Assessing On The Ecological Environment Vulnerability Of Poyang Lake Typical Wetland

Since 1960's, the global fragile ecosystem area extends obviously, and the degree aggravates as well, as a result caused widespread concern. Since the concept of Ecotone was defined in 1988, ecological fragility having been one of foucal studies in the science of environment and geography and other relative subjects.Poyang Lake is the biggest fresh lake in China and an important international wetland, the wetland ecosystem balance in Poyang lake valley has been affected because of the rapid economic development , social progress and human activities, which aggravate wetland ecological vulnerability and deteriorate ecological problem. During the last decades, many researchers studied the wetland ecosystem formation, evolution and resource distribution of Poyang Lake wetland, and have accumulated abundant data information, however, take little pain on the current vulnerability situation and development trend by these data information. By studying on Poyang Lake ecological vulnerability, this paper tries to state the essential characters of Poyang Lake wetland to promote wetland restoration and protection, wetland planning and management, provide scientific evidence for regional sustainable development.This paper studies the typical wetland of Poyang Lake, which is located in the northwest of Poyang Lake, converged between Gan river and Xiu river, (115° 55' -116° 03' E, 29° 05' -29° 15' N). It covers 336 km~2 including three counties (Yongxiu county, Xinzi county, Xinjian county) and nine lakes even surrounding swamp, Wucheng town of Yongxiu county is its center. Focusing on the pressure on Poyang Lake typical wetland, by field studies, data collection, combining quantitative and qualitative methods, it uses a "Pressure-State-Response" (P-S-R) frame model to analyze the ecological vulnerability of typical wetland. In terms of purpose, integrity, dominance, dynamic and relevant principles, establishing a completely assessment indicator system of ecological vulnerability on typical wetland of Poyang Lake, these indicators should be divided into three kinds of sub-category: wetland ecological character, wetland overall function and wetland social environment, 19 indicators are included. By consulting expert advice, determining evaluation criteria, and identifying the target weight, we established weight vector; then dealing with indicators vaguely to identify grades subjection and construct matrix and establish a multi-level integrated fuzzy assessing model. Finally, assessed the ecological environment vulnerability of Poyang Lake typical wetland. The results indicated that typical wetland ecological environment vulnerability value is 0.768, being a light fragile state.