生态学报2018，Vol.38Issue(2)：668-677,10.DOI:10.5846/stxb201610302213
博斯腾湖人工和天然芦苇湿地土壤CO2、CH4和N2O排放通量
Emission fluxes of CO2, CH4, and N2O from artificial and natural reed wetlands in Bosten Lake, China
摘要
Abstract
CO2,CH4,and N2O,have strong warming potentials and are considered to be the primary greenhouse gases in the atmosphere.Global warming caused by the increasing concentrations of atmospheric CO2,CH4,and N2O is one of the hotspots in global change field.Greenhouse gas (GHG) fluxes in reed wetlands are critical in evaluating the source/sink strength of GHG in arid area.We studied the dynamics of soil CO2,CH4,and N2O fluxes using static chamber-based on gas chromatography in two reed wetlands of the freshwater Bosten Lake,located in an arid area of Northwestern China.During a full year of monitoring,environmental variables (including soil moisture,soil temperature,air temperature,pH and salinity) were measured to determine the effects of abiotic factors on soil CO2,CH4,and N2O fluxes in artificial and natural reed wetlands.SPSS 19.0 for Windows was used to analyze the relationships between environmental factors and soil CO2,CH4,and N2O fluxes.The results showed that soil CO2,CH4,and N2O fluxes in the artificial reed wetland were 10.1-588.4mg m-2 h-1,1.32-29.7μg m-2 h-1 and 3.1-64.8μg m-2 h-1,respectively,which was comparable with the values from the natural reed wetland.Higher soil CO2 emissions occurred in summer,whereas CH4 and N2O emissions mainly occurred in late spring and early summer.Temperature was the main factor controlling soil CO2 and N2O fluxes in both reed wetlands (P ＜ 0.01).Soil CH4 emission flux was affected by both temperature and moisture.According to regression analysis,the combination of near-surface temperature,top 5cm soil temperature,and soil water content could explain 71％ and 74.5％ of soil CH4 flux in artificial and natural reed wetlands,respectively.Soil organic carbon,pH,salinity,NH4+-N,and NO3--N are also influencing factors of CO2,CH4,and N2O fluxes in artificial and natural reed wetlands.However,the differences in CO2,CH4,and N2O emissions from soils of artificial and natural reed wetlands were caused by differences in soil organic carbon,soluble nitrogen,and biomass.Based on the centennial scale,the soils of artificial and natural reed wetland were " sources" of GHG,and the global warming potential from artificial reed wetland was higher than that from natural reed wetland.关键词
芦苇湿地/土壤/温室气体/全球增温潜势/博斯腾湖Key words
reed wetland/soil/greenhouse gases/global warming potential/Bosten lake引用本文复制引用
王金龙,李艳红,李发东..博斯腾湖人工和天然芦苇湿地土壤CO2、CH4和N2O排放通量[J].生态学报,2018,38(2):668-677,10.基金项目
新疆维吾尔自治区重点实验室专项基金项目(XJDX0909-2014-05) （XJDX0909-2014-05）
新疆师范大学硕士研究生科技创新项目(XSY201602002) （XSY201602002）
