Land use transition is an important factor affecting ecological environment change.High-resolution land use data is selected from 2001,2011 and 2021 in Changchun.Firstly,land use transfer matrix and dynamic attitude of land use are used to analyze temporal and spatial changes of land use pattern.Based on ecological environment quality index and ecological contribution rate index,the response of ecological environment to land use transformation in Changchun is explored.The results show that:① Cultivated land and construction land are the core land use types required for the development of Changchun from 2001 to 2021.The cultivated land area increases first and then decreases,accounting for more than 75%of the total area,and the construction land area continues to grow.The grassland,water area and unused land area showed a decreasing trend to different degrees.The forest land maintained its ecological stability and changed little.The conversion among land types was most obvious in cultivated land and grassland.② In the past 20 years,the range of low-quality areas in central urban areas has gradually expanded,while that in sub-central urban areas has slightly decreased.From 2011 to 2021,the decline rate of ecological environment quality in Changchun slowed down compared with that in 2001 to 2011.The area of ecological environment improvement increased,but the overall ecological environment quality changed little.③ From 2001 to 2021,part of grassland in Changchun was deserted and water area was destroyed,resulting in severe ecological problems.Although the implementation of national ecological policies such as returning farmland to forest or grassland has improved the quality of urban ecological environment,the deterioration trend is still higher than the improvement trend.The research results can provide scientific basis for the optimization of land spatial pattern and the improvement of ecological environment in Changchun.

土地利用格局的变化对生态系统环境的影响重大,它是区域间人地关系的桥梁之一.利用沈阳市2000,2010,2020年3期高分辨率的土地利用数据,基于沈阳市的城市定位,依据土地利用转移矩阵、动态度探析区域化的土地格局及转型,应用区域生态环境质量指数和土地利用转型生态贡献率评估生态效应.结果表明:①20年间,耕地是区域重点发展地类,面积始终占70％以上,建设用地扩展持续缓慢,水域面积稳中有升,耕地与草地之间的地类转换明显,二者面积略有下降,未利用土地与林地面积变化不大,维持自身生态平稳.②20年间,生态环境质量指数动态变化,呈"先升后降"趋势.③部分区域草地垦荒、 建设用地规模广,生态问题严峻,在政府退耕还林、 退耕还草等一系列政策的实施下,生态环境有所改善,但恶化趋势仍略高于改善趋势.探索沈阳市生态约束下的土地空间规划是很有必要的,研究结果可为沈阳市土地的空间格局优化、生态环境改善提供一定的科学依据.