土壤碳淋溶流失研究进展

土壤碳的淋溶流失是指在水的作用下土壤中的碳沿着水文路径转移到水环境的过程。尽管这些流失量有限,却对陆地碳平衡核算具有重要影响。本文在总结了土壤碳淋溶流失研究的重要性、近年来相关领域取得的进展的基础上,指出已有研究的不足有:对土壤无机碳(SIC)的淋溶流失研究薄弱、缺乏野外实地观测、对土地利用变化影响土壤碳淋溶流失的过程与机制认识不足等。今后除了加强以上几个方面的研究外,还要综合利用同位素示踪和在线仪器观测等各种手段,开展"陆地-水生系统连续体"内多界面碳交换的综合研究。

Advances in Study on Leaching Loss of Carbon from Soil

Leaching loss of soil carbon refers to release of soil carbon into aquatic environment driven by water movement along the hydrological flow paths. Despite the limited amount, leaching loss of soil carbon has important implications on estimation of terrestrial carbon balance budget. In this paper, the importance and recent progress of soil carbon leaching study are introduced, based on which shortages of related study are then specified. These shortages include lack of the study on soil inorganic carbon leaching, less field observing than laboratory experiment, and poor understanding about the impact of land use change on soil carbon leaching, etc. Besides above research areas, future research should pay attention to carbon exchanges in "land-ocean aquatic continuum", which synthesize carbon exchange processes at soil-atmosphere, soil-water, and water-atmosphere interfaces.