土壤碳循环对地下水位的响应研究进展  

Review on response of soil carbon cycle to groundwater level change

作　　者：苏天燕 刘文杰[1] 杨秋[1] 毛伟 Su Tianyan;Liu Wenjie;Yang Qiu;Mao Wei(College of Ecology and Environment,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学生态与环境学院,海南海口570228

出　　处：《中国沙漠》2020年第5期180-189,共10页Journal of Desert Research

基　　金：国家重点研发计划项目(2018YFD021105);国家自然科学基金项目(41671208);海南大学科研启动基金项目(KYQD20035)。

摘　　要：地下水位通过影响土壤微生物活性、植物根系周转和土壤呼吸速率等改变凋落物和土壤有机质的分解速率与程度,进而影响土壤有机碳(SOC)的积累与损耗过程。过去研究集中在温度和降水等影响因素对土壤碳转化过程和碳储量动态等的影响,较少关注地下水位波动引起的变化,尤其缺乏在不同生态系统中地下水位变化后植物根系-微生物-SOC交互作用对土壤碳循环影响的研究。基于此,结合近年国内外土壤碳周转过程相关研究,总结地下水位变化对根系碳分配、微生物群落碳代谢以及土壤呼吸的影响,进一步探讨地下水位与土壤碳循环的动态关系;同时对比研究了地下水位变化后不同生态系统类型土壤有机碳的变化规律。研究将有助于揭示地下水位变化对土壤碳循环动态的调控机制,利于阐明未确定的陆地碳储量,完善陆地生态系统碳循环模型,为应对全球变化提供科学的理论基础。The fluctuation of groundwater tables affects the rate and degree of decomposition of litter and soil organic matter. It affects the microbial activity of soil,the turnover of plant root and the respiration rate of soil,and thus affects the accumulation and loss of SOC(soil organic carbon). The previous research mainly studied the influencing factors,e.g.,temperature and precipitation,on the process of soil carbon conversion and the dynamic of carbon stock,lacking the understanding of how soil carbon cycle dynamics in different levels of underground water table due to the interaction of plant root system-microorganism-SOC. Based on this,this paper combined with the recent domestic and foreign soil carbon turnover process related research,summarizes the groundwater table effect on underground carbon distribution of plant roots,carbon metabolism of microbial communities and soil respiration in respective,and analyzes the dynamic relationship between groundwater depth and soil carbon cycle in-depth. The study benefit to reveal the soil carbon cycle dynamics in different groundwater depth,explain the uncertainty of regional terrestrial carbon sink assessment adequately,improve the terrestrial ecosystem carbon cycle model,and provide scientific theoretical support for terrestrial ecosystems to reply to the global changes.

关 键 词：地下水位 土壤有机碳 土壤微生物 植物根系 土壤呼吸 

分 类 号：S153[农业科学—土壤学]