文献类型：期刊文献

中文题名：汤浦水库湿地森林区大气降水氢氧同位素特征及水汽来源

英文题名：Composition of Hydrogen and Oxygen Isotope in Precipitation and Source Apportionment of Water Vapor in the Wetland Forest Area of Tangpu Reservoir,Zhejiang Province

作者：马迎宾[1,2] 徐庆[1] 高德强[1] 张蓓蓓[1]

第一作者：马迎宾

机构：[1]中国林业科学研究院森林生态环境与保护研究所;[2]中国林业科学研究院沙漠林业实验中心

年份：2018

卷号：31

期号：3

起止页码：37-44

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：林业公益行业专项(201504423);国家自然基金(31670720;31170661)

语种：中文

中文关键词：大气降水;水汽来源;降水量效应;氢氧稳定同位素;汤浦水库湿地森林区

外文关键词：meteoric water;water source;precipitation effect;stable hydrogen and oxygen isotopes;wetland forestarea of Tangpu reservoir

分类号：P426.6

摘要：[目的]研究汤浦水库湿地森林区大气降水中的氢氧稳定同位素特征及水汽来源,为定量阐明降水在会稽山-汤浦水库过渡带湿地森林生态系统水文循环过程中的分配和转化规律及绍兴饮水源水质的保护和管理提供科学依据。[方法]采集2015年7月至2017年7月2个水文年166个大气降水样品,利用稳定同位素技术,分析降水氢氧同位素组成,并阐明其与环境因子(温度、降水量)的关系;采用HYSPLIT模型中的后向轨迹法模拟追踪该地区降水气团的运输过程,判断气团的运移轨迹和水汽来源。[结果]汤浦水库湿地森林区大气降水δD与δ18O关系式:δD=8.36δ18O+14.92(R2=0.966,n=166,P<0.01);大气降水中的δD值变化范围-147.52‰~2.71‰,均值-38.13‰±27.61‰;δ18O值变化范围-19.05‰-1.17‰,均值-6.34‰±3.24‰,且不同季节的大气降水氢氧同位素值明显不同;过量氘(d值)(12.61‰)高于全球d值的均值(10‰),呈现干季高湿季低的现象;大气降水δD、δ18O温度效应不显著,但降水量效应显著。[结论]汤浦水库湿地森林区大气降水线与全球及我国大气降水线有差异,降水中的δD、δ18O值有明显的季节变化;根据大气降水中的δD、δ18O值、d值及后向轨迹法模拟结果得出,汤浦水库湿地森林区干季(10月—次年4月)大气降水的水汽主要来源于内陆地区,湿季(5月—9月)的水汽主要来源于西太平洋和印度洋。
[Objective]To study the characteristics of hydrogen and oxygen stable isotope in precipitation and the source of regional atmospheric precipitation in wetland forest area of Tangpu reservoir and to provide reference information for water resource conservation and management by clarifying quantitatively the distribution and transformation of precipitation in the process of hydrologic cycle in the forest ecosystem of the Kuaijishan-Tangpu reservoir transition zone. [Method]In this study,the data of hydrogen-oxygen isotope in 166 atmospheric precipitation samples obtained from July 2015 to July 2017 in the Tangpu reservoir wetland forest were analyzed by using isotope technology to examine the composition of hydrogen and oxygen stable isotope and to clarify the relationship between thecomposition and environmental factors（precipitation and temperature）. The source and migration path of water vapor were determined by simulating the air mass transmission pathway based on backward trajectory method of the HYSPLIT model. [Result]The relational expression of δD and δ18 O in atmospheric precipitation in the wetland forest area of Tangpu reservoir was δD = 8. 36δ18 O ＋ 14. 92（R2= 0. 966,n = 166,P 0. 01）; the value of δD in precipitation ranged from-147. 52‰ to 2. 71‰,with the average value was-38. 13‰ ± 27. 61‰; the value of δ18 O ranged from-19. 05‰ to-1. 17‰,with the average value was-6. 34‰ ± 3. 24‰,and the values changed significantly among seasons. The value of excess deuterium（12. 61‰） was higher than the global average（10‰）,and a seasonal pattern of excess deuterium in atmospheric precipitation with low value in wet season and high value in dry season was found. The ＂temperature effect＂was not obvious whereas the ＂precipitation effect＂existed significantly. [Conclusion] The meteoric water line of the wetland forest is different from the global meteoric water line and China meteoric water line,The values of δD and δ18 O in atmospheric precipitation follows obvious seasonal variation in this area. The seasonal change of the water vapor sources of atmospheric precipitation is obvious. It is concluded that the meteoric water vapor is mainly from the inland areas in dry season（from October to April of the following year）,while it mainly comes from the western Pacific and the Indian Ocean in wet season（from May to September） according to hydrogen and oxygen isotopic value in precipitation,excess deuterium,and the results of trajectory simulation.