水位下降对若尔盖泥炭地垂直剖面土壤甲烷产生及厌氧氧化潜势的影响  

Effect of water table drawdown on soil methane production and anaerobic oxidation potential in the vertical profile of Zoige peatland

作　　者：刘俊霞 薛丹[1,2] 黄新亚[1,2,3] 刘建亮 高永恒[1,2] 陈槐[1,2,4] LIU Junxia;XUE Dan;HUANG Xinya;LIU Jianliang;GAO Yongheng;CHEN Huai(Chinese Academy of Sciences Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041,China;Zoige Peatland and Global Change Research Station,Chinese Academy of Sciences,Hongyuan 624400,China;University of Chinese Academy of Sciences,Beijing 100049,China;CAS Center for Excellence in Tibetan Plateau Earth Sciences,Beijing 100101,China)

机构地区：[1]中国科学院成都生物研究所山地生态恢复与生物资源利用重点实验室,成都610041 [2]中国科学院若尔盖泥炭地定位研究站,红原624400 [3]中国科学院大学,北京100049 [4]中国科学院青藏高原地球科学卓越创新中心,北京100101

出　　处：《生态学报》2021年第13期5317-5327,共11页Acta Ecologica Sinica

基　　金：国家自然科学基金项目重大研究计划(No91851108);国家自然科学基金面上项目(No31570480);中国科学院前沿科学重点研究项目(QYZDB-SW-DQC 007)。

摘　　要：泥炭地是主要的甲烷(CH_(4))排放源,甲烷循环过程对水位变化响应敏感。研究选取两块具有水位差异的泥炭地土壤,通过厌氧培养实验探究水位变化对泥炭地甲烷产生和甲烷厌氧氧化(Methane Anaerobic Oxidation, AOM)潜势的影响,并分析影响其潜势大小的生物地球化学因子。结果显示,高水位泥炭地(0 cm)CH_(4)产生累积量为(0.89±0.01)μg/g,要显著高于低水位(-30 cm:(0.70±0.03)μg/g)泥炭地甲烷产生量,但低水位AOM累积量要显著高于高水位泥炭地(0 cm:(2829.93±35.99)μg/g),低水位泥炭地AOM量为(3588.06±24.78)μg/g。通过相关性分析发现甲烷产生潜势与含水量和DOC具有显著相关性,AOM潜势与含水量、pH、DOC具有显著相关性,含水量和DOC是影响若尔盖泥炭地甲烷产生及AOM潜势大小的重要因子。此外,发现高水位泥炭地甲烷产生潜势对温度升高的响应较为明显,特别是表层土壤(0—20 cm)。本研究明确了水位变化对若尔盖泥炭地甲烷产生及AOM潜势的影响特征,估算了全国泥炭地甲烷产生及AOM潜势的大小,以期为减缓全球气候变暖提供一定的理论支撑。Peatland is one of main sources of methane(CH_(4))emissions,and the process of methane cycle is sensitive to the change of water table.In this paper,soil from two peatlands with the differed water table were cultivated without oxygen to explore the effects of water table change on methane production potential and methane anaerobic oxidation(AOM)in peatland and analyze the potential impact biogeochemical factors.Results showed that CH_(4) production from high water table peatland(water table=0 cm:(0.89±0.01)μg/g)was significantly higher than that from low water table(water table=-30 cm:(0.70±0.03)μg/g)peatland.The AOM in the low water table peatland((3588.06±24.78)μg/g)was significantly higher than that in the high water table peatlands((2829.93±35.99)μg/g).The correlation analysis showed that methane production potential is significantly correlated with water content and DOC,and the AOM potential is significantly correlated with water content,pH and DOC.Water content and DOC are important factors affecting the methane production and AOM of the Zoige peatland.Our results also showed that the methane production potential at high water table peatland was significantly sensitive to warming,especially at surface soil(0—20 cm).This study clarified the influence of water table on methane production and AOM potential of Zoige peatland,estimated the methane production and AOM potential of peatlands from nationwide,and provided theoretical support in mitigating global change.

关 键 词：甲烷产生 甲烷厌氧氧化 潜势 泥炭地 生物地球化学因子 

分 类 号：S154.1[农业科学—土壤学]