河流有机碳循环研究综述

The review of the research of the riverine organic carbon cycle

综述河流有机碳循环的研究进展,分析河流有机碳的来源(包括外源和内源两种),指出碳的同位素13C和14C是河流有机碳来源示踪的重要工具,以及受气候、地形、植被等因素的影响,河流有机碳的含量有明显的区域和季节差别.阐述影响河流有机碳的产出因素(其中,径流深度、土壤有机碳含量和生物量密度影响最大),得出随着人类活动对流域地表自然过程的干扰程度加剧,河流碳的侵蚀输入过程发生了剧烈变化,尤其是大型水库或拦河坝通过改变河流的水文、水力过程,直接改变了河流有机碳的输送以及河流有机碳的生物地球化学循环过程.

Research progress on the riverine organic carbon cycle was summarized in the paper. The sources of the riverine organic carbon include allochthonous and autochthonous, and the radiocarbons of 13C and 14C in the riverine organic matter are important tracers for the origins of the riverine organic carbon. The contents of the riverine organic carbon were obvious spaceseason distinction by the reason of climate, terrain and vegetation. The output of the riverine organic carbon was influenced by many reasons, where flow deep, organic carbon in soil and biomass in per area were the very significant. The erosion-output of the riverine organic carbon was changing acutely due to the anthropogenic disturbance. The exportion and the biogeochemistry cycles of the riverine organic carbon were changed directly because the hydrology and waterpower were changed by the reservoirs.