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当前位置: 首页 > 文章 > 差巴嘎蒿灌丛土壤和根系含水量对降雨的响应 生态学杂志 2008,27 (2) 151-156
Position: Home > Articles > Spatiotemporal variation of soil moisture and its relations with Artemisia halodendron root water content as affected by rainfall Chinese Journal of Ecology 2008,27 (2) 151-156

差巴嘎蒿灌丛土壤和根系含水量对降雨的响应

作  者：
赵玮;张铜会;刘新平;王少昆;罗亚勇
单  位：
中国科学院寒区旱区环境与工程研究所奈曼沙漠化研究站
关键词：
降雨;差巴嘎蒿;土壤水分的时空变化;根系含水量;水量平衡
摘  要：
以科尔沁沙地半固定沙丘灌木差巴嘎蒿(Artemisia halodendron)为对象,用土钻取样法和壕沟法研究了2006年生长季降雨后差巴嘎蒿周围土壤和根系含水量的时空分布特征及其相互关系,并计算了该灌丛的水量平衡。结果表明:该灌丛在降雨后对水分有暂时存储作用;降雨结束后,灌丛主干的茎流作用使得灌丛中心位置的土壤含水量高于灌丛丛幅垂直投影1/4和3/4处的土壤含水量;雨后6h灌丛根系含水量与灌丛中心位置的土壤含水量呈极显著的负相关(r=-0.89,P<0.01);灌丛根系含水量在雨后126h内出现胁迫脉冲间歇反应。水量平衡计算表明,灌丛边缘外1m处土壤蒸散量高于灌丛覆盖区的蒸散量,灌丛覆盖可降低土壤水分蒸散速率。
译  名：
Spatiotemporal variation of soil moisture and its relations with Artemisia halodendron root water content as affected by rainfall
作  者：
ZHAO Wei1,2,ZHANG Tong-hui1,LIU Xin-ping1,2,WANG Shao-kun1,2,LUO Ya-yong1,2(1Naiman Desertification Research Station,Cold and Arid Regions Environment and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China;2Graduate University of Chinese Academy of Sciences,Beijing 100039)
关键词：
precipitation;Artemisia halodendron;spatiotemporal variation of soil moisture;root water content;water balance
摘  要：
By the methods of soil coring and trenching,this paper studied the spatiotemporal variation of soil moisture around the roots of Artemisia halodendron,a native shrub mainly growing on the semi-fixed sand dunes in Horqin sandy land,before and after rainfall during the growth season of 2006,as well as the relationships between the soil moisture content and the water content of A.halodendron roots.The water balance was also calculated.The results showed that A.halodendron played a temporary storage role after rainfall.Under the action of main stem flow,the soil moisture content at the center of the shrub cluster was much higher than that at the places out of the center.6 hours after rainfall,the correlation coefficient between the soil moisture content at the center of the shrub cluster and the water content of A.halodendron roots was-0.89(P<0.01);and 126 hours after rainfall,the water content of A.halodendron roots showed a stress-pulse batch reaction.The soil evapotranspiration rate under the shrub cluster was lower than that at the place 1 m away from the edge of the shrub cluster,suggesting that A.halodendron cover decreased soil evapotranspiration rate.

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