摘要
运用18O稳定同位素,示踪了黑河中游河岸柽柳林2009年6月与8月两个时期的水分来源,分析了其水分利用模式。结果表明:柽柳茎干水两期的δ18O值分别为-8.32‰、-10.41‰,具有明显的差异,6月柽柳主要利用40~60cm土壤水分,而在8月则主要利用60cm以下深层土壤水或地下水;两个时期柽柳的水分初始来源均主要为地下水,不直接利用当地夏季降雨与河水,河岸柽柳之所以形成这种水分利用策略,与研究区气候干旱且存在强烈的河水-地下水相互作用密切相关。
By means of 18O stable isotope analysis, we studied the water sources and their seasonal （June and August） utilization dynamics of Tamarix growing in the riparian of middle reaches of Heihe river. The results show that there existed obvious variations in water stable isotope composition in branches of Tamarix, the δ18O in June and August were - 8.32‰ and - 10.41‰ respectively ; In June, the water was utilized mainly from 40 60cm soil layer, while in August, Tamarix obtained water from soil layer about 60cm or even much deeper. The water utilization source for Tamarix was from ground water, and did not absorb rain water or river water directly. The reason why the riparian Tamarix formed such water utilization strategy was closely related to the arid climate and the interaction of stream - groundwater.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2014年第7期150-155,共6页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(40702042)
中央高校基本科研业务费专项资金资助
关键词
水分来源18O同位素
柽柳
河岸带
黑河中游
water source of 18O stable isotope
Tamarix
riparian
middle reaches of Heihe River
