河流有机质生物地球化学研究进展

Progress in the study of biogeochemistry of riverine organic matter

探讨了近年来河流中有机质的生物地球化学研究状况。大多数河流有机质的来源主要是外源即流域侵蚀而来的,经过河流的新陈代谢过程,把河流中的悬浮物分解为不同类型的有机质。在有机质分解过程中由于外部条件的差异,形成粒径大小不同的颗粒物和溶解有机质、无机质等。河流水体中的溶解有机碳(DOC)在全球不同纬度、不同区域,其含量差异较大,但目前对其生物地球化学控制的量级缺乏足够的理解和认识。另外碳氮同位素及其比值在当前的河流有机质生物地球化学研究中仍起着非常重要的示踪作用。

The paper discussed the study of biogeochemistry condition of riverine organic matter in recent years. Riverine organic matter mainly input from local land-derived sources, drainage basin erosion, less autochthonous algal production. Riverine suspended matter was divided into different kinds of organic matter through its metabolism processes. Owing to diversity of external condition, organic matter was divided into different-sized particulate material, dissolved organic matter and inorganic matter. Riverine dissolved organic carbon （DOC） had much differentia at different latitude and area. We had obviously deficient cognized for its control magnitude and degree for its riverine biogeochemical processes in the study. In addition, carbon and nitrogen isotope and its ratio was important indicator in the riverine biogeochemistry study.