基于LUCC的生态型城市土地生态敏感性评价

土地生态敏感性评价是分析区域生态安全的重要方法之一,基于Landsat影像解译结果,应用土地利用与覆被变化相关研究方法,对商洛市土地利用程度进行分析,通过水土保持、灾害防治、生境保护3大指标对研究区土地生态敏感性进行分级,并通过灰色模型和变异系数改进分级模式,对比各敏感性等级中土地利用程度变化,分析研究区生态恢复模式。结果表明:1990—2009年商洛市土地利用程度呈衰退趋势,退耕还林面积较大,生态环境逐渐改善;基于指标等级进行敏感性分区,中敏感区面积较大;基于不确定性根据变异系数分区,分区比例较为合理;由于高敏感区土地利用退化量最少,研究区生态建设布局模式仍值得讨论。

Land Eco-sensitivity Assessment Based on LUCC in Ecological City

Land eco-sensitivity assessment is an important method in analyzing regional Eco-environmental safety.This article is based on the studies of land use and coverage change with the interpretation result from Landsat images.It analyzes the land use degree of Shangluo City and gave the land eco-sensitivity classification,which included soil and water conservation,disaster prevention and ecological protection.Then an improved classification model was taken through the gray model and the variation coefficient.By contrasting sensitivity in each level of land use degree change,the ecological recovery mode in study area was analyzed.The results showed: the land use degree in Shangluo City has been declined from 1990 to 2009,large area converted form cropland to forest which gave a better environment;the sensitivities of partition based on the index level showed the middle sensitive area was the largest.According to the variation coefficient gave the more reasonable proportion,the partition was improved based on uncertainties.Because of the least amount of land use degradation area was taken in high sensitive region,it was considered that the ecological construction model in study area was still worth discussing.