树木年轮汞记录:进展、问题和展望  

Mercury in tree rings:Advances,problems and prospects

作　　者：康虎虎 刘晓宏 张馨予 郭军明 吴国菊 徐国保 康世昌 KANG Hu-hu;LIU Xiao-hong;ZHANG Xin-yu;GUO Jun-ming;WU Guo-ju;XU Guo-bao;KANG Shi-chang(State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Enwironment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Univesity of Chinese Academy of Sciences,Beijing 100049,China;School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China)

机构地区：[1]中国科学院西北生态环境资源研究院冰冻圈科学国家重点实验室,兰州730000 [2]中国科学院大学,北京100049 [3]陕西师范大学地理科学与旅游学院,西安710119

出　　处：《应用生态学报》2021年第10期3733-3742,共10页Chinese Journal of Applied Ecology

基　　金：中国科学院先导专项(XDA20040501);国家自然科学基金项目(41971104);冰冻圈科学国家重点实验室自主课题(SKLCS-ZZ-2020)资助。

摘　　要：汞作为生物毒性较强的金属元素之一,通过食物链富集进而威胁生态系统健康。汞在森林生态系统中的通量以及储量变化成为汞地球化学循环的重要影响因素。受汞监测记录的时空分布限制,对汞的时空分布变化认识尚不全面。分布广泛的树木是环境汞污染的有效生物监测器之一,能够利用树轮中的汞记录开展汞的时空分布变化研究。环境中的汞通过根系、叶片、树皮等组织吸收富集,最终在树木年轮中得以保存。因此,树轮能够重建污染历史并根据同位素比率反映地球化学循环特征。本文综述树木年轮汞浓度和汞同位素比率测量方法以及树轮汞浓度重建的应用,探讨树轮汞同位素记录在环境重建中以及森林生态系统汞的地球化学循环研究潜力,指出今后研究需要关注的问题。As a highly biotoxic element,mercury(Hg)can be enriched by the food chain and has negative effect on ecosystems.Changes of Hg flux and reserves in forest have important effects on its biogeochemical cycle in forest ecosystem.Due to limitation of temporal and spatial monitoring,there is not comprehensive understanding on Hg distribution.Widely distributed trees can be used as effective bio-monitors and Hg records in tree rings can be used to study Hg temporal and spatial distribution.Hg accumulated by root,leaf,bark,and other tissues can be detained in bole and record environmental Hg variations.Therefore,historical Hg trends can be restructured by analyzing Hg concentration in tree rings and the biogeochemical characteristics can be understood with Hg isotope ratio.We reviewed the method of measurement of Hg concentration and isotope ratio and application of reconstruction using Hg concentration in tree ring.We suggested the great application potential of Hg isotope ratio in atmospheric Hg construction and biogeochemistry cycle and raised concerns in further studies.

关 键 词：树木年轮 汞污染 生物地球化学循环 时空变化 森林生态系统 

分 类 号：S718.4[农业科学—林学]