氮沉降对草地凋落物分解的影响研究进展

发布时间：2018-11-01 16:15

【摘要】：随着人类干扰和全球变化的加剧,大气氮沉降量迅速地增加,对草地生态系统碳循环过程产生了显著影响。凋落物分解是陆地生态系统养分循环的关键过程,也是土壤碳库的主要来源和维持土壤肥力的基础。凋落物分解深受非生物、生物因子及其交互作用的影响。氮沉降通过影响土壤氮有效性、凋落物产量和质量、土壤生物因子及凋落物分解环境来影响分解。该文综述了氮沉降对草地凋落物分解过程的影响及其机理,包括对土壤氮有效性,凋落物产量、质量,土壤微生物和酶活性以及凋落物分解环境的影响,在系统分析国内外研究现状的基础上,探讨整合了目前氮沉降影响草地凋落物分解的主要研究内容、方向、方法以及存在的主要问题,并对未来的重点研究方向进行了展望,以期为深入研究草地生态系统碳循环过程与氮沉降之间的相互作用与反馈机制提供参考。
[Abstract]:With the aggravation of human disturbance and global change, the amount of atmospheric nitrogen deposition increases rapidly, which has a significant effect on the process of carbon cycle in grassland ecosystem. Litter decomposition is a key process of nutrient cycling in terrestrial ecosystems and is also the main source of soil carbon pool and the basis for maintaining soil fertility. Litter decomposition is deeply influenced by abiotic, biological factors and their interactions. Nitrogen deposition affects soil nitrogen availability, litter yield and quality, soil biological factors and litter decomposition environment. This paper reviewed the effects of nitrogen deposition on litter decomposition process and its mechanism, including the effects on soil nitrogen availability, litter yield, quality, soil microbial and enzyme activity and litter decomposition environment. Based on the systematic analysis of the present research situation at home and abroad, this paper discusses the main research contents, directions, methods and existing problems of the current research on the effects of nitrogen deposition on the decomposition of grassland litter, and prospects the key research directions in the future. In order to provide a reference for the further study of the interaction and feedback mechanism between carbon cycle process and nitrogen deposition in grassland ecosystem.
【作者单位】：北京师范大学地表过程与资源生态国家重点实验室北京师范大学地理科学学部资源学院;
【基金】：国家重点研发计划课题(2016YFC050-0502) 国家自然科学基金(41571048) 国家重点基础研究发展计划(973计划)(2014CB138803)
【分类号】：S812

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