基于PSR模型和投影寻踪法的荆州市景观生态风险评价

Landscape Ecological Risk Analysis for Jingzhou City Based on PSR Model and Projection Pursuit Method

在PSR(pressure-state-response)模型的基础上,结合投影寻踪法,建立荆州市景观生态风险评价模型,分析荆州市景观生态风险变化。结果表明:1995—2013年间研究区景观生态风险等级由1995年的"低"增大至2013年的"较高";压力指数随着社会经济发展有所增加,状态指数持续减小,响应指数随着经济和政策的影响逐渐增大。景观生态风险评价结果也表明,随着社会经济压力不断增大,景观生态系统质量日益下降,但生态环境保护措施的加强能够显著缓解风险增大的趋势。

Based on pressure-state-response(PSR)model which was used to assess the landscape ecological risk and projection pursuit method,a landscape ecological risk assessment model was established for Jingzhou City,Hubei Province.The results showed that,Jingzhou City suffered increasing risk from1995to2013with landscape ecological risk index(LERI)from level I to level IV.Pressure index(PI)increased continuously,state index(SI)decreased,while response index(RI)increased gradually with the influence of economy and policy.The assessment results also showed that with the increasing pressure of society,the quality of landscape ecosystem decreased increasingly,but strengthening environmental protection measures could relieve the risk obviously,and made the risk to increase slowly.