地表流域有机碳地球化学研究进展  

Advances in study on organic carbon characteristics in the riverine systems

作　　者：周苗 李思亮 丁虎[2] 覃蔡清 岳甫均 

机构地区：[1]天津大学表层地球系统科学研究院,天津300072 [2]中国科学院地球化学研究所,环境地球化学国家重点实验室,贵阳550002

出　　处：《生态学杂志》2018年第1期255-264,共10页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41571130072)和国家重点研发计划项目(2016YFA0601000)资助.

摘　　要：地球关键带的各个界面是有机碳发生剧烈分解转化的场所,探讨关键带有机碳的动态变化、归趋及其控制过程,是揭示地表流域中物质运输和能量传递规律的重要基础,对维持生态系统平衡具有重要意义。本文介绍了国内外关于流域不同关键带有机碳的研究方法、来源、储量及其动态、周转过程等地球化学特征的研究进展,以及现有研究存在的问题。建议将典型关键带作为一个整体来研究,综合使用多种技术方法,将短期高频次观测和长期定位观测研究相结合,在典型小流域开展多界面、多过程、多时间尺度的长期同步观测和系统研究,揭示控制关键带有机碳地球化学循环的关键因子及其作用机制。同时重视长时间尺度下有机碳循环对全球变化和人类活动的响应及反馈机制;分析不同人为活动下,大气-植物-凋落物-土壤-河流之间的碳交换特征及流域有机碳动态变化规律;定量区分环境变化和人类活动对关键带有机碳地球化学行为的影响,为碳循环模型优化及气候变化预测提供科学依据。c The interfaces of the Earth＇ s critical zones are the place where organic carbon is dra- matically decomposed and transformed. The dynamics and fate of organic carbon serve as an im- portant foundation of revealing the material transportation and energy transfer in the critical zones, which is of great significance to support the ecological system. The geochemical character- istics of organic carbon in riverine system is reviewed in this study, including the research meth- ods, sources, storage, dynamics and turnover process of organic carbon. It is suggested that the the dynamics of organic carbon in the critical zones should be studied well for understanding car- bon cycling in the riverine systems. Various technical methods, short-term high-frequency obser- vation, long-term observation research in the multi-interface with multi-time scales should be con- ducted in typical critical zones, in order to reveal the key factors and its mechanisms of organic carbon dynamics and processes in the riverine systems. Furthermore, the response and feedback mechanism of organic carbon cycle to global change and human activities on long-time scales should be studied. Besides, the carbon exchange between interfaces of atmosphere-plant-litter- soil-river and the dynamics of organic carbon in watersheds should be further analyzed under dif- ferent disturbance intensities of human activities. Understanding the impacts of environmental changes and human activities on the geochemical cycling of organic carbon in critical zones would benefit the optimization of carbon cycling model and climate change predictions.

关 键 词：流域 有机碳循环 关键带 碳周转 碳水耦合 

分 类 号：P592[天文地球—地球化学]