南疆生态脆弱区土地利用变化及其生态影响评价--以新疆阿克苏市为例

在城市化速度加快的背景下,研究LUCC对生态脆弱区的生态环境影响过程,对了解区域生态环境变化具有重要意义。利用南疆生态脆弱区———阿克苏市1995、2000和2003年的TM遥感影像,采用景观生态学的空间格局指数对城乡土地利用动态变化特征进行了研究,参照Costanza等对全球不同生态系统类型服务功能价值测算结果的比例关系,分析了阿克苏市城乡土地利用类型的生态价值,定量综合评价了阿克苏市城乡区域LUCC的生态影响。结果表明,阿克苏市域景观总体构成表现为景观破碎度较高,斑块数目较多;农业用地中有近半数不稳定,水土条件差致使农用地和未利用地相互转换。研究时段内市域土地利用变化带来了较好的生态影响,土地利用生态效益持续提高,并表现出了较大空间差异。

Land use change and its ecological effects in the ecotone of Southern Xinjiang Uyghur Autonomous Region: A case study of Akesu City area

Land use change and its ecological effects is a hotspot in the study of land use/land cover change(LUCC).Based on the TM images in 1995,2000 and 2003,and according to the parameter proportion provided by Costanza in the evaluation of global ecosystem service value,this paper analyzed the ecological values of different land use types in the Akesu City of Xinjiang Autonomous Uyghur Region,and quantitatively assessed the ecological effects of LUCC in the rural and urban areas of the City.The results showed that the landscape fragmentation index in Akesu City was high,and near half of its cropland was instable because of water stress.During the study period,land use change improved the ecological benefits of land use,and presented a significant spatial diversity.