北京师范大学学报（自然科学版）2016，Vol.52Issue(3)：356-361,6.DOI:10.16360/j.cnki.jbnuns.2016.03.017
青海湖流域典型生态系统土壤水分对降水脉动的响应
Response of soil moisture to precipitation pulse in typical ecosystems in Qinghai Lake Watershed
摘要
Abstract
Soil moisture is a key factor affecting growth and spatial distribution of vegetation in arid and semi-arid regions,and it determines stability of entire ecosystems.Continuous measurements of precipitation and soil moisture in three typical ecosystems (grassland,shrub,and farmland)in Qinghai Lake Watershed were used to analyze response of soil moisture to precipitation pulse on different temporal scales (monthly, daily,10 minute).It was found that response of deeper soil moisture (60,90 cm)to precipitation was about one month later than shallower layer (10,30 cm).The responding depth of soil moisture to precipitation for shrub was concentrated above 60 cm,while change of deeper soil moisture was mainly affected by groundwater. Due to canopy interception,replenishment of a single small precipitation to soil moisture was very limited.The responding depth of soil moisture to precipitation for grassland was concentrated from 10 cm and 30 cm.The effected depth of farmland by precipitation pulse was less than 30 cm,responding time of grassland is significantly later than that of grassland.关键词
土壤水分/降水脉动/多尺度/生态系统/青海湖流域Key words
soil moisture/precipitation pulse/multi-scales/ecosystem/Qinghai Lake Watershed分类
农业科技引用本文复制引用
马育军,李小雁..青海湖流域典型生态系统土壤水分对降水脉动的响应[J].北京师范大学学报（自然科学版）,2016,52(3):356-361,6.基金项目
国家自然科学基金资助项目(41301013,41130640) （41301013,41130640）
