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应用生态学报 ›› 2022, Vol. 33 ›› Issue (6): 1441-1450.doi: 10.13287/j.1001-9332.202206.007

• 稳定同位素生态学专栏 • 上一篇    下一篇

生态系统光合与呼吸拆分的同位素理论、方法和应用进展

陈昌华1, 王晶苑1, 魏杰1, 温学发1,2,3*   

  1. 1中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室, 北京 100101;
    2中国科学院大学资源与环境学院, 北京 101408;
    3中国科学院大学北京燕山地球关键带国家野外科学观测研究站, 北京 101408
  • 收稿日期:2021-08-19 接受日期:2022-03-29 出版日期:2022-06-15 发布日期:2022-12-15
  • 通讯作者: *E-mail: wenxf@igsnrr.ac.cn
  • 作者简介:陈昌华, 女, 1988年生, 博士。主要从事稳定同位素生态学与生物地球化学研究。E-mail: chenchanghua.ok@163.com
  • 基金资助:
    国家自然科学基金项目(41830860,31901133)和中国博士后科学基金项目(2019M660779)资助。

Theory, method and application advance of isotopic flux partitioning of ecosystem photosynthesis and respiration

CHEN Chang-hua1, WANG Jing-yuan1, WEI Jie1, WEN Xue-fa1,2,3*   

  1. 1Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
    2College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China;
    3Beijing Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing 101408, China
  • Received:2021-08-19 Accepted:2022-03-29 Online:2022-06-15 Published:2022-12-15

摘要: 生态系统光合和呼吸是构成净生态系统CO2交换量(NEE)的重要组分。涡度相关技术可直接观测生态系统NEE,并通过建立温度回归或光响应曲线等函数将NEE统计拆分为生态系统光合和呼吸,但是存在自相关和高估白天呼吸等问题。稳定同位素红外光谱技术的进步使高时间分辨率大气CO2及其稳定碳同位素组成(δ13C)的连续观测成为可能,与涡度相关技术观测的NEE数据相结合,可实现昼夜和季节尺度生态系统光合和呼吸拆分。本文系统阐述了生态系统光合与呼吸的同位素通量拆分方法的基本理论与假设,阐述了同位素通量观测技术的发展及其应用进展,综述了同位素通量拆分理论解析生态系统光合与呼吸过程的新机制认识,最后总结并展望了同位素通量拆分理论的不确定性以及开展多种拆分方法综合比较的必要性。

关键词: 涡度相关技术, 稳定同位素红外光谱, 同位素通量拆分, 生态系统光合, 生态系统呼吸

Abstract: Photosynthesis and respiration are two important components of net ecosystem exchange (NEE). NEE can be directly observed by eddy covariance (EC) technique, and statistically separated into ecosystem assimilation and respiration based on the statistical flux partitioning of temperature response function or light-response curves. However, these methods would result in auto-correlation between assimilation and respiration, and overestimate daytime respiration. Recently-developed isotope ratio infrared spectroscopy permits high-resolution measurement of atmospheric CO2 and its stable carbon isotope composition (δ13C) under field conditions, and achieves diurnal and seasonal partitioning of ecosystem photosynthesis and respiration by matching with NEE measurements from EC. We expounded the fundamental theories and assumptions of isotopic flux partitioning of ecosystem photosynthesis and respiration, elaborated the development and application advance of techniques in isotopic flux measurement, summarized the advance of isotopic flux partitioning to provide new insight into the assimilation and respiration processes, and prospected the uncertainty of isotopic flux partitioning theory and the necessity of comparative researches of various methods.

Key words: eddy covariance technique, isotope ratio infrared spectroscopy, isotopic flux partitioning, ecosystem photosynthesis, ecosystem respiration