陕西洛川L_1-S_8黄土和古土壤水分特征研究  

The characteristics of soil moisture of L_1-S_8 in Luochuan,Shaanxi

作　　者：王长燕[1,2] 卫旭东[1] WANG Changyan WEI Xudong(College of Geography and Environment, Baoji University of Arts and Sciences, Baoji 721013, China Key Laboratory of Disaster Monitoring and Mechanism Simulating of Shaanxi Province, Baoji 721013, China)

机构地区：[1]宝鸡文理学院地理与环境学院,陕西宝鸡721013 [2]陕西省灾害监测与机理模拟重点实验室,陕西宝鸡721013

出　　处：《西北大学学报（自然科学版）》2016年第5期759-763,共5页Journal of Northwest University（Natural Science Edition）

基　　金：陕西省教育厅重点实验室基金资助项目(2010JS072;2009JS071;2013JS011);国家自然科学基金资助项目(40672108;41371497;41171423);宝鸡文理学院重点基金资助项目(ZK1054;ZK15052)

摘　　要：分析陕西洛川L1-S8黄土和古土壤层水分特征,为研究黄土高原土壤水分运动及农业发展、生态建设提供依据。采用张力计法、环刀法等对洛川L1-S8黄土和古土壤层共16层32个原状土样进行水分特征曲线、田间持水量等的实验测定。用Van Genuchten模型对洛川L1-1-S8-2黄土和古土壤的水分特征曲线进行拟合,R2值达0.98以上,每个黄土层及其相邻下部的古土壤层的水分特征曲线相互交叉。洛川黄土层的土壤水分特征用Van Genuchten模型描述最适合;L1-L8黄土层的持水性在低吸力段强于相邻下部的S1-S8古土壤层,在较高吸力段弱于相邻下部的S1-S8古土壤层;总体上看洛川L1-S8黄土层的饱和含水量都比相邻下部的古土壤层高,稳定凋萎系数略低,最大有效水含量略高;L1-S5中黄土层的田间持水量比相邻下部的古土壤层高,L6-S8中黄土层的田间持水量比相邻下部的古土壤层略低。The paper analyzed the characteristics of soil moisture of L1-S8 in Luochuan of China, in order to supply reference for research on water moisture movement, agriculture development and ecological construction. The 32 samples were undisturbed soil samples taken by big cutting-ring. The soil-water characteristic curves were obtained by tensiometer with measuring range of 0 -85kPa, and the field capacities of samples were determined with the cutting-ring method. The results showed that the R2 values of soil-water characteristic curves of L1-1-S8-2 fitted with Van Genuchten model are all above 0.98. The soil-water characteristic curves of each loess sample and that of adjacent and lower paleosol sample cross. Van Genuchten model is the best to describe the soil-water characteristics of loess and paleosol in Luochuan. The water-preserved properties of L1- L8 are stronger in lower suction range and weaker in high suction range than that of adjacent and lower S1-S8. Compared with paleosol layers, the saturation moisture content of loess layers are greater, wilting moisture are lower, and the maximum effective water content are greater. Compared with adjacent and lower paleosol layers, the field capacities of L1-L5 are greater, and those of L6-L8 are lower.

关 键 词：陕西洛川 黄土和古土壤 水分特征曲线 

分 类 号：P641.131[天文地球—地质矿产勘探] S152.72[天文地球—地质学]