哈尼梯田水源区大气降水氢氧同位素特征及水汽来源  

Characteristics ofδD andδ^(18)O in the precipitation and evaporation sources in the water conservation area of Hani Terraces

作　　者：普慧梅 宋维峰[1] 吴锦奎 王卓娟 马菁 张小娟 PU Huimei;SONG Weifeng;WU Jinkui;WANG Zhuojuan;MA Jing;ZHANG Xiaojuan(College of Ecology and Environment,Southwest Forestry University,Kunming 650224,China;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Gansu Transportation Planning Survey and Design Institute Co.,Ltd.,Lanzhou 730030,China;School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Chongqing Yuxi Surveying and Design Institute of Water Conservancy Electric Power and Architecture,Chongqing 402160,China)

机构地区：[1]西南林业大学生态与环境学院,昆明650224 [2]中国科学院西北生态环境资源研究院,兰州730000 [3]甘肃省交通规划勘察设计院股份有限公司,兰州730030 [4]北京林业大学水土保持学院,北京100083 [5]重庆市渝西水利电力建筑勘测设计院,重庆402160

出　　处：《生态科学》2022年第2期50-58,共9页Ecological Science

基　　金：国家自然科学基金项目(41371066,41771084);云南省自然科学基金重点项目(202001AS070042)。

摘　　要：基于哈尼梯田水源区2014年6—8月和2015年全年(共15个月)采集的89个事件降水同位素数据,结合相关气象资料,分析了降水中氢氧同位素组成的变化及其影响因子。利用后向轨迹模型(HYSPLIT)追踪了梯田水源区降水的水汽来源。结果表明:研究区大气降水中稳定同位素组成具有明显季节差异,湿季(5月—10月)δD和δ^(18)O贫化,d值低;干季(11月至次年4月)δD和δ^(18)O值相对偏正,d值偏高。区域降水线的斜率和截距均低于全球和中国大气降水线。降水同位素组成存在一定的降水量效应,但不存在温度效应。干季大气降水的水汽主要来源于西风带输送的印度洋水汽以及局地蒸发,湿季的水汽主要来源于西太平洋和印度洋。Based on the stable isotopes data of 89 event precipitation samples collected from June to August 2014 and the whole year 2015(15 months in total)and related meteorological statistics data in the water conservation forest area of Hani Terraces,the variation of ^(2)H and ^(18)O components in precipitation and its impact factors were analyzed.By using HYSPLIT model,the moisture sources of precipitation were tracked.The results indicated that an obvious seasonal variation of the ^(2)H and ^(18)O components in precipitation existed.The values ofδD,δ^(18)O and d were relatively more depleted or lower during the wet season(from May to October),whereas those values were relatively richer or higher during the dry season(from November to next April).The slope and intercept of the Local Meteoric Water Line(LMWL)were both lower than those of the Global Meteoric Water Line(GMWL)and the Chinese Meteoric Water Line(CMWL).The precipitation effect ofδ^(18)O in precipitation exhibited to some extent while no temperature effect existed in this area.The results from the HYSPLIT model showed that the meteoric water vapor was mainly from the Indian Ocean conveyed by the westerly and local evaporation in dry season,while was from the western Pacific and the Indian Ocean in wet season.

关 键 词：大气降水 水汽来源 氢氧稳定同位素 过量氘 哈尼梯田 

分 类 号：S715.1[农业科学—林学]