Analysis Based On Stability Of Ecosystem In Wolong Lake Wetland And Evaluation

Wolonghu wetland locates in west part of Kangping County, the far north of Shenyang city and the border of Liaoning, Jilin and Inner Mongolian provinces. The wetland is16.5km long and53km wide, and112km2of area. During recent years, the wetland experienced a great degradation of loss in biodiversity, reduction of ecological functions and so on owing to the disturbance from mankind and natural environments, which limits the sustainable development of local economy and impacts the natural environments of Shenyang city, which would surely threat the ecological stability of the wetland. And therefore, the study on the ecological stability of Wolonghu wetland is to be significant help the restoration of ecological functions of the wetland.Ecological stability is one of the highlight features which indicate the status of the structures and functions of an ecosystem, which includes the ability of resistance to the disturbance from outside and renewable ability from degradation state. The estimation of ecological stability is a kind of mean to investigate, analyze and judge the status of an ecosystem basing on some criteria, which is to be great help the restoration and management activities.Firstly, some historical data and documents about Wolonghu wetland have been analyzed. Secondly, the dynamic change trend of the wetland has been analyzed, especially the adjusting ability of water storage, from the spatial and temporal angles. And finally, the current status such as biodiversity and water quality driven by climate changes has been analyzed.Basing on sufficient consideration and analysis of eco-status and social and economic state of around the wetland, combining referring to the results worldwide ecological stability and some new theories of modern ecology and environmental engineering, the estimation index system has been set up. The system can be classified into three categories such as functional, ecological and social-economic index, which including25items, such as hydrological adjusting, soil property, wetland management level and etc. And in this paper, the data from the index have been treated by means of AHP method to make sure the validity of the corresponding data.By using the SPA theory, a new estimation method of ecological stability of Wolonghu wetland has been put forward. And a method of partition the grade of the ecological stability of Wolonghu wetland basing on the relative number was utilized to make sure the ecological stability. And the estimation results showed that the potential of SPA belonged to weak reverse one. The status of stability of the wetland can be meliorated by reinforcing the environmental management level.A new dynamic estimation method combining the state and trend analysis has been proposed, by which the trend of Wolonghu wetland ecological stability has been estimated and forecasted from the angle of development. And especially, the state of2008of the wetland was forecasted to be "not stable of first class". And from the state chart we can concluded that the stability of the wetland is to be better by strengthen management.The main factors which impact the ecological stability of Wolonghu wetland have been analyzed basing on the collective estimation results. And consequently, some corresponding countermeasures have been put forward, including setting up water environmental management systems, as ecological stability monitoring, state estimation, investment and management systems, laws and regulations systems and etc.