基于稳定同位素的长江下游竹林小流域产流机制探究  

Investigation of Runoff Generation Mechanism of Bamboo Watershed in the Lower Reaches of the Yangtze River Based on Stable Isotopes

作　　者：尚艳丽 瞿思敏[2] 勾建峰 徐瑶 游洋[4] 石朋[2,5] 张旭旻 谢永玉 SHANG Yan-li;QU Si-min;GOU Jian-feng;XU Yao;YOU Yang;SHI Peng;ZHANG Xu-min;XIE Yong-yu(Tai’an Hydrology Bureau in Shandong Province,Tai’an 271000,China;College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China;Water Science and Education Center of Jiangsu Province,Nanjing 210003,China;Water Resources Department of Jiangsu Province,Nanjing 210029,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]山东省泰安市水文局,山东泰安271000 [2]河海大学水文水资源学院,江苏南京210098 [3]江苏省水利科教中心,江苏南京210003 [4]江苏省水利厅,江苏南京210029 [5]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098

出　　处：《水电能源科学》2021年第10期35-38,共4页Water Resources and Power

基　　金：国家重点研发计划(2019YFC0409000);国家自然科学基金项目(41371048);中央高校基本科研业务费(B200205027)。

摘　　要：为探究不同水源同位素对梅雨的响应,以长江下游的和睦桥流域为例,分析2016~2019年4场梅雨降水事件的林外降水、林内降水、河水、地表水及不同深度的土壤水采样,发现降水的空间分布不均,导致林内降水同位素比林外降水同位素贫化;随着土壤深度的增加,土壤水同位素组成更接近大气水线,且时程波动更小;土壤孔隙及毛竹根系的分布导致不同深度土壤水同位素对于降水的响应存在明显的不同,其中中层土壤水同位素变化对于降水更敏感;贫化的降水降落在流域,出口断面河水同位素却出现富集现象,这说明该流域梅雨事件中河水主要来源于基流,降水对于河流的补给很小。In order to explore the response of isotopic compositions in different water sources to the Meiyu events,we analyzed the temporal variation of isotopes compositions in various water sources,including streamflow,precipitation,throughfall,surface water and soil water at different depths in Hemuqiao watershed during Meiyu events from 2016 to 2019.The spatial heterogeneity of precipitation may be the primary factor leading to more depleted isotopes in throughfall than that in precipitation.With the increase of soil depth,the isotopic composition of soil water is closer to the atmospheric water line,and the temporal fluctuation is smaller during each Meiyu event.The distribution of soil pores and the root system of bamboo leads to significant differences in the response of soil water isotopes in different layers to precipitation,and the temporal variations in soil water isotopes in the middle layer are more sensitive to precipitation.The depleted precipitation falling in the watershed results in more enriched isotopes compositions in streamflow,which indicating that the streamflow mainly come from the base flow rather than precipitation.

关 键 词：稳定同位素 产流机制 水源 竹林流域 梅雨 

分 类 号：P333[天文地球—水文科学]