Author(s): Xiaokang Xin; Bin Xiong; Jian Yan; Jian Li; Xiaomin Tian
Linked Author(s):
Keywords: Wangfuzhou Reservoir; Elodea nuttallii; Ecological regulation; Effectiveness evaluation
Abstract: In order to scientifically and effectively control the excessive growth of Elodea nuttallii in the section from Danjiangkou to Wangfuzhou of Hanjiang River, and to study the implementation effect of ecological regulation, the biomass survey method, distribution area statistics method, and mathematical model simulation method were used to analyze and evaluate the changes in total biomass, distribution area before and after the implementation of ecological regulation. Meanwhile, the demand for the flow discharge of Danjiangkou Reservoir was studied. The results showed that after implementing ecological regulation for 3 years, the total biomass of Elodea nuttallii decreased from 48000 tons in 2019 to 40.11 tons in 2022, and the distribution area decreased from 11.60 km2 to 0.23 km2, with a decrease of over 95%. The proportion of Elodea nuttallii biomass in the total biomass of submerged plants decreased from 99.99% to 17%, indicating a good ecological regulation effect. In spring, ecological regulating should focus on moderate interference by increasing the extreme flow ratio, while in summer or autumn, ecological regulating should focus on high flow velocity erosion by meeting the critical flow velocity of 0.14m/s.
Year: 2024