2002—2012年贵阳市土地生态安全评价

Evaluation of Land Ecological Safety in Guiyang During 2002—2012

为了给贵阳市的土地生态系统保护、土地资源的可持续利用和土地利用规划的制订提供参考,利用2002—2012年贵阳市相关年鉴数据,根据压力-状况-响应(PSR)概念模型构建贵阳市土地生态安全评价指标体系,采用熵权属性识别模型对其土地生态安全状况进行评价。结果表明:1)影响贵阳市土地生态安全的主要因素为单位耕地农药使用量、单位耕地化肥使用量、石漠化面积所占比重和土壤侵蚀模数,其权重分别为0.071、0.069、0.058、0.052。2)2002—2012年贵阳市土地生态安全的综合得分呈先降后升的变化趋势,2002—2009年的土地生态安全综合得分呈逐渐减小变化趋势,即由2002年的2.758下降到2009年的2.547;而2010—2012年的综合得分呈逐渐增大变化趋势,即由2010年的2.631增加到2012年的2.663。因此,贵阳市的土地生态安全状况不佳,但呈良好发展趋势。

The land ecological safety status of Guiyang during 2002-2012 was evaluated by the entropy attribute recognition model according to the index system of land ecological safety evaluation built by PSR conceptual model to provide a reference for protection of land ecological system,sustainable utilization of land resources and land utilization plan-making in Guiyang.The results showed that：1）the weight of pesticide application amount,chemical fertilizer application amount per unit area,proportion of stony desertification area and soil erosion modulus mainly affecting land ecological safety was 0.071, 0.069,0.058 and 0.052 respectively;2）The comprehensive score of land ecological safety presented a first declining and then rising trend.The comprehensive score of land ecological safety dropped 2.547 in 2009 from 2.758 in 2002 and increased 2.663 in 2012 from 2.631 in 2010.Therefore,the land ecological safety status of Guiyang was not good but showed a good development trend.