洞庭湖流域生态安全状态变化及其驱动力分析  

Eco-security in Dongting Lake watershed: Its changes and relevant driving forces

作　　者：刘明[1] 刘淳[1] 王克林[1] 

机构地区：[1]中国科学院亚热带农业生态研究所

出　　处：《生态学杂志》2007年第8期1271-1276,共6页Chinese Journal of Ecology

基　　金：中国科学院知识创新工程重要方向资助项目(KZGX2-SW-415)

摘　　要：通过构建由状态子系统、压力子系统和响应子系统组成的洞庭湖流域生态安全评价系统,重点研究了该流域的生态安全变化趋势,并采用因子分析方法探究其驱动力。结果表明,1949年以来,流域生态安全变化表现出如下特征:系统状态指数明显下降,波动性和阶段性显著;系统压力指数1990年后呈下降趋势;系统响应指数一直呈增长趋势;生态安全度自1990年以来开始稳步上升。因子分析表明,流域生态风险是自然和人为因素叠加的结果,农民人均收入增加、农业人口占总人口比例减少、单位面积土地产值和单位土地面积生态建设投入增加,是促进流域生态安全度提高的决定性因素。同时,本文提出了提高流域生态安全度的相关对策。By using the eco-security assessment system consisted of state subsystem, pressure subsystem and response subsystem, the changes of the eco-security in Dongting Lake watershed were studied, and their driving forces were analyzed with factor-analysls method. The results showed that since 1949, the eco-state index fell markedly and fluctuated periodically, and after 1990, the eco-pressure index had a declining trend, while eco-response index ascended all along. Since 1990, the eco-security index increased gradually. The ecological risk in Dongting Lake watershed was resulted from the additive effect of natural factors and anthropogenic activities, while the increase of farmers＇ yearly average income, unit area land output value and unit area land ecology construction investment and the decrease of the proportion of agricultural population were the determinant factors in improving the eco-security of the watershed. In view of these, some countermeasures were put forward to enhance the eco-security of this watershed.

关 键 词：生态安全 变化 驱动力 洞庭湖流域 

分 类 号：X171[环境科学与工程—环境科学]