小叶锦鸡儿灌丛下土壤水分对降雨的响应  

Responses of soil moisture under shrub Caragana microphylla to rainfall

作　　者：李衍青[1,2] 孙英杰[3] 张铜会[2] 罗为群[1] 邓艳[1] 刘新平[2] 

机构地区：[1]中国地质科学院岩溶地质研究所,广西桂林541000 [2]中国科学院寒区旱区环境与工程研究所,兰州730000 [3]中国科学院/广西壮族自治区广西植物研究所,广西桂林541000

出　　处：《生态学杂志》2013年第5期1097-1103,共7页Chinese Journal of Ecology

基　　金：中国地质科学院岩溶地质研究所所控项目(2011004;2012016);国家自然科学基金项目(40871004;40902074);"十二五"国家科技支撑计划项目(2010BAE00739-02);水利部公益性行业科研专项(201101019-2)资助

摘　　要：以科尔沁沙地主要固沙灌木小叶锦鸡儿为研究对象,在其生长季次降雨21.5mm后180h内,利用TDR和微渗仪测量小叶锦鸡儿灌丛下不同部位的土壤含水量和土壤蒸发,并计算该灌丛下不同部位储水量和水量平衡。结果表明:降雨结束后初期,灌丛枝干的茎流作用使其根部的土壤含水量明显高于其他部位;灌丛根部水分的入渗速率大于灌丛中部和灌丛外缘。因冠幅的庇荫作用,灌丛下蒸发量小于灌丛外裸露沙地。水量平衡表明:小叶锦鸡儿灌丛下降雨后前期蒸散量明显高于灌丛外裸露沙地,与灌丛下根系的分布有直接关系。Taking the soil under the main sand-fixing shrub Caragana microphylla in Horqin Sandy Land of Northwest China as test object, and by using TDR and micro-lysimeter, this paper measured the soil moisture content and soil evaporation at different positions under the shrub within 180 h after a 21.5 mm rainfall during growth season, and calculated the water storage and water balance at the different positions. During the early period of the rainfall ended, the stem- flow of the shrub made the soil moisture content in root zone being obviously higher, and the in- filtration rate in root zone was faster than that in other positions. Due to the canopy shading, the soil evaporation under the shrub was less than that in the bared sand outside the shrub. The water balance showed that in the early period after rainfall, the evapotranspiration under the shrub was obviously higher than in the bared sand outside the shrub, which had a direct correlation with the root distribution under the shrub.

关 键 词：小叶锦鸡儿 降雨 土壤水分 水量平衡 

分 类 号：S714[农业科学—林学]