由于土壤有机质中含有大量的碳,因而其对气候变化的响应引起了人们极大的兴趣。在近期的一篇文章中,Liski等人认为陈年土壤有机质对温度变化的敏感程度不如新鲜凋落物。他们的结论是将土壤有机质的周转模型与净初级生产力(NPP)模型耦合后推断得出的,实际上并没有实验数据能够直接支持或反驳他们的结论。Bunnell等人在一项研究中发现,阿拉斯加冻原中微生物的呼吸作用对温度的敏感程度从凋落物层到发酵层、进而至腐殖质 Due to the large amount of carbon in soil organic matter, its response to climate change aroused great interest. In a recent article, Liski et al. (2001) considered the aged soil organic matter less sensitive to temperature changes than fresh litter. Their conclusion is inferred from the coupling of the turnover model of soil organic matter with the net primary productivity (NPP) model, and in fact there is no experimental data that directly supports or refutes their conclusion. In a study, Bunnell et al. Found that the temperature sensitivity of the respiration of microorganisms in Alaska tundra from the litter layer to the fermentation layer and to the humus