摘要
大气氮沉降对受氮限制的陆地生态系统碳截存/损耗的机理尚不清楚,尤其是对土壤有机碳(SOC)的输入、转化和输出过程的认识明显不足。本文论述了外源性氮素(氮沉降、人为增氮)对凋落物分解、土壤有机碳各组分周转的影响,以及土壤呼吸各组分(根系自养呼吸、根际微生物呼吸和SOM分解)对增氮的响应等领域的最新研究进展,指出了在上述研究领域中存在的问题,并提出拟解决的途径以及未来的可能研究方向,以期为该领域的研究提供参考。
It is unclear the mechanisms of nitrogen deposition to carbon sequestration and depletion in terrestrial ecosystem where restricted by nitrogen, especially lack of understanding on processes of soil organic carbon input, transformation and output. In this paper, newly research advances on the influence of extrinsic nitrogen （such as nitrogen deposition and adding nitrogen） on decomposition of litter and turnover of soil organic matter fractions are discussed. In addition, the different responses of soil respiration components （such as root respiration, microbial respiration of rhizodeposits and SOM decomposition） on nitrogen increase are also concerned. Furthermore, uncertainties and countermeasures and potential directions are pointed out in above three research fields.
出处
《水土保持学报》
CSCD
北大核心
2007年第5期82-85,共4页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(30600071)和(40601097)资助
关键词
氮沉降
凋落物分解
土壤有机碳周转
土壤呼吸
稳定性碳同位素
nitrogen deposition
decomposition of litter
turnover of soil organic matter
soil respiration
stable isotopes
