土壤呼吸和有机碳对增温的响应及其影响因素分析

Responses of Soil Respiration and Organic Carbon to Warming and Their Influencing Factors

增温是影响土壤呼吸和有机碳变化的一个重要因素,但近年来关于增温对土壤呼吸和有机碳影响的研究结果存在不一致的情况。本研究利用从国内外已发表的128篇研究论文中提取的有效数据进行Meta分析,探讨了增温对土壤呼吸和有机碳的影响。结果表明:(1)增温促进了土壤二氧化碳的排放并降低了土壤有机碳的含量,增温对土壤呼吸的影响程度(11.7%)明显大于对土壤有机碳的影响程度(4.4%)。(2)相较于其他生态系统,增温对森林生态系统的土壤呼吸和有机碳的影响程度最小,分别为9.3%、4.1%。(3)土壤呼吸对增温的响应与增温幅度之间呈二次负相关,且<2℃的增温对土壤呼吸和有机碳的影响最大;增温时间的延长不利于土壤碳的释放,土壤呼吸作用随着增温时间延长对温度升高产生了一定的适应性。以上研究结果进一步强化了增温对土壤呼吸和有机碳影响的理解。

Warming is an important factor that affects soil respiration and organic carbon changes.However,in recent years,there are inconsistencies in the research results on the effects of warming on soil respiration and organic carbon.This study uses valid data extracted from 128 research papers published at home and abroad to conduct a Meta-analysis to explore the effects of warming on soil respiration and organic carbon.The results show that:(1)Warming promotes the emission of soil carbon dioxide and reduces the content of soil organic carbon.The degree of influence of warming on soil respiration(11.7%)is significantly greater than that on soil organic carbon(4.4%);(2)Compared with other ecosystems,warming has the smallest impact on the soil respiration and organic carbon of forest ecosystems,which are 9.3%and 4.1%respectively;(3)There is a negative correlation between the response of soil respiration to warming and the extent of warming,and warming<2℃has the greatest impact on soil respiration and organic carbon.The extension of warming time is not conducive to the release of soil carbon.Soil respiration has a certain degree of adaptability to temperature rise with the prolonged warming time.The above research results further strengthen the understanding of the effects of warming on soil respiration and organic carbon.