摘要
白城市位于北方农牧交错区,生态环境脆弱。为了解其土地生态安全状况,基于压力—状态—响应(pressure-stateresponse简称PSR)模型,共选取21个指标构建了土地生态安全评价指标体系,对2007—2012年白城市及其所辖5个县区土地生态安全变化情况进行评价分析。结果表明:(1)各县(市、区)土地生态压力—状态—响应情况不同,镇赉县、大安县及洮北区土地生态压力安全值较高,对安全综合值贡献率在38%以上;洮南市土地生态状态安全值较高,贡献率在36%以上;通榆县土地生态压力—状态—响应安全值分布比较均衡,贡献比为35∶34∶31。(2)2007—2012年,白城市土地生态安全综合值由0.712 2提高至0.780 4,土地生态环境有所改善,但土地安全等级仍处于敏感级,生态环境比较脆弱。(3)白城市土地生态安全状况的改善有赖于实施有效的人口政策,控制人口规模;引进人才,鼓励农民发展新型绿色农业,减轻土地污染压力;提高环境保护意识,加大环保投资力度,促进土地生态恢复。
Baicheng City is located in agro-pastoral zone in northern China.The ecological environment of this city is fragile.In order to understand the status of land ecological security in Baicheng City,we selected 21 indexes to construct the evaluating index system of land ecological security based on pressure-state-response model（PSR）,and to evaluate and analyze the changes of land ecological security in Baicheng City and 5counties（cities,districts）under its jurisdiction from 2007—2012.The results showed that：（1）statuses of land ecological pressure-state-response in different counties（cities,districts）were not same,the land ecological pressure values of Zhenlai County,Da′an County and Taobei District were higher,their contribution rates for comprehensive value were more than 38%;the land ecological state value of Taonan City was higher,and it′s contribution rate was more than 36%;the distribution of land ecological pressure-stateresponse value of Tongyu County was balanced,their contribution ratio was 35∶34∶31;（2）during the period from 2007 to 2012,the comprehensive value of land ecological security of Baicheng City increased from0.712 2to 0.780 4,and the land ecological environment had improved,but the land security level was still at the sensitive level,the ecological environment was fragile;（3）the improvement of land ecological security situation of Baicheng City depended on the implementation of effective population policy for controlling population scale,reducing the pollution pressure of land by introducing talent and encouraging farmers to develop new green agriculture,promoting ecological restoration of land by raising awareness and increasing investment in environmental protection.
出处
《水土保持研究》
CSCD
北大核心
2017年第2期259-266,共8页
Research of Soil and Water Conservation
基金
国家自然科学基金面上项目(51374208)
土壤与农业可持续发展国家重点实验室开放课题(Y412201432)
关键词
农牧交错区
土地生态
安全评价
PSR模型
白城市
agro-pastoral zone
land ecology
security evaluation
PSR model
Baicheng City
