三江平原湿地CH_4排放通量研究  

Study of CH_4 Emission From Wetlands in Sanjiang Plain

作　　者：郝庆菊[1] 王跃思[1] 宋长春 刘广仁[1] 王毅勇[2] 王明星[1] 

机构地区：[1]中国科学院大气物理研究所,北京100029 [2]中国科学院东北地理与农业生态研究所,长春130012

出　　处：《水土保持学报》2004年第3期194-199,共6页Journal of Soil and Water Conservation

基　　金：中国科学院知识创新工程重大项目"中国陆地和近海生态系统碳收支研究"(KZCX1-SW-01)

摘　　要：2002年6月到10月在三江平原利用静态暗箱-气相色谱法对不同土壤水分状况或积水深度的毛果苔草沼泽、小叶章草甸以及灌丛进行了CH4排放的测定,结果为毛果苔草沼泽CH4排放通量(11.9mg/m2.h)>小叶章草甸(8.5mg/m2.h)>灌丛(0.75mg/m2.h),差异达到高度显著水平(α=0.01),主要是由土壤水分状况不同而造成的。由于生境的差异,3种湿地类型CH4排放通量的季节变化形式也不尽相同。温度、土壤Eh和毛果苔草生物量是影响CH4排放的重要因素,湿地CH4排放通量和箱内外温度或不同深度的地温均呈显著或极显著正相关,小叶章草甸和毛果苔草沼泽分别与10cm及15cm的Eh呈极显著负相关(P<0.01),毛果苔草生物量和CH4排放通量呈显著正相关(P<0.05)。CH_4 emission fluxes were measured in the Sanjiang Plain by static opaque chamber-GC technique during June to October in 2002. According to soil moisture and water table position, three sits were selected including Carex lasiocarpa marsh, Calamagrostis angustifolia meadow and shrub. The results indicated that CH_4 flux was Carex lasiocarpa marsh (11.9 mg/m^2·h)> Calamagrostis angustifolia meadow (8.5 mg/m^2·h)> shrub ((0.75) mg/m^2·h), the difference of CH_4 fluxes among the three sites was markedly (α=0.01). This difference was mainly caused by soil moisture. Because of differences of environment, the seasonal variation in methane emission from the three wetland ecosystems were not same. Temperature, Eh and plant were important factors influencing CH_4 emission. There were positive relationships between CH_4 fluxes and temperatures. In Calamagrostis angustifolia meadow and Carex lasiocarpa marsh, CH_4 fluxes were negatively correlated with 10 cm and 15 cm soil Eh values respectively. And in Carex lasiocarpa marsh CH_4 flux was positively correlated with plant biomass.

关 键 词：三江平原 湿地 CH4 排放通量 

分 类 号：S153[农业科学—土壤学]