中国区域碳循环研究进展与展望

中国陆地和海洋生态系统的区域碳循环在全球碳循环过程中占有重要地位。目前,中国陆地生态系统在全球碳循环中的地位和作用已有比较深入的研究,而中国边缘海系统碳循环研究相对薄弱。简要回顾中国碳循环（以现代过程的描述为主）的研究动态,重点阐述中国边缘海碳循环研究概况及CO2的海-气交换、有机碳循环、颗粒有机碳的输出、河流的输运等海洋碳循环过程的关键科学问题。在汇总补充及数据更新的基础上勾画了中国区域碳循环框架。我们认为,中国的区域碳循环过程尚有诸多未知量和不确定性,缺乏把陆、海、气作为一个系统的综合研究,海洋生态系统碳循环研究尤其需要加强。中国边缘海的碳循环研究应当围绕CO2的汇源过程这一碳循环的中心问题,深入开展边缘海碳的生物地球化学及其与大气CO2的耦合作用等方面的研究。

REGIONAL STUDIES OF CARBON CYCLES IN CHINA:PROGRESS AND PERSPECTIVES

Both China's terrestrial and marginal sea systems represent important components of the global carbon cycle. While the Chinese terrestrial ecosystems have been relatively well studied, carbon cycles in Chinese marginal seas are to be better understood. Chinese marginal seas including Yellow Sea, East China Sea and South China Sea represent a major component of the world ocean margin. This paper is attempting to provide an overview of the researches on the cycling of carbon in both Chinese terrestrial systems and marginal seas. Emphases are given to identify key processes that may be responsible for the carbon cycles. Based upon a regional carbon cycle box model that we compiled from updated data sets available, we conclude that there exist substantial unknowns and uncertainties in terms of both fluxes and processes. While we generally lack studies that integrate regional atmospheric-ocean margin land system processes, carbon cycling studies in Chinese marginal seas are particularly needed.