有机质对青藏高原多年冻土活动层土壤持水性能的影响

发布时间：2018-04-17 03:20

本文选题：青藏高原 + 土壤水分特征曲线　；参考：《中国沙漠》2017年02期

【摘要】：土壤水分特征曲线描述土壤基质势ψ和含水量θ之间的函数关系,表征土壤的持水性能,是研究土壤水分入渗、蒸发、土壤侵蚀及溶质运移的关键。高寒气候特征使有机质在青藏高原地区大量积累,为确定多年冻土活动层土壤持水性能的影响因素,尤其是有机质的影响,在长江源北麓河地区采样分析。结果表明:相比于土壤粒度分布,容重和有机质是影响土壤持水性能的主要因素,其中高基质势下(0~-30kPa)以容重影响为主,低基质势下(-100~-1 500kPa)以有机质影响为主;有机质通过改变土壤结构和增强土壤的吸附性而影响土壤持水性能,同时影响程度取决于有机质的多少,土壤持水性与有机质含量呈正相关关系。本次研究有助于认识高寒地区土壤水文特征,对展开土壤水文过程的研究提供理论基础。
[Abstract]:The characteristic curve of soil moisture describes the functional relationship between soil substrate potential 蠄 and moisture content 胃, and characterizes the water-holding capacity of soil. It is the key to study soil moisture infiltration, evaporation, soil erosion and solute transport.The characteristics of alpine climate make organic matter accumulated in Qinghai-Xizang Plateau. In order to determine the influencing factors of soil moisture retention in permafrost active layer, especially the effect of organic matter, sampling and analysis are carried out in the northern part of the Yangtze River.The results showed that bulk density and organic matter were the main factors affecting soil water holding capacity compared with soil granularity distribution. The bulk density was dominant at high substrate potential and organic matter at low substrate potential.Soil moisture retention is affected by organic matter by changing soil structure and enhancing soil absorbability, and the degree of influence depends on the amount of organic matter, and soil water holding capacity is positively correlated with organic matter content.This study is helpful to understand the characteristics of soil hydrology in alpine regions and provide a theoretical basis for the study of soil hydrological processes.
【作者单位】：兰州大学资源环境学院;中国科学院西北生态环境资源研究院冻土工程国家重点实验室;
【基金】：冻土工程国家重点实验室开放基金项目(SKLFSE201501) 国家自然科学基金项目(41271092)
【分类号】：S152.7

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