%0 Journal Article
%T Regional ecological risk assessment of in the Liaohe River Delta wetlands<br>辽河三角洲湿地区域生态风险评价
%A FU Zaiyi
%A XU Xuegong
%A LIN Huiping
%A WANG Xianli
%A <br>付在毅
%A 许学工
%A 林辉平
%A 王宪礼
%J 生态学报
%D 2001
%I 
%X Ecological risk assessment is a new study field. Its objective is to estimate the possibility and magnitude in which some undesired ecological events will occur by using mathematics, probability and other risk analysis techniques. Regional ecological risk assessment is one branch of ecological risk assessment,for which both the receptors and sources of risk must be in regional scale, and the exposure and effects assessment must account their uncertainty and spatial heterogeneity. In the case study of the Liaohe River Delta wetlands.this article inguires into the theory and method of regional ecological risk assessment. First, we select birds and their habitats as risk receptors after analyzed the landscape framework and ecological function of the wetlands. Second, we define the mainly risk sources in this region including flood, drought, storm tide and oil pollution events. According to the statistic of the region, the probability and distributing of each kind of risk sources are gained. Third, the habitat receptor is exposed under risk sources and contacts with bird receptor. Risk sources will affect the habitat elements and the birds will be harmed. In the exposure and hazard analysis, we use ecological index to denote the important degree of each habitat, use fragile index to show their features of anti risk. Hazard consequences are analyzed, which formed by different risk sources. In order to compare the risk brought by different risk source, we use AHP method to get the weigh of each kind of risk sources. Finally, risk assessment is the integrated phase of the research. Because of the spatial heterogeneity of risk sources, all risk sources are overlaid in the region, which divides the region into 122 risk areas. Within each risk area there is homogeneous for risk sources but heterogeneous for habitats. So we can get the ecological index and fragile index of each risk area according to the types of habitats in it, then combine probability and weigh of risk sources to calculate risk value of each risk area. According to the risk value of each risk area, the wetland region in Liaohe River Delta is divided into five levels of risk zones. The result of assessment provides scientific basis for environmental risk management of the Liaohe River Delta.
%K regional ecological risk assessment
%K Liaohe River Delta
%K wetlands<br>区域生态风险评价
%K 辽河三角洲
%K 湿地
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=4AA13ED2E0444F82&yid=14E7EF987E4155E6&vid=659D3B06EBF534A7&iid=38B194292C032A66&sid=683005D16807E4FE&eid=F4BDB5452F9F5642&journal_id=1000-0933&journal_name=生态学报&referenced_num=75&reference_num=10