Study on biomass dynamics of Phragmites communis community in Panjin wetland

Based on the biomass observation data of Phragmites communis community in Panjin wetland during growing season in 2005,the characteristics of its biomass were analyzed.The maximum value of aboveground biomass appeared in July.There was significant positive correlation between the weights of the stem and leaf from April to July.The belowground biomass presented obviously seasonal and vertical changes.The maximum values of fibre biomass and rhizome biomass from the depth of 0 to 30 cm appeared in July and in June,respectively.The soil depth of 30～40 cm could be taken as a shift depth of the vertical distribution of Phragmites communis belowground biomass.The value of root-shoot ratio was the lowest in July,and the nutriment accumulated under the soil depth of 30 cm.