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引用本文:华明权,章新平,姚天次,罗紫东,周慧,饶志国,贺新光.长沙桃子湖湖水稳定同位素的变化及其影响因素.湖泊科学,2018,30(6):1766-1778. DOI:10.18307/2018.0627
HUA Mingquan,ZHANG Xinping,YAO Tianci,LUO Zidong,ZHOU Hui,RAO Zhiguo,HE Xinguang.Variation characteristics and influencing factors of the stable water isotopes in Lake Peach in Changsha City. J. Lake Sci.2018,30(6):1766-1778. DOI:10.18307/2018.0627
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长沙桃子湖湖水稳定同位素的变化及其影响因素
华明权1, 章新平1,2, 姚天次3, 罗紫东1, 周慧1, 饶志国1, 贺新光1,2
1.湖南师范大学资源与环境科学学院, 长沙 410081;2.湖南师范大学地理空间大数据挖掘与应用湖南省重点实验室, 长沙 410081;3.中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室, 北京 100101
摘要:
基于对长沙桃子湖湖水和降水中稳定同位素的监测数据,分析了湖水中稳定同位素的变化特征及其与降水和蒸发的关系,旨在了解湿润气候条件下小型湖泊的湖水稳定同位素的变化规律,揭示降水和蒸发对湖水稳定同位素变化的具体影响.在时间变化上,湖水稳定同位素具有明显的季节变化,湖水中δ18O的最大值出现在春季,最小值出现在冬季;湖水中过量氘的最大值出现在5-6月,最小值出现在9-10月.在空间变化上,桃子湖不同深度和不同空间点上的湖水中δ18O差异很小,说明湖水基本处于均匀混合状态.当5日累计降水量≥ 20.3 mm时,湖水中δ18O的变化与5日累计降水量之间的负相关关系非常显著,但与5日累计蒸发量之间呈弱正相关;湖水中过量氘的变化与5日累计降水量之间无显著相关关系,但与5日累计蒸发量之间呈弱的相关性;相比于平均湖水蒸发线,该降水段的蒸发线斜率和截距均有明显增加.当累计降水量<20.3 mm时,湖水中δ18O的变化与5日累计降水量之间的相关程度明显降低,但与5日累计蒸发量之间的相关程度则明显提高;湖水中过量氘的变化与5日累计降水量以及与5日累计蒸发量之间的相关关系显著提高;相比于平均湖水蒸发线,该组蒸发线的斜率和截距均有明显减小.
关键词:  稳定同位素  过量氘  桃子湖  降水  蒸发  长沙
DOI:10.18307/2018.0627
分类号:
基金项目:国家自然科学基金项目(41571021,41772373)、湖南省重点学科建设项目(20160001)和湖南省研究生科研创新项目(CX2017B229)联合资助.
Variation characteristics and influencing factors of the stable water isotopes in Lake Peach in Changsha City
HUA Mingquan1, ZHANG Xinping1,2, YAO Tianci3, LUO Zidong1, ZHOU Hui1, RAO Zhiguo1, HE Xinguang1,2
1.College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, P. R. China;2.Key Laboratory of Geospatial Big Data Mining and Application of Hunan Province, Hunan Normal University, Changsha 410081, P. R. China;3.Key Laboratory of Water Cycle and Related Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, P. R. China
Abstract:
Based on the monitoring data of stable isotopes in lake water and precipitation in Lake Peach in Changsha, the variation characteristics of stable isotopes in lake water in relation to precipitation and evaporation were analyzed. Our aims are to reveal the contributions of precipitation and evaporation to the variations in stable isotopes of the lake water and to understand the mechanism of stable isotopic variation in a small lake under humid climate conditions. In the temporal distributions, the seasonal variation of δ18O in lake was obvious, with the maximum δ18O in spring and the minimum in winter. The high values of d-excess in lake water were recorded in the period from May to June, and the low values in the period from September to October. In the spatial distributions, the differences of δ18O in lake among different depths and sampling points in Lake Peach were not significant, indicating that the lake was basically in a state of homogeneous mixing. The correlation between the variation of δ18O in lake and cumulated 5-day precipitation amount (Ps) was significant, but the variation of δ18O in lake was weakly correlated with the cumulated 5-day evaporation. There was no significant correlation between the variation of d-excess in lake and the Ps, but the variation of d-excess was weakly correlated with the cumulated 5-day evaporation when the Ps ≥ 20.3 mm. Compared with the averaged Lake Evaporation Line (LEL), the slope and intercept of the LEL increased significantly with the Ps ≥ 20.3 mm. Furthermore, when the Ps <20.3 mm, the correlation between the variation of δ18O in lake and the Ps was significantly decreased, but the correlation between δ18O in lake and the cumulated 5-day evaporation was significantly increased. Meanwhile, both the relationships between the variation of d in lake and the Ps as well as the cumulated 5-day evaporation were significantly improved. On an average, the slope and intercept of the LEL were significantly reduced.
Key words:  Stable water isotopes  d-excess  Lake Peach  precipitation  evaporation  Changsha City
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