Study on the Relation of Plant Biomass and CH4, N2O Emission in the Wetland of Sanjiang Plain
自然沼泽湿地生物量与CH4、N2O排放量关系初步研究

In this study,we explored relationships between plant biomass and emission of greenhouse-gases.The biomass of different plant communities(Deyeuxia angustifolia,Carex lasiocarpa and Carex pseudocuraic) and emission of CH_4,N_2O were studied in the typical freshwater wetland in Sanjiang Plain from June to September,2003.The result suggests that the season variations of the aboveground biomass can be described by parabola model Y=a bT cT~2.The emission of CH_4 showed strong difference in the plant zones and the trend is reduction from center to brim in the Sanjiang Wetland.The emission of N_2O of communities expresses the trend of "up-down-up".But the first time of the top emission is earlier in the Deyeuxia angustifolia than Carex lasiocarpa and Carex pseudocuraic distinctly.Analyses show that the biomass of different plant community has the strong linear relation with the cumulated emission of CH_4,N_2O before the plant reaches its largest aboveground biomass during growing seasons.And it can be described by function Y=aX b,and their R~2 were almost over 0.89.