Abstract:

The wetland vegetation is gradually degrading in Poyang Lake due to the influence of climate change and human activities, the area of wetland vegetation have reduced 600 km2 since 2003 when state of low water level remain in the Poyang Lake. Since the soil water content decrease, the xerophytes invade and the plant species increase significantly occupying the lake beach above the elevation of 15 m. The wetland plants and aquatic plants down to the lake center resulting in reduced growth space. The plants which are sensitive to water depth and pollutants are disappearing leading to the reduction of the plant biomass and biological diversity. The plants which are resistant to water pollution rapidly expand because the water in the lake is shallow. The disorder of sand mining, vegetation incineration and animals grazing aggravate this situation. In order to curb the phenomenon of wetland vegetation degradation in the Poyang Lake, the evaluation system and evaluation standard of wetland ecosystem health in the Poyang Lake are establishing. Changes of plant community in the existing cross section will be monitored. The rare species, the species sensitive to water depth and pollutant will be monitored. The vegetation change situation in the lake will be determined using remote sensing image recognition and field survey. Finally, the prevention and control countermeasures are putting forward