盐城海岸带植被覆盖度时空变化及其与土地利用变迁响应研究

Study on spatial and temporal vegetation coverage change of Yancheng coastal and response to its land-use dynamic change

以2001年、2009年TM遥感影像为基本数据源,在RS和GIS技术支持下,运用归一化植被指数(NDVI)和像元二分模型法获取植被覆盖度变化信息,采用人工目视解译和监督分类相结合提取土地利用信息,在分析了植被覆盖度和土地利用变化特征的基础上,将两者结合起来对其驱动力及其响应关系进行了分析。结果表明:近10年,盐城海岸带植被覆盖度整体有所提升,2001年研究区植被覆盖度呈现西南高东北低之势,中、高覆盖度占总面积的55.2%;2009年植被覆盖度相较2001年有明显变化,东北片区的植被覆盖度明显升高,西南部分地区有所下降。其中林地以中覆盖为主,占比30.72%,其他用地类型均以高植被覆盖度为主。分析发现,以湿地为主的土地利用变迁及人为干扰用地功能变化是其植被覆盖度变化的主要影响原因。

Based on TM remote sensing images of Yancheng coastal in 2001 and 2009, with technical support of RS and GIS, the model of dimidiate pixel based on normalized difference vegetation index（NDVI） was applied in extracting the Spatial and Temporal Vegetation Coverage Change of study area in recent 10 years, as while, the land use information was extracted by using artificial visual interpretation and supervised classification. In conjunction with the result of regional land cover and vegetation coverage change, the driving forces and response relationship between them were analyzed. The results show that： in recent 10 years, vegetation coverage of Yancheng coastal has been improved overall. In 2001, the vegetation coverage trend to be high in the southwest and low in the northeast, the area of edium and high coverage have accounted for 55.2%; In 2009, there are significant changes in vegetation cover compared to 2001, the vegetation coverage of the northeast area significantly increased, while the southwest part of the region declined. The forestland is covered by middle coverage, accounting for 30.72%, other land-use types are given priority to high vegetation coverage. The analysis found that the change of wetland dominated land use types and functions and human disturbance is the main influence of the vegetation coverage changes.