基于水土流失的赣州市生态安全评价

为定量评价赣州地区30 a来水土流失治理对生态环境变化的影响,基于水土流失状况构建了赣州市生态安全评价指标体系。利用"压力—状态—响应"模型,从水土流失角度,采用频度统计法和专家咨询法,构建了17个评价指标,首次对赣州地区生态安全状况进行了评价。结果表明:(1)经过30 a的水土流失治理,赣州地区生态安全水平得到明显提高,但局部地区出现了不同程度降低,整体生态安全等级处于Ⅲ级水平,生态环境有待进一步的改善;(2)赣州地区水土流失与生态安全呈现明显的负相关性,经过30 a的水土流失治理,赣州市水土流失与生态安全的负相关性逐渐减弱,水土流失对该地区的生态安全影响逐步降低,因此,水土保持是改善该地区生态环境的重要途径之一。

Ecological Security Assessment Based on Soil and Water Loss in Ganzhou City

To quantify the effects of 30 years soil and water conservation on the regional ecological security in Ganzhou City,the 17 indices of ecological security assessment were constructed using frequency statistics and expert consultation method based on soil erosion status of study area.The ecological security of Ganzhou City was evaluated by the pressure state response model.The results showed that:(1)The ecological security of Ganzhou City obviously improved in the past 30 years.However,the level of ecological security declined in some area.The integrated level of ecological security was only grade in Ganzhou City and needed further improvement.(2)Negative correlation between ecological security and soil and water losses was found in Ganzhou City.With 30 years comprehensive conservation of soil and water,the correlation was weakening,and the influences of soil erosion and water losson the ecological security were decreased.Therefore,soil and water conservation become one of the most important methods to improve ecological environment in Ganzhou City.