Study of the Problems and Countermeasures in the Ecosystem of Dongting Lake Wetland

The Dongting Lake wetland is one of largest,lacustrian wetland in China.Because of the mud filling up,the cubage of Dongting Lake has been cut down obviously,the level of flood has been droved up,and relation of the lake and rive has been changed.The burden of prevent of control flood in Dongting Lake has been embittered;the disaster has been aggravated;the capability of water self-purification has been reduced.Inasmuch as all of this negative influence,the ecosystem of Dongting Lake wetland is degenerating.In this paper,the function of the ecosystem of Dongting Lake wetland was discussed.Then,the factors of degeneration have been found,and aiming at the factors,a series of measures have been advanced.