大气氮沉降对森林土壤碳输入输出过程的影响

Effects of atmospheric nitrogen deposition on carbon input and export process of forest soil Abstract

森林是大面积氮沉降的直接承受者,森林土壤碳库占森林生态系统整个碳库的45%,不断加剧的氮沉降对森林土壤碳库输入输出产生了深刻影响,进而影响森林生态系统的结构、过程和功能.作者综述了国内外有关氮输入影响森林土壤碳库输入输出的4个过程:凋落物分解、细根周转、土壤呼吸、可溶性有机碳淋失,并概述了氮输入对4个过程可能的影响机理,探讨了当前森林土壤碳输入输出过程对氮沉降响应研究存在的问题,指出未来该领域研究的重点和方向.

Forest is the direct acceptor of large-area nitrogen deposition,carbon pool of forest soil accounts for45%of the whole forest ecosystem carbon pool.The increasing nitrogen deposition has a profound impact on the input and output of forest soil carbon pool,and then affects the structure,process and function of forest ecosystem.To investigate the possible mechanism of nitrogen deposition,four processes of nitrogen deposition(litter decomposition,fine root turnover,soil respiration,dissolved organic carbon leaching)affecting forest soil carbon pool input and output were reviewed,the existing problems in the response of forest soil carbon input and output process to nitrogen deposition were discussed,and the emphasis and direction of future research were pointed out.