生态学报2024，Vol.44Issue(5)：1918-1927,10.DOI:10.20103/j.stxb.202304280900
大兴安岭多年冻土区两种水体温室气体浓度动态与冬季储存特征
Greenhouse gas concentration dynamics and winter storage characteristics of two water bodies in the permafrost zone of the Great Hing'an Mountains
摘要
Abstract
Boreal inland waters are hotspots for greenhouse gas emissions,and they play an important role in quantifying the regional carbon budget,but seasonal variations in their emissions are not well understood.In this study,we observed the concentration of carbon dioxide(CO2)and methane(CH4)trapped in the ice during the ice cover period of the Fukuchi River and its diverted oxbow lakes(late successional stage)in the permafrost zone of the Great Hing'an Mountains.Differences in dissolved CO2 and CH4 concentrations in the two water bodies during three periods(ice cover period,open water period,and spring thaw period)were also compared.The results showed that there were differences in the seasonal variation patterns of dissolved CO2 and CH4 concentrations in the two water bodies.Concentrations of dissolved CO2 and CH4 were highest in the water column of oxbow lakes during the ice cover period.There was a significant accumulation of CO2 and CH4 under the ice layer.The mean dissolved CH4 concentration in the water column was(2.21±0.54)μmo/L,which was 5 and 14 times higher than the CH4 concentration during the open water and spring thaw periods,respectively.River had the highest dissolved CO2 and CH4 concentrations in the water column during the spring thaw period,which were significantly higher than during the open water period and ice cover period(P＜0.05).Dissolved CO2 and CH4 in water were influenced by various environmental factors and were positively correlated with dissolved organic carbon(DOC)(P＜0.05)and negatively correlated with dissolved oxygen(DO)and water temperature(P＜0.05).CO2 and CH4 were also trapped within the ice as bubbles when the ice formed during the ice cover period.CO2 was the main component in bubbles,with concentrations of about 90%or more within the bubbles.As CO2 and CH4 concentrations in bubbles are about 1%—30%of those in the water column under the ice,ignoring the greenhouse gases stored in the ice would increase the uncertainty of carbon emissions from boreal inland waters.This study clarified the seasonal characteristics of dissolved CO2 and CH4 and the winter storage capacity of two water bodies in the Great Hing'an Mountains permafrost region.The results provide important data to understand carbon cycling processes in the water bodies of this region.关键词
溶解CO2和CH4浓度/冰层覆盖时期/内陆水域/冰气泡Key words
dissolved CO2 and CH4 concentration/ice cover period/inland water/ice bubbles引用本文复制引用
薛璟,陈辛安,王宪伟,孙晓新..大兴安岭多年冻土区两种水体温室气体浓度动态与冬季储存特征[J].生态学报,2024,44(5):1918-1927,10.基金项目
中央高校基本科研业务费项目(2572020BA06,2572021DS04) （2572020BA06,2572021DS04）
黑龙江省自然科学基金联合引导项目(LH2020C033) （LH2020C033）
国家自然科学基金项目(31870443) （31870443）
