北京山区林地土壤水分动态变化  

Soil Water Dynamics of Four Advantage Forest in Beijing Mountain Area

作　　者：王贺年[1] 余新晓[1] 李轶涛[1] 

机构地区：[1]北京林业大学,水土保持与荒漠化防治教育部重点实验室,北京100083

出　　处：《山地学报》2011年第6期701-706,共6页Mountain Research

基　　金：国家科技支撑项目“海河上游水源涵养林体系构建技术研究与示范”(2011BAD38B05);国家林业公益性行业科研专项经费项目“典型森林植被对水资源形成过程的调控研究”(201104005)~~

摘　　要：应用时域反射仪(TDR)土壤水分定位监测方法,研究了北京山区4种主要林分(侧柏、油松、刺槐、栓皮栎)林地土壤水分动态。结果表明:林地土壤水分变化既有明显的季节特征,可以分为稳定期(11—4月)、消耗期(5—6月)、积累期(7—8月)、消退期(9—10月)4个阶段。其垂直变化呈现出先增加后减少(或趋于平缓)的趋势。单次降雨后持续干旱条件下,土壤水分及其损失率与雨后干旱天数均存在二次函数关系。无论是降水还是其后的持续干旱,主要影响的都是表层土壤。The soil water dynamics of four main mountain forests in Beijing （Platycladus, Pinus tabulaeformis, Robinia pseudoacacia, and Quercus variabilis） was studied by using Time Domain Reflectometry （TDR）. The results showed that： There was a significant variation in soil water storage; it can be divided into stable period （ November - April）, consumed period （ May - June）, accumulated period （ July - August）, and subsided period （ September - October）. After rain and persistent drought conditions, soil water and its loss rate had a quadratic function with drought duration days. Both precipitation and subsequent continuing drought most effected surface soil.

关 键 词：北京山区 林地 土壤含水量 动态变化 

分 类 号：S152.7[农业科学—土壤学]