土壤模拟增温装置对碳排放监测的影响分析

Analysis of the Impact of Soil Simulation Warming Devices on Carbon Emission Monitoring

在全球气候变暖的环境下,土壤碳的微弱变化会对陆地生态系统碳循环产生较大的影响,进而对未来气候变暖产生正反馈。目前全球开展了许多有关野外原位模拟增温的实验,主要集中在土壤碳排放与土壤微生物对增温的响应方面。在研究过程中,不同增温装置的增温效果、增温时间以及增温实验开展地点上的差异对研究结果带来的影响不容忽视。基于以往全球气候变化研究的相关成果,本文系统总结了常用增温装置的特点及不足,研究结果表明:(1)在条件允许的情况下,主动增温装置的可控性与增温效果较好,主动增温的效果优于被动增温;(2)大部分增温实验的持续时间集中在1~5年,且增温装置的增温效果仅局限于浅层土壤,建议开展长时间尺度与深层土壤增温实验;(3)增温实验多集中于北半球中高纬度和高海拔地区,未来可以在热带、亚热带地区开展更多的野外原位增温实验;(4)未来应将增温、氮沉降、降雨变化以及CO_(2)倍增实验结合起来,探究不同全球变化因子间的交互作用对陆地生态系统碳循环的影响。研究结果对后续全球气候变化的相关研究具有一定的参考价值。

Under the global warming environment,minor changes in soil carbon will have large impacts on the carbon cycle in terrestrial ecosystems,which in turn positively feedbacks on the future climate warming.Currently,many field experiments on the in-situ simulation of warming have been carried out worldwide,mainly focusing on the soil carbon emission and soil microbial response to warming.During the research process,the effect of different warming devices,warming times and locations of warming experiments cannot be ignored.Based on the related research results of the global climate change,this paper summarized some commonly used warming device settings and characteristics,and results of this study show as follows.(1)Active warming is more effective than passive warming due to the controllability of active warming devices and the better warming effect.(2)Most warming experiments last for 1~5 years and the effect of warming devices is only limited to the shallow-soil,and therefore long-term and deep-soil warming experiments should be carried out in the future.(3)Most warming experiments are concentrated in mid-high and high altitude areas of the northern hemisphere,and more field in-situ warming experiments can be conducted in tropical subtropical areas in the future.(4)Warming,nitrogen deposition,rainfall changes,and CO_(2) doubling experiments should be combined in the future to investigate the effects of interactions among different global change factors on the carbon cycle in terrestrial ecosystems.This work provides method instruction for the global climate change in the future,and is of important scientific significance.