树轮稳定氮同位素记录的进展与展望  

Stable nitrogen isotope in tree rings: Progresses, problems and prospects

作　　者：王可逸 刘晓宏 曾小敏 徐国保 张凌楠 李春越 WANG Keyi;LIU Xiaohong;ZENG Xiaomin;XU Guobao;ZHANG Lingnan;LI Chunyue(School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China;State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,CAS,Lanzhou 730000,China;Qinghai Research Center of Qilian Mountain National Park,Xining,Qinghai 810008,China)

机构地区：[1]陕西师范大学地理科学与旅游学院,西安710119 [2]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 [3]祁连山国家公园青海研究中心,西宁810008

出　　处：《地理学报》2021年第5期1193-1205,共13页Acta Geographica Sinica

基　　金：国家自然科学基金项目(41971104);中央高校基础研究经费(GK202107009);中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金(SKLLQG1817);祁连山国家公园青海研究中心开放课题(GKQ2019-01)。

摘　　要：树轮稳定同位素比率是研究气候变化与环境演变的有效代用资料,耦合分析树轮稳定同位素记录的信息可揭示森林生态系统碳—水—氮时空变化特征及相互作用,反映环境变化对植物特定化合物的生理影响。树轮稳定氮同位素比率(δ^(15)N)与树木生长的环境条件密切相关,其变化可以反映长时间尺度森林生态系统氮循环的动态特征,弥补监测资料的不足。本文综述了树轮稳定氮同位素的分馏机理与测定方法,解析了树轮δ^(15)N在样品预处理和测试中需要关注的问题,系统梳理与归纳了基于树轮δ^(15)N进行气候变化、环境演变和人类活动氮排放研究的进展。指明中国树轮稳定氮同位素研究潜力及其在未来亟需着重发展的方向,旨在推动森林生态系统氮循环时空特征深入研究。Stable isotope in tree rings are effective proxies for the study of climate change and environmental evolution. Coupling analysis of stable isotope records of tree rings can reveal the spatiotemporal variation characteristics and interactions of carbon, water and nitrogen in forest ecosystems, and reflect the physiological effects of environmental changes on plantspecific compounds. The stable nitrogen isotope ratio(δ^(15) N) in tree rings is closely related to the environmental conditions of tree growth, and the change of ratio can indicate the dynamic characteristics of nitrogen cycle in forest ecosystem on a long-term scale, and make up for the lack of monitoring data. Herein, we reviewed the theory of the stable nitrogen isotope fractionation and measuring method, and found out the issues that need to be paid attention to in sample pretreatment and measurement. Furthermore, we synthetically stated and evaluated the reports of climate and environment evolution based on δ^(15) N of tree-rings, and the effects of human activities on nitrogen cycle in forest ecosystem. We suggested the great potential of treering δ^(15) N in combination of the multiple isotope proxies and its development directions in the future, which should promote further studies on the spatiotemporal characteristics of nitrogen cycle in forest ecosystems.

关 键 词：树木年轮 稳定氮同位素比率 气候变化 氮循环 森林生态系统 

分 类 号：S718.55[农业科学—林学]