土壤有机碳和氮分解对温度变化的响应趋势与研究方法

Responses of soil organic carbon and nitrogen decomposition to changing temperature and related research methods: A review.

总结了土壤中碳和氮贮量与温度的关系、土壤碳和氮分解对温度时空差异和直接加热升温的响应,以及土壤碳和氮分解对低温冻结及冻融循环的响应趋势,讨论了其研究方法的误差和不确定性,并对今后的研究提出了一些建议.气候变暖在短期内将使土壤碳和氮分解加速并引起CO2释放量增加,而长期过程中却并不一定会引起土壤碳和氮分解加速.合理解释不同研究结果的差异,除了需要系统分析土壤碳和氮分解对温度变化响应的机制外,还需要充分认识土壤碳和氮分解对温度变化响应的长期过程和短期过程的差异,以及研究方法、植被、土壤和气候等因素的影响.

In this paper, the researches about the relationships of soil carbon and nitrogen storage with temperature, and the responses of soil carbon and nitrogen decomposition to the spatiotemporal differentiation of temperature, increasing air temperature, and soil freezing-thawing were summarized, and the uncertainty and determination errors of related research methods were discussed. Climate warming could promote soil carbon and nitrogen decomposition and soil CO2 emission within a short period, but not always accelerate the decomposition of soil carbon and nitrogen in a long term. Therefore, to give a reasonable interpretation on the discrepancies of previous studies, a systematic analysis on the mechanisms about the effects of changing temperature on the decomposition of soil carbon and nitrogen should be made, and the differences about the long-term and short-term responses of soil carbon and nitrogen decomposition to the changing temperature, as well as the influences of research method, vegetation, soil, and climate conditions on the research results should also be fully understood.