作　　者： ; ;

机构地区： 中国科学院广州地球化学研究所

出　　处： 《地球科学进展》 1998年第4期369-375,共7页

摘　　要： 河流碳通量系陆地侵蚀产物，它构成全球碳循环的一个重要环节。河流碳通量在数量上远小于全球碳循环的其他环节，但由于与陆地生态系统联系密切，故对它的研究尤为重要。全球每年河流碳通量约为１ＧｔＣ（１０９ｔ碳），其中约６０％为无机碳、４０％为有机碳。溶解态有机碳和颗粒状有机碳主要来源于土壤侵蚀，另有一部分有机碳来源于河湖中的浮游植物；溶解态无机碳主要源于大气中ＣＯ２和碳酸盐；颗粒无机碳主要指未溶解的碳酸盐。亚洲季风区河流对全球河流碳通量具有较大贡献，而对其研究程度较低。河流碳通量研究既可为流域治理提供基础资料，也是进一步了解人为ＣＯ２“未知汇”的途径之一。 Riverine carbon, which stems from continental erosions, represents an important link in the global carbon cycle. It is small in quantity compare with other links of the global carbon cycle, however, it deserves especial investigation for its close connection with land ecosystem. The total carbon transported to ocean by rivers is about 1 Gt every year, 60% of which is inorganic carbon, and 40% of which is organic one. Dissolved and particulate organic carbon (DOC and POC, respectively) come from the chemical and mechanical erosion of the soil. On the other hand, the phytoplankton is another source of a small part of organic carbon. Dissolved inorganic carbon (DIC) is the result of the dissolution of atmospheric carbon dioxide and carbonate. Undissolved carbonate composes of particulate inorganic carbon (PIC). The rivers in monsoonal Asia make the greatest contribution to the global riverine carbon flux for the most intense erosion in those areas. However, the investigation of the riverine carbon flux in monsoonal Asia is not being penetrated enough. The research of riverine carbon flux would provided scientific basis for the soil and water conservation, and it is also a new way to probe the anthropogenic carbon dioxide missing sink.

关 键 词： 河流 碳通量 陆地侵蚀 温室效应 二氧化碳

领　　域： [天文地球] [天文地球] [农业科学] [农业科学]