基于PSR模型的江苏海岸带生态系统健康时空变化研究

以江苏省海岸带为例,基于PSR模型构建江苏省海岸带生态系统健康评价指标体系,采用熵权法和层次分析法结合确定指标权重,依据构建的评价模型对近19年间的生态系统健康状况进行评价与分析.结果表明:研究区各县市生态系统健康综合指数在3~6之间,处于一般等级的区域占总面积的54%~66%,处于较差等级的区域占34%~45%,空间分布上表现为研究区中部生态系统健康状况较好,而南北两侧相对较差;研究区生态系统一直处于一般健康水平,但从健康指数构成来看,研究区压力、状态、响应因子值在研究期间都有不同程度的下降,生态健康指数在2002年以后略表现出下降趋势,应引起足够的重视.

Spatiotemporal variations of ecosystem health of the coastal zone in Jiangsu Province based on the PSR model

Coastal zone is the transitional area between marine ecosystem and terrestrial ecosystem, its ecosystem health is closely related to human activities. This paper took the coastal zone of Jiangsu Province as an example to assess the spatiotemporal variations of ecosystem health from 1995 to 2013. A multi-indices evaluation system was constructed to investigate ecosystem health based on the PSR conceptual model, and the index weight was determined with AHP and Entropy weighting method. Results showed that the ecosystem health indices of all sub-regions ranged from 3 to 6. The area with normal status accounted for 54% to 66% of the whole region, and the area in worse condition were 34 to 45%. Spatial pattern suggested that the middle part of the study area lied in better condition than those of southern and northern area. The values of pressure、state、response factors showed gentle decline of ecosystem health condition, particularly after 2002, which may need more attention for protection by the local government.