Effects of Artificial Water Supply on Phragmites australis Growth in Zhalong Wetland
Shoot height, shoot density and aboveground biomass of reeds ( Phragmites australis ) were measured 5 days before artificial water supply and 10, 20 and 30 days after water supply in flooded and unflooded areas in Zhalong Wetland during May-June 2009. Each control group was set up separately in contrast to the flooded and unflooded areas in order to eliminate the effects of other environmental factors on the growth of reeds. Results showed that shoot height and aboveground biomass of the reeds in the flooded area were higher than those in the unflooded area, and shoot density of the reeds in the flooded area was lower than that in the unflooded area 5 days before the artificial water supply. Artificial water supply resulted in an increase in shoot height, shoot density and aboveground biomass, and the increments of shoot height, shoot density and aboveground biomass of the reeds in the flooded area were 12 cm, 112 ind · m-2 and 193 g · m-2 respectively, and those of the reeds in the unflooded area were 8 cm, 11 ind · m-2 and 66 g · m-2 respectively. Thirty days after artificial water supply,shoot height, shoot density and aboveground biomass of the reeds in the flooded area were the highest, followed by the control of flooded area, the unflooded area and the control of unflooded area. Correlation analysis indicated that there was no significant relationship between total nitrogen, total phosphorus and shoot height, shoot density and aboveground biomass of the reeds.
Zhalong wetlandArtificial water supplyPhragmites australisGrowth
NETL
NSTL
万方数据
维普
