基于神经元网络模型的崇明东滩湿地生态系统健康评估

ASSESSMENT OF WETLAND ECOSYSTEM HEALTH IN DONGTAN,CHONGMING ISLAND BASED ON NEURAL NETWORK

崇明东滩湿地位于崇明岛的东端,是全球重要的生态敏感区域,由于受到人类活动的干扰,生态系统健康遭受威胁,因此有必要对其健康进行定量的评价研究。以崇明东滩湿地为研究区域,以生态系统健康理论为基础,选取地形地貌、环境、生物、人类干扰等指标,并将研究区的健康分为五级,建立东滩湿地健康评价指标体系。结合GIS的技术,以网格为评价单元,并在神经元网络模型理论和技术的支持下,提出了一个分布式神经网络湿地生态系统健康评价模型,定量的分析崇明东滩湿地的健康状况,为湿地的合理利用与保护提供决策支持和科学依据。研究结果从空间上显示了崇明东滩湿地不同区域的健康状况,总体来说处于一个比较健康的状态,但健康状态较好的区域面积只占30%,相对一般区占70%,且生态系统健康将呈下降趋势。因此,需要对湿地加强管理,使湿地生态系统可持续发展。

Located at the east of Chongming Island,Dongtan wetland is an ecological sensitive region of global importance.Interfered with human activities,its ecosystem health is faced with threat.Thus,it is necessary to make quantitative research on its health assessment.This study took Dongtan wetland of Chongming Island as a research area,selected indicators like topography and geomorphology,environment,biology and human interference.Based on theory of ecosystem health,this study divided the health condition of research area into five levels and built an index system of wetland health assessment in Dongtan,Chongming Island.Combined with GIS and neural network model technologies,the study took grid as evaluation unit,and then established a neural network model of wetland ecosystem health assessment to quantitatively analyze the health conditions of Dongtan wetland.This model could provide decision-making support and scientific basis for rational utilization and protection of wetland sources.The result displayed the health conditions of Dongtan wetland in different areas from space.Generally,Dongtan wetland is comparatively healthy,but areas with healthier condition occupied only 30% and others are in a general condition.Furthermore,the wetland ecosystem health has a descending trend.Therefore,it is necessary to strengthen management of wetland and make a sustainable development of wetland ecosystem.