若尔盖高原泥炭沼泽二氧化碳、甲烷和氧化亚氮排放通量研究  

Emission Fluxes of Carbon Dioxide,Methane and Nitrous Oxide from Peat Marsh in Zoigê Plateau

作　　者：王德宣[1] 

机构地区：[1]中国科学院湿地生态与环境重点实验室,中国科学院东北地理与农业生态研究所,吉林长春130012

出　　处：《湿地科学》2010年第3期220-224,共5页Wetland Science

基　　金：国家重点基础研究发展计划项目(K09M21);中国科学院知识创新工程重大项目(KZCX1-SW-01-06)资助

摘　　要：2003～2005年,在每年的植物生长季,采用静止箱/气相色谱法,观测和计算了若尔盖高原泥炭沼泽温室气体CO2、CH4和N2O的排放通量。若尔盖高原泥炭沼泽平均CO2排放通量为203.22mg/(m2.h),分别是沼泽化草甸平均CO2排放通量[348.31mg/(m2.h)]的58%和放牧草场平均CO2排放通量[323.03mg/(m2.h)]的62%;若尔盖高原泥炭沼泽平均CH4排放通量为2.43mg/(m2.h),分别是沼泽化草甸平均CH4排放通量[0.29mg/(m2.h)]的8.4倍和放牧草场平均CH4排放通量[0.07mg/(m2.h)]的34倍;若尔盖高原泥炭沼泽平均N2O排放通量为0.020mg/(m2.h),低于沼泽化草甸平均N2O排放通量[0.037mg/(m2.h)]和放牧草场平均N2O排放通量[0.056mg/(m2.h)]。Zoigê plateau（32°20＇N-34°5＇N,102°E-103°30＇E）,located in northern Sichuan province and southern Gansu province in China,covers an area of 180×10 4 ha in which the area of 46×10 4 ha belonging to peat marsh.In the peat marsh,major plants are Carex muliejsis,Carex meyeriana and Carex enervis etc.with a peat layer of 2-5 m below plants.Zoigê peat marsh is the largest one in the Tibet Plateau peat marshes.With closed chamber and GC technique,a study was done on CO_ 2,CH_ 4,N_ 2 O fluxes in the peat marsh,marsh meadow and grassland during the plant growth period in 2003,2004 and 2005.The mean CO_ 2 flux for 3 years was 203.22 mg/（m 2 ·h）in peat marsh,348.31 mg/（m 2 ·h）in marsh meadow and 323.03 mg/（m 2 ·h）in grassland.The CO_ 2 flux in peat marsh is 58% of that in marsh meadow and 62% of that in grassland,which provided a evidence of peat marsh as carbon sink.The mean CH_ 4 flux for 3 years was 2.43 mg/（m 2 ·h）in peat marsh,0.29 mg/（m 2 ·h）in marsh meadow and 0.07 mg/（m 2 ·h）in grassland.The CH_ 4 flux in peat marsh was 8.4 times of that in marsh meadow and 34 times of that in grassland,which showed peat-marsh was an important atmospheric CH_ 4 source.The mean N_ 2 O flux for 3 years was 0.020 mg/（m 2 ·h）in peat marsh,0.037 mg/（m 2 ·h）in marsh meadow and 0.056 mg/（m 2 ·h）in grassland.The N_ 2 O flux in peat marsh for 3 years was lower than that in marsh meadow and grassland.Under background of global warming,along with large-area degradation of marsh,emission of greenhouse gases from plateau marsh also had a response that the atmospheric CO_ 2 sink function and atmospheric CH_ 4 source function of marsh was largely weakened.

关 键 词：温室气体 排放通量 泥炭沼泽 若尔盖高原 

分 类 号：X16[环境科学与工程—环境科学]