Status Quo of Wuliangsuhai Lake's Water Quality and Its Impacts on the Spatial Variability of Large Submerged Plants' Biomass

摘要

In July 2011,the water quality monitoring along with the submerged plants sampling at fixed sites were conducted on the Wuliangsuhai to analyze the status quo of its water quality and the impacts it may have on the spatial variability of large submerged plants' biomass.The revised Carlson Index were used to evaluate the degree of eutrophication of the lake,the result of which indicated that most areas of Wuliangsuhai were in the state of eutrophication and their water fell into Category V,based on the National Standards (GB 3838-2002) for Surface Water Quality.Also,the cluster analysis was used to classify the state of water at various sampling sites,the result of which showed that conspicuous spatial variability existed in the water of the lake; its quality gradually turned better from the inlet to the outlet,and water quality near the inlet and area with no water exchange was the worst,while that the area near the outlet was the best.Submerged plants on the Wuliangsuhai were characterized by only one category and great biomass.Moreover,the MLR analysis was used to analyze the relationship between the spatial distribution of large submerged plants and hydrologic parametersThe huge biomass of Wuliangsuhai's submerged plants was related with the lake's water quality to a large extent,particularly,the eutrophication of the lake had accelerated the growth of submerged plants,and hence,the improvement of its water quality is essential to their normal growth.