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土壤碳排放组分区分的研究进展

庞蕊1,2,刘敏1,2,李美玲1,徐兴良1*#br#   

  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 100049)
  • 出版日期:2017-08-10 发布日期:2017-08-10

Advances in research on the separation of soil carbon emissions.

PANG Rui1,2, LIU Min1,2, LI Mei-ling1, XU Xing-liang1*#br#   

  1. (1Key Laboratory of Ecosystem Network observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 2College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China).
  • Online:2017-08-10 Published:2017-08-10

摘要: 土壤呼吸作为全球碳循环的一个重要组成部分,是理解地下碳排放过程与土壤有机碳稳定性的关键环节。然而,土壤呼吸是由不同组分构成,目前对有关土壤呼吸的许多关键术语尚存在理解片面和使用不当问题,阻碍了相关土壤碳循环的研究进程。本文针对此现状,分别从土壤呼吸各组分所利用的碳源、产生的部位与途径等方面综合分析了国内外土壤碳排放的研究进展及对陆地生态系统地下碳排放过程的认知,并对所涉及的相关术语进行梳理与界定。在此基础上,阐释了土壤呼吸各组分对大气CO2浓度的贡献及其对全球变暖的响应;结合当前有关土壤碳循环的研究热点,强调了区分陆地生态系统土壤呼吸各组分的必要性与生态重要性,指出深入研究根际激发效应发生机制是破译未来生态系统地下碳循环过程的关键。

关键词: 渗漏淋失, 控释尿素, 氮肥利用效率, 双季稻, 产量

Abstract: As the major component of global carbon cycle, soil respiration is a key to understand belowground carbon emissions and soil organic carbon stability. However, soil respiration is composed of different components, and many key terms related to soil respiration are still onesided understood and improperly used, which hinders further research on soil carbon cycling. Thus, this paper summarized the advances in belowground carbon emissions according to the sources of carbon use, production locations and pathways for the components of soil respiration. Correspondingly, we clarified the terms related to soil respiration. Furthermore, we interpreted the contributions of different components of soil respiration to atmospheric CO2 and their responses to global warming. Finally, combined with hot topics in current soil carbon cycle research, we emphasized the necessity and ecological significance to distinguish the components of soil respiration in terrestrial ecosystems. We prospected that exploring the mechanisms responsible for rhizosphere priming effect will be a key for the future research on ecosystem underground carbon cycling. Knowledge of rhizosphere priming effect will greatly improve our understanding dynamics of soil organic carbon and its stability.

Key words: yield, controlled release urea, N use efficiency, double-cropping rice, N leaching loss