河流有机碳的输出通量及性质研究进展

综述河流有机碳输出过程的最新研究进展．指出受人类经济活动的干预，对气候变化响应最敏感的陆地有机碳库的侵蚀通量发生了复杂变化；河流有机碳不但记录了流域侵蚀的历史和现状。还对近海沉积过程和水域生态环境产生重要影响；河流有机碳在通量和性质等方面存在着明显的地区性及流域间差异，且以季风流域与非季风流域之间的对比最为明显；随着水文动力过程的变化，同一流域河流有机碳的性质也发生显著变化；河流有机碳在自陆地生态系统向海洋输送的过程中，放射性同位素组成可因水体微生物的代谢改造而发生变化．使得河流有机碳的^14C年龄偏老．

Advances in studies on transported flux and properties of riverine organic carbon

Some lately advances in the study of riverine organic carbon were summarized in this paper. The transported flux of organic carbon from terrestrial ecosystems to the oceans via rivers, which is one of the most sensitive land surface processes in global climate change, has been changed in quantity due to the anthropogenic disturbance to it. The properties of riverine organic carbon, even in the same drainage, changed notably with the changes of hydrological processes in the drainage. Riverine organic carbon may become aged since they have been metabolized by the riverine microbes in the processes of being transported to the seas from the land, i.e., the radiocarbon in the riverine organic carbon was partially degraded by the microbes.