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朱珊娴,肖薇,张弥,王伟,沈竞,徐家平,胡勇博,温学发,李旭辉.加拿大温带落叶林生态系统氢氧同位素组成研究.生态学报,2017,37(22):7539~7551 本文二维码信息
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加拿大温带落叶林生态系统氢氧同位素组成研究
Hydrogen and oxygen stable isotopic composition in a deciduous forest ecosystem in Canada
投稿时间:2016-09-13  
DOI: 10.5846/stxb201609131851
关键词森林生态系统  氢氧同位素  过量氘  同位素通量  蒸散
Key Wordsforest ecosystem  hydrogen and oxygen isotopes  deuterium excess  isoflux  evapotranspiration
基金项目国家自然科学基金项目(41475141,41505005,41575147)
作者单位E-mail
朱珊娴 南京信息工程大学大气环境中心, 南京 210044  
肖薇 南京信息工程大学大气环境中心, 南京 210044;南京信息工程大学江苏省大气环境与装备技术协同创新中心, 南京 210004 wei.xiao@nuist.edu.cn 
张弥 南京信息工程大学大气环境中心, 南京 210044;南京信息工程大学江苏省大气环境与装备技术协同创新中心, 南京 210004  
王伟 南京信息工程大学大气环境中心, 南京 210044;南京信息工程大学江苏省大气环境与装备技术协同创新中心, 南京 210004  
沈竞 南京信息工程大学大气环境中心, 南京 210044  
徐家平 南京信息工程大学大气环境中心, 南京 210044  
胡勇博 南京信息工程大学大气环境中心, 南京 210044  
温学发 中国科学院地理科学与资源研究所生态系统网站观测与模拟重点实验室, 北京 100101  
李旭辉 南京信息工程大学大气环境中心, 南京 210044  
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摘要:
陆地生态系统氢氧稳定同位素能为陆地与大气的水分交换和陆地生态系统水文循环研究提供独特的示踪信息。基于2009年生长季加拿大落叶林生态系统氢氧稳定同位素组成及环境要素的观测数据,分析了生态系统不同来源液态水和大气水汽同位素组成的时空变化特征,分析了生态系统蒸散与土壤蒸发的同位素组成和同位素通量(Isoflux)的变化特征,并讨论了主要的环境控制因素。结果表明,生态系统中不同来源液态水的同位素组成差别较大,与枝条水和土壤水相比,叶片水同位素组成最富集且变化幅度最大。大气水汽H218O和HDO同位素组成随着高度升高而降低,水汽同位素值日变化呈"W"型分布,上午水汽同位素值降低,正午有一定的起伏,傍晚回升。水汽同位素组成与大气湿度有显著的相关性,大气水汽过量氘下午均值与表面相对湿度和水汽混合比的相关系数分别为-0.61(P < 0.01)和-0.57(P < 0.01)。受蒸腾速率和叶水同位素富集程度的共同作用,白天蒸散H218O组成在正午和傍晚高,下午低。Isoflux的计算结果表明白天下垫面蒸散有助于大气水汽同位素富集,蒸散同位素通量最高可达147.5 mmol m-2 s-1 ‰。本研究结果能为同位素水文模型提供数据支持和理论参考。
Abstract:
Hydrogen and oxygen stable isotopes in terrestrial ecosystems can provide unique trace information for studies on water exchange between land and the atmosphere and the hydrological cycle in terrestrial ecosystems. We observed stable isotopic composition and environmental factors in a Canadian deciduous forest during the 2009 growing season. The spatial pattern and temporal variability in isotopic composition for various ecosystem water pools and atmospheric water vapor were analyzed. Further, the variability of the isotopic composition of ecosystem evapotranspiration, and soil evaporation, and their isoflux were analyzed. The main controlling environmental factors were discussed. The results indicated that the isotopic composition varied in different water pools. The isotopic composition of leaf water was more enriched and more variable with comparison to twig and soil water. The H218O and HDO composition of atmospheric water vapor (δ18Ov and δDv) decreased with increasing height, and the opposite occurred for deuterium-excess. The diurnal pattern of water vapor isotopes showed a "W" pattern, decreased during the morning, rose and fell slightly at noon, and increased in the afternoon. The isotopic composition of water vapor was significantly correlated with atmospheric moisture, and the mid-day means of the deuterium excess of atmospheric water vapor were both negatively correlated with surface relative humidity and the water vapor mixing ratio, with correlation coefficients of -0.61 (P < 0.01) and -0.57 (P < 0.01), respectively. The H218O composition of evapotranspiration was higher at noon and in the evening and lower in the afternoon because of the influence of evapotranspiration rate and leaf-water enrichment. The isoflux indicated that evapotranspiration could promote the isotopic enrichment of atmospheric water vapor, with a maximum isoflux of 147.5 mmol m-2 s-1 ‰. Our results could provide data support and theory reference to the development of isotopic hydrological models.
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