土壤有机碳和氮分解对温度变化的响应机制

被引:16
作者
吴建国
吕佳佳
机构
[1] 中国环境科学研究院
关键词
温度变化; 土壤碳和氮循环; 气候变化;
D O I
10.13292/j.1000-4890.2008.0300
中图分类号
S154 [土壤生物学];
学科分类号
071012 ; 0713 ;
摘要
土壤碳和氮分解对温度变化响应过程是气候变化对陆地生态系统碳汇影响的关键。本文针对土壤有机碳和氮分解对温度变化响应机制和假说进行了概括分析。土壤碳和氮分解对温度变化的响应机制主要包括:土壤有机质的稳定性、质量及有效性,微生物生物量和活性及群落结构或多样性,土壤湿度,以及植被生产力、凋落物和pH等因素的作用。对这些机制还存在很大不确定性,需要考虑土壤有机质组分或微生物属性,同时需要考虑土壤有机质组分与微生物属性间的相互作用,以及土壤碳和氮分解对温度变化短期和长期响应过程的差异。土壤碳和氮分解对温度变化的响应机制的3个假说包括有机质分解质量-温度假说、有机质物理化学过程假说和功能移动假说,这些假说还需要验证和补充完善。
引用
收藏
页码:1601 / 1611
页数:11
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