氮沉降对草原凋落物分解的影响

大气氮沉降增加是全球变化的重要现象之一,草原生态系统对氮沉降增加的响应成为草地生态学的研究热点之一。凋落物分解是草原生态系统养分循环和能量流动的主要途径,氮沉降增加引起草原植物群落结构变化,导致凋落物质量、土壤肥力、土壤微生物和土壤动物的变化,最终影响凋落物的分解。本文综述了氮沉降对草原凋落物结构、化学组成和分解环境的影响等方面的国内外最新研究进展,讨论了需进一步加强研究的内容,以期为进一步拓展该领域研究的广度和深度、为全面分析和评估全球变化对草原生态系统的影响提供参考。

Advances in the Effect of Nitrogen Deposition on Grassland Litter Decomposition

As one of the important phenomena of global change, nitrogen deposition impact on ecosystem is now being taken seriously intoconsideration, especially its effect on grassland ecosystems. Therefore, it has become one of key research areas in grassland ecology to revealthe effects of nitrogen deposition on grassland litter decomposition which has already shown the influence. Litter decomposition is a key pro-cess of nutrients cycling and energy flowing in grassland ecosystem. Advanced N deposition can cause the change of phytocoenosium struc-ture, litter quantity, soil fertility, soil microorganism and animals, and finally affect litter decomposition. Based on the domestic and interna-tional progress of latest study, this paper reviewed main progresses on litter quality, chemical composition and environment of litter decompo-sition in the areas. Some topics should be focused on future in order to expand the research scope, analyze the problems comprehensively andevaluate the effect of global change on grassland ecosystem.