摘要
植物群落作为陆地生态系统土壤有机碳的主要来源,可通过地表凋落物分解、细根周转和根系分泌物等方式将光合作用同化的碳输入到土壤中。全球气候变暖正深刻地影响植物群落的分布、结构与功能,改变森林地上和地下凋落物产量与分解速率和根系分泌过程,从而改变植物群落向土壤输入有机碳数量。本文综述了植物群落向土壤有机碳输入过程及其对气候变暖的响应研究进展。研究表明,气候变暖可通过影响植物群落生产直接影响凋落物产量和根系分泌过程,还可通过改变凋落物分解环境条件、凋落物基质质量和分解者群落结构与活性等非生物与生物因子而间接作用于凋落物向土壤有机碳输入过程。气候变暖还可通过影响植物根系性状、根系分泌物化学组成等间接影响植物根系向土壤输入的碳量,但其具体机制还需深入探讨。未来的研究应该关注气候变暖导致植物群落结构改变进而影响土壤有机碳输入的具体机制以及粗木质残体对土壤有机碳输入的贡献,同时还应注重植物凋落物与根系分泌过程的整合研究,以期更全面地认识气候变暖背景下植物群落对土壤碳库及碳循环过程的贡献。
Plant communities,as one of the main source of soil organic carbon,can transport organic carbon into soils through litter decomposition,fine root turnover,and root exudation.Global climate warming is profoundly changing the distribution,structure and function of plant communities,with consequences on the amount and quality of plant community-derived soil organic carbon inputs through changing above-and below-ground litter production and decomposition and root exudation processes. In this review,we systematically summarized research progress on soil organic carbon inputs by plant communities and its responses to climate warming. Climate warming could directly affect litter production and root exudation processes by changing plant growth,and indirectly affect carbon inputs by changing the biotic and abiotic factors affecting litter decomposition,such as micro-environmental condition,litter quality and structure and activity of decomposers. Climate warming could indirectly affect carbon inputs from plant roots by affecting root traits and root exudate composition. However,the potential mechanisms need to be further explored. Future studies should focus on the mechanisms underlying the effects of climate warming on plant community structure,which could affect soil organic carbon inputs and the con-tribution of coarse woody debris to soil organic carbon. The integration of litter decomposition and root exudation processes should be conducted to better understand the contribution of plant communities to soil carbon pool and carbon cycling processes under climate warming.
作者
马志良
赵文强
MA Zhi-liang;ZHAO Wen-qiang(College of Life Science,China West Normal University,Nanchong 637009,Sichuan,China;Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization,Sichuan Province Key Laboratory of Ecological Restoration and Biodiversity Conservation,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2020年第1期270-281,共12页
Chinese Journal of Ecology
基金
西华师范大学博士科研启动基金项目(18Q047)
四川省科技计划项目(2018SZ0330,18ZDYF0307)资助
关键词
土壤碳库
植物群落
凋落物分解
细根周转
根系分泌物
气候变暖
soil carbon pool
plant community
litter decomposition
fine root turnover
root exudate
climate warming
