueru,wangweizhen. Analysis of variation of soil salt with new electric conductivity index[J]. Acta Pedologica Sinica, 2011, 48(4): 869-873 |
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| Authors: | wuyueru wangweizhen |
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| Affiliation: | Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Science,Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Science |
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| Abstract: | In this paper, the electrical conductivity of the extract of a saturated soil(ECsat) which is a new easily measurable and practical index of soil salinity, was adopted to study the seasonal variation of soil salinity. ECsat was defined as , when . Where EC1:x is the electrical conductivity of the extract of a soil sample at 1:x soil-water ratio, is the density of soil particles and is the density of water. Soil sample with different soil-water ratio were prepared and their electrical conductivity were measured, then computed the values through data fitting and regression analysis. The is not equal to the traditional index, the electrical conductivity of the extract of a saturated soil-paste prepared by the standard procedure(ECe), but also have almost the same physical meaning of ECe. The study result show that soil salt accumulat dramatically on soil surface, and decrease with depth. And, in spring and summer, sail salt content is relatively high then the value in autumn. Except that, the salinization phenomenon exists in soil profile with varying degrees, the extent of upper layer is great than lower layer, and salinization phenomenon always exists in soil surface layer and very serious. |
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| Keywords: | Soil salt Electrical conductivity of saturated soil solution ECsat The quality ratio of soil to water. |
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