Estimation on carbon sequestration of aboveground part of phragmites australis around chongming island

This work investigated biomass and primary productivity of aboveground part Phragmites australis which encircles Chongming Island based on field investigation and laboratory measurements from March to October, 2011, surveyed environmental factors simultaneously to analyzing and estimating carbon sequestration of aboveground part of Phragmites australis. The results indicated that carbon fixation ability of aboveground part of Phragmites australis around Chongming Island was about 0.28-1.02 kg/(m²·a), at an average of (0.67 ±0.19) kg/(m²·a), compared lower than those of conservation districts in Changjiang River Estuary (Eastern Tidelands of Chongming Island and Hangzhou Bay) but much higher than that of conservation area in Yellow River delta. The main factors which effected on vegetation process were disastrous weather and human disturbance, and above ground biomass (p = 0.021) and density (p = 4.6 × 10^-6) in the harvested area were higher significantly than that of the intact area. The distribution of Phragmites australis in Chongming Island mainly limited by soil salinity, which was also related closely to the phenotypes of Phragmites australis along with anthropogenic interference. The mid-to-late period of vegetation process was the critical period when environmental factors act. The management and protection with reasonable utilization of Phragmites australis were quite essential.