在对延安市土地生态环境问题进行调查研究的基础上,采用基于ArcGIS区统计方法进行土地生态敏感性评价,并首次采用了客观确权法——变异系数法确定评价因子权重,与以往叠加评价方法相比,在评价思路、确权方法、评价单元和叠加方法上都有不同程度改进,评价结果更加准确、客观、实用。土地生态敏感性评价结果显示,极敏感和高敏感区占到了全市总面积的40.11%,不敏感和低敏感区占全市总面积的52.06%,地域分异规律上,敏感性程度由北向南逐渐递减,并进行了土地利用生态敏感性评价。最后,针对不同土地生态敏感性分区因地制宜提出用地策略,为本轮土地利用总体规划修编和指导今后土地科学利用服务。

"Outline of National Land Use Planning (2006-2020)" indicates that in the new round of land use planning we should not only adhere to the guiding principles including strict protection of arable land, using land economically and intensively, and coordinating all types of lands, but also make overall arrangements of life, ecology and production land and strengthen ecological construction of land with the requirements of construction of environment-friendly society. Land ecological sensitivity evaluation has significance for identification of land ecological problems, guidance of land use zoning control, coordination of land use and construction of ecological environment. Based on the investigation of land ecological problems of Yan’an, we use the zonal statistics method of ArcGIS to evaluate land ecological sensitivity. The variation coefficient method which is objective is used to determine the weights of evaluation factors in similar studies for the first time. Compared with the previous evaluation methods, the method of this paper is improved in the evaluation idea, the weight determining method,the evaluation unit and the overlay method, which makes the evaluation result more accurate, objective and practical. The land ecological sensitivity evaluation result shows that extremely and highly sensitive area of the city accounts for 40.11% of total area and insensitivity and low sensitivity area accounts for 52.06%; the sensitivity gradually decreases from north to south in regional differentiation law; the result of ecological sensitivity evaluation of land use shows that high-intensity land use activities like farming, livestock, urban and rural construction and infrastructure construction cause land ecological problems. Lastly, land use policies for the current round of land use planning revision and future scientific use of land are proposed according to the land ecological sensitivity.