摘要
水的稳定同位素(D和O)是水文过程的重要示踪剂。本文以哈尼梯田文化景观遗产核心区全福庄河扇形小流域为研究对象,通过采集流域内雨季和旱季的大气降水样品,并测定和分析氢氧同位素值(D和δ18O),得出以下结论:(1)研究区全年大气降水线方程为:δD=8.35δ^(18)O+22.41(R2=0.98,n=48),但年内旱季和雨季降水线方程的斜率和截距差异明显。(2)研究区大气降水中氢氧稳定同位素组成具有明显季节差异,雨季降水中氢氧同位素贫化,d值偏低;旱季降水氢氧同位素值相对偏正,d值偏高,这与我国季风区旱雨季水汽来源差异有关。(3)根据相关分析可知,温度、降水和相对湿度3个要素的变化是研究区降水同位素值变化的主要影响因素,但在不同的时间尺度下影响降水同位素变化的环境因素存在差异。(4)在年尺度下降水和相对湿度是主要的影响因素;在旱雨季尺度下,温度是雨季降水同位素值变化的主要因素,而温度、降水量和相对湿度对旱季降水同位素值变化的影响则不显著,旱季降水同位素δ18O值变化为三因素共同作用的结果。
The stable isotopes of water(D and O)are important tracers for hydrological processes.In this paper it took a fan-shaped watershed of the Quanfuzhuang River located at the core zone of the cultural landscape heritage of Hani Rice Terraces in Yunnan,China as the research object,where 48 atmospheric precipitation samples in this basin were collected in rainy seasons and dry seasons separately,and then they were tested and analyzed for hydrogen and oxygen isotopes(δD andδ18 O)comparison.Conclusions were drawn:(1)The meteoric water line equation for a year was:δD=8.35δ18 O+22.41(R 2=0.98,n=48),and graphically the slopes and intercepts of the equation for dry season were quite different from those for rainy season.(2)There was an obvious seasonal variation in the composition of precipitation hydrogen and oxygen stable isotope.During the rainy season they were lean with low d values,whereas in the dry seasons they were relatively positive with higher d values,suggesting that the differences were ascribable to the seasonal changes in the moisture sources of China monsoon regions.(3)Correlation analysis revealed that temperature,precipitation,and relative humidity were the main three factors affecting the changes in precipitation isotope values,but they changed in response to different time scales.At an annual scale they were precipitation and relative humidity,but in rainy season it was only temperature significant.As for a dry season they were attributed to a combination of all the three factors.
作者
刘澄静
角媛梅
刘志林
刘歆
高璇
LIU Chengjing;JIAO Yuanmei;LIU Zhilin;LIU Xin;GAO Xuan(School of Tourism and Geographical Sciences Yunnan Normal University,Kunming 650500,China)
出处
《山地学报》
CSCD
北大核心
2018年第4期519-526,共8页
Mountain Research
基金
国家自然科学基金项目(41271203
41761115)~~
关键词
哈尼梯田区
降水
氢氧同位素
旱雨季
相关性分析
Hani Rice Terraces
precipitation
hydrogen and oxygen isotope
dry and wet season
correlation analysis
作者简介
刘澄静(1994-),男,云南宾川人,硕士研究生,主要研究方向:稳定同位素生态学。[LIU Chengjing(1994-),male,born in Binchuan,Yunnan province,M.Sc.candidate,research on stable isotope ecology]E-mail:18487101130@163.com;通讯作者(Corresponding author):角媛梅(1972-),女,博士,教授,主要研究方向:景观生态学。[JIAO Yuanmei(1972-),female,Ph.D.,professor,specialized in landscape]E-mail:ymjiao@sina.com.
