近17年鄱阳湖区生态系统健康时空变化研究

Study on the temporal and spatial variations of ecosystem health in Poyang Lake region over the recent 17 years

以遥感影像和社会统计数据为基础,构建基于压力-状态-响应(P-S-R)概念模型的鄱阳湖区生态系统健康评价指标体系,并建立湖区生态系统健康评价模型,通过对生态系统健康指数的计算与分析,揭示鄱阳湖区生态系统健康的时空变化特征.研究结果表明,在人类生产活动的影响下,近17年鄱阳湖区生态系统结构渐趋不合理,生态系统功能有所减弱,虽然湖区生态系统健康总体处于一般水平,但人类活动干扰的不断加强,导致湖区生态系统健康正逐步向着恶化方向发展.湖区生态系统健康在空间分布上呈现出南北分异的特点,南部工业化、城镇化水平较高的地区生态系统健康状况较差,经济发展水平较低的北部地区,生态系统健康状况则相对较好.

Considering the characteristics of ecosystem and human activity in Poyang Lake region, an indices framework for ecosystem health was constructed based on the P-S-R conceptual model, and the evaluation indices were obtained from the remote sensing images and social statistic data. The evaluation model was estabhshed to investigate the temporal and spatial variations of ecosystem health in the Poyang Lake region. The results indicated that the ecosystem structure was becoming unstable, and its ecological function was degrading from 1989 to 2006. Although the level of ecosystem health was in a general class according to the Classification of ecosystem health levels, the index of ecosystem health decreased gradually during the 17 years owning to the long-term intervention of intensive human activities. Furthermore, the level of ecosystem health showed spatial differences with relative worse condition in the south part, due much to more significant industrialization and urbanization.