鄂尔多斯土地利用生态安全格局优化及方案评价

根据不同情景选择符合区域生态环境与社会经济特点的模型方法，已经成为区域土地利用生态安全格局构建的关键。本文以位于中国北方农牧交错带的鄂尔多斯市为研究区，基于自然地理数据、社会经济统计数据、土地利用/覆被数据，将最小累积阻力模型（MCR）引入土地利用生态安全格局的构建过程，并通过景观格局指数分析了基于MCR模型构建的安全格局与基于土地生态适宜性和多目标优化的安全格局的适用条件。结果显示：前者适宜于维持生态安全的情景，有利于降低土地系统中人类活动的生态风险；后者则适宜于维持生态适宜性的情景，有利于降低土地系统中自然因素的生态风险。研究结果对鄂尔多斯市土地资源的可持续利用具有重要的指导意义。

The Optimization of Ecological Security Pattern Based on Land Use and Assessment of Schemes in Ordos,Inner Mongolia,China

The construction of security-based land use pattern is the core of LUCC. How to select effective model and method suitable for the characteristics of regional socio-economic development under different sceneries proves to be a necessity for the land resources management as well as the ecological environment construction. This research seeks to develop a land use ecological security pattern for Ordos, which is a typical farming-pastoral zone with great vulnerability. Based on physical geographical information, socio-economic statistics and multi-year land use data, the Minimum Cumulative Resistance (MCR) model is employed to build the suitability map of curial land use forms with GIS technology. Then the application situation of the two methods, i.e. MCR model and multi-objective programming model based on land ecological suitability are analyzed through landscape indices. And it shows that MCR applies in the situation of maintaining ecological security, beneficial to the abatement of man-made ecological risk; while the latter suits to keep ecological suitability, for the reduction of natural risks. This research extends the application of MCR model and is significant for regional sustainable land use.