中文摘要：

吉林省西部是吉林省耕地主要集中区和商品粮主产区之一,而该区长时序、高强度的土地开发引起了农业生态安全水平的大幅下降.研究该区土地利用变化及其农业生态安全响应具有现实意义.以吉林省西部1930年～2000年的土地利用数据为基础,以ARCGIS为数据集成分析平台,采用景观生态学方法对该区域进行LUCC及农业生态安全研究,探讨该区的LUCC及农业生态安全的作用机制和响应方式。结果表明：草地和湿地的面积迅速减少，区域景观不断破碎化,景观异质性显著变化.LUCC的驱动力主要是政策鼓励和人口的迅速增长。农业安全响应主要表现为以下几个方面：农业生态环境恶化,农业环境安全程度降低；土地资源特别是耕地资源安全受到威胁；农业生物资源安全受到极大威胁；农业水资源匮乏，水质恶化，环境污染加剧；粮食等农牧业产品安全形势严峻。为各级政府部门的农业管理与决策提供参考。

英文摘要：

West Jilin province is an important base for merchandised grain production. While long-term and intensive agricultural activities resulted in decline of agricultural eco-security level. It is of great significance to study the regional land use and land cover change （LUCC） and the responses of agricultural eco-security to the LUCC. By the use of the technologies of ARCGIS and remote sensing, the regional LUCC and the responses of agricultural eco-security were studied with the tool of landscape ecology after the collection of the land use data from 1930 ～ 2000 including the Landsat/TM data in 2000, 1996 and 1986, and the topographic data in 1954 and 1930, which was done according to the aerial photograph interpretation in the study area. The results are as follows： the land use pattern were transformed with grassland, wetland and woodland shrinking dramatically （41.51→10.91% and 26.37 %→5.02% within 70 years from 1930 to 2000 respectively） while arable land, sandy land, saline-alkaline land and inhabited area expanding rapidly （14.44%→52.75%, 0.4%→4.83%, 0.3%→14.73% and 0.64%→5.42% within 70 years from 1930 to 2000 respectively）; Fragmentation of landscape was increasing and spatial heterogeneity changed dramatically; There were two reasons for the regional LUCC in the study area： One is the guidance of Agricultural policy and encouragement from government during the past decades; the other is the rapid expansion of population. The population had increased with an increment of 10 times as much as that in 1932. Besides, the natural factors also partly contributed to the LUCC due to the fragility of the environment. As a result, the agricultural environment deteriorated with the temperature increment, reduction of annual precipitation and more extreme whether. Land resources, especially arable land, were in a non-security state, which were threatened by the process of salinization, alkalinization, sandy desertification and grassland degradation. Biodiversity were threatened or endanger