摘要
森林土壤是最有效的大气甲烷(CH_(4))的陆地生物汇,大气CO_(2)浓度升高、增温、降雨格局改变和氮沉降增加等全球变化通过影响土壤理化性质、植物生长和土壤微生物等,进而影响土壤CH_(4)的吸收。本研究通过Meta分析综述了全球变化因子对森林土壤吸收CH_(4)的潜在影响。基于全球不同区域的155篇公开发表文章的195组数据发现:在CO_(2)浓度升高和N沉降增加情况下,森林生态系统吸收CH_(4)的速率显著降低;在干旱条件下,土壤CH_(4)吸收率显著增加。本文没有发现热带、温带和北方森林在年尺度上的CH_(4)吸收率明显不同。在森林土壤中,温度升高对CH_(4)吸收速率的正向作用不明显,相应的自然对数响应比表明,全球气候变暖不会直接对森林CH_(4)吸收率产生显著影响。本研究收集的森林土壤CH_(4)吸收季节性和干旱实验的结果证明了土壤水分对CH_(4)吸收具有显著负相关作用,但本文拟合的土壤水平衡的CH_(4)吸收线性模型并没有体现出土壤水分盈余对土壤CH_(4)吸收的负相关性。该结果表明,土壤水平衡模型在应用到全球尺度上时,需要收集更多的实验数据。同时,本研究结果对未来开展全球变化对森林土壤CH_(4)吸收影响的相关实验有一定参考意义。
Forest soils are the main sink of atmospheric methane(CH_(4)) in the terrestrial ecosystems.Global changes,such as increasing atmospheric CO_(2) concentration,warming,changing rainfall regime,and increasing nitrogen(N) deposition,affected soil CH_(4) uptake by altering soil physicochemical properties,plant growth,and soil microorganisms.In this study,we conducted a meta-analysis of the impacts of global changes on CH_(4) uptake in forest soils.Based on 195 sets of data collected from 155 papers,we found that the rate of CH_(4) uptake by forests decreased significantly under elevated CO_(2) and N deposition,but increased under drought.There were no significant differences in CH_(4) uptake rates at the annual scale in tropical,temperate,and boreal forests.Global warming did not affect CH_(4) uptake rates in forest soils.Moreover,the results of seasonal and drought experiments on forest soil CH_(4) uptake demonstrated that soil moisture was negatively correlated with CH_(4) uptake.The linear model of CH_(4) uptake in soil water balance fitted in this study did not reflect the negative correlation between soil water surplus and soil CH_(4) uptake.These results indicate that soil water balance model requires more empirical data when it is applied at the global scale.Our results shed light on future experiments related to the impacts of global change on CH_(4) uptake in forest soils.
作者
韩诗慧
刘蕾
周国逸
李琳
方雪纯
HAN Shihui;LIU Lei;ZHOU Guoyi;LI Lin;FANG Xuechun(Nanjing University of Information Science&Technology,Nanjing 210044,China)
出处
《生态学杂志》
CSCD
北大核心
2023年第12期3030-3037,共8页
Chinese Journal of Ecology
基金
国家自然科学基金重点项目(42130506)
南京信息工程大学人才启动经费资助项目(2019r065)资助。
