地理学报 ›› 2021, Vol. 76 ›› Issue (5): 1193-1205.doi: 10.11821/dlxb202105011

• 气候变化与地表过程 • 上一篇    下一篇

树轮稳定氮同位素记录的进展与展望

王可逸1(), 刘晓宏1,2,3(), 曾小敏1, 徐国保2, 张凌楠1, 李春越1   

  1. 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
  • 收稿日期:2020-05-18 修回日期:2021-03-12 出版日期:2021-05-25 发布日期:2021-07-25
  • 通讯作者: 刘晓宏(1972-), 男, 陕西韩城人, 教授, 主要从事树轮稳定同位素记录与生物地球化学循环研究。E-mail: xhliu@snnu.edu.cn;liuxh@lzb.ac.cn
  • 作者简介:王可逸(1995-), 女, 内蒙古呼和浩特人, 硕士生, 主要从事树轮稳定氮同位素方面的研究。E-mail: wky@snnu.edu.cn
  • 基金资助:
    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)

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

WANG Keyi1(), LIU Xiaohong1,2,3(), ZENG Xiaomin1, XU Guobao2, ZHANG Lingnan1, LI Chunyue1   

  1. 1. School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China
    2. State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, CAS, Lanzhou 730000, China
    3. Qinghai Research Center of Qilian Mountain National Park, Xining, Qinghai 810008, China
  • Received:2020-05-18 Revised:2021-03-12 Published:2021-05-25 Online:2021-07-25
  • Supported by:
    National Natural Science Foundation of China(41971104);The Fundamental Research Funds for the Central Universities(GK202107009);The Open Foundation of the State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment(SKLLQG1817);The Qilian Mountain National Park Research Center (Qinghai)(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(δ15N)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δ15N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δ15N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。

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

Abstract:

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 plant-specific compounds. The stable nitrogen isotope ratio (δ15N) 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 δ15N of tree-rings, and the effects of human activities on nitrogen cycle in forest ecosystem. We suggested the great potential of tree-ring δ15N 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.

Key words: tree ring, stable nitrogen isotope ratio, climate change, nitrogen cycle, forest ecosystem