Open AccessEffects of sediment content changes on the growth of phytoplankton in Dongting Lake
Author(s) -
Kai Wang
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/675/1/012044
Subject(s) - eutrophication , environmental science , sediment , phytoplankton , three gorges , hydrology (agriculture) , yangtze river , chlorophyll a , algal bloom , biomass (ecology) , water level , nutrient , ecology , oceanography , geology , geography , biology , paleontology , botany , geotechnical engineering , cartography , archaeology , china
After the construction of the Three Gorges Dam(TGD) on the Yangtze River, the reservoir’s regulation and storage for upstream flow and downstream river channel erosion (caused by the discharge of clear water) led to a significant reduction in the amount of sediment entering Dongting Lake from the Yangtze River. The decrease in sediment entering the lake led to a decrease in sediment content and an increase in lake transparency. These factors caused the growth of algae in Dongting Lake, and the level of lake eutrophication increased. Based on the AQUATOX aquatic ecology model, this study analyses the responses of phytoplankton and chlorophyll a in each area of Dongting Lake and the changes in the nutritional status of the water body under the scenario of the continuing decline in sediment content while other factors remain unchanged. The results show that as the sediment content decreases, the biomass of phytoplankton and the content of chlorophyll a will show increasing trends in each area of Dongting Lake. In this case, eutrophication will continue to develop in Dongting Lake.