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将浙江省苕溪流域生态系统细分为社会经济、生态环境和环保支持三个子系统并分别建立指标体系,采用权重经熵值修正的物元模型对1998年、2003年和2008年的指标值进行分析和评价。结果表明:社会经济子系统状态从较合理转变为不利于生态环境健康发展;生态环境状态隶属于亚健康等级,综合关联度从1998年的-0.235 0增大到2008年的-0.083 3,呈现出逐步远离健康状态的趋势;污染控制、环保投入和环境管理等措施的力度从1998年的不足逐步得到改善。采用分形理论评价整个苕溪流域生态系统的综合状态,三年的分维度依次为0.619 4、0.674 9、0.680 6,说明苕溪流域在城市化作用下正面临不断增大的压力和胁迫,朝着逆向、不健康的方向发展。综合分析表明,苕溪流域城市化发展已对整个生态系统造成诸多不利影响,因此未来城市发展与土地利用中应更加重视生态环境保护,以实现流域生态系统稳定、健康、有序发展。
The ecological system of Tiesi River Basin in Zhejiang Province was subdivided into three subsystems of social economy, ecological environment and environmental protection, and the index system was established respectively. The index values were revised by the matter-element model with weights modified by entropy values for 1998, 2003 and 2008 Analysis and evaluation. The results showed that: the state of socioeconomic subsystem changed from more reasonable to unfavorable to the healthy development of ecological environment; the state of ecological environment belonged to sub-health level, the comprehensive relation increased from -0.235 0 in 1998 to -0.083 in 2008, Out of the trend of gradually getting away from the state of health; the efforts of such measures as pollution control, environmental protection input and environmental management have been gradually improved from the deficiencies in 1998. The fractal theory was used to evaluate the comprehensive status of the ecosystem in Zhe River Basin. The fractal dimensions of the three years were 0.619 4,0.674 9,0.680 6, indicating that under the urbanization, the Tiexi Basin is facing increasing pressure and stress, , Unhealthy direction. Comprehensive analysis shows that the urbanization of Tiesi River Basin has caused a lot of adverse impacts on the entire ecosystem. Therefore, in the future urban development and land use should pay more attention to ecological and environmental protection in order to achieve a stable, healthy and orderly development of the basin ecosystem.