长三角地区植被退化的空间格局及影响因素分析  

DIMINISHED VEGETATION GREENNESS IN YANGTZE RIVER DELTA DUE TO RAPID UNPLANNED URBANIZATION

作　　者：李广宇[1,2] 陈爽[1] 余成[1,2] 王肖惠[1,2] 

机构地区：[1]中国科学院南京地理与湖泊研究所,江苏南京210008 [2]中国科学院大学,北京100049

出　　处：《长江流域资源与环境》2015年第4期572-577,共6页Resources and Environment in the Yangtze Basin

基　　金：国家自然科学基金面上项目(41371179);中国科学院知识创新重要方向项目(KZCX2-EW-315)

摘　　要：植被退化是陆地生态系统功能下降的重要表征。利用2000-2010年SPOT-VEGETATION NDVI遥感数据、土地利用数据,采用趋势分析、叠加分析和格网计算方法,对长三角植被退化的空间格局及其影响因素进行分析。结果表明：10a间长三角地区最大化NDVI均值空间分布南北高、中间低,区域14%的植被覆盖面积显著退化。植被退化呈现一定的空间分异,而人类活动是导致植被退化的主要原因。在长江以南、太湖的北部与东部,环杭州湾地区及南京、南通和台州等城市快速无序的城镇化,造成了建设用地面积增加和耕地的破碎化,使植被退化区域集中连片分布。经济利益驱动农民将水田转化为向水产养殖,引起植被退化。部分区域植被面积未减少而呈退化态势的原因有待研究。Urbanization and land use change are two processes with far-reaching consequences at both global and local scale.Vegetation is an important characterization of terrestrial ecosystem function.Analysis of spatialtemporal change of vegetation greenness is an effective way to reveal the degree of vegetation degradation.Urbanization reduces the amount of vegetation by clearing natural and semi-natural vegetation for construction over large tracts of land.To study the impacts of land use on vegetation coverage is of significance to direct regional urban planning and land use planning.The Normalized Difference Vegetation Index（NDVI）can be used as a proxy for vegetation productivity and vegetation greenness.The Yangtze River Delta（YRD）is one of the most developed regions with highest urbanization speed in China.Rapid urbanization has occupied a large area of arable land and forest in this area,with a significant decrease in greenness and in vegetation productivity.Based on SPOT NDVI data from 2000 to 2010,land use data in 2000 and 2010,taking YRD as a study case,this paper studied the distribution of decrease in NDVI,and the relationships between land use change and vegetation degradation.Ordinary Least Squares was applied to analyze the negative trend of NDVI in 11 years.We analyzed the effect of land use change and construction land growth on NDVI by using 1-km area grid data.In 2000-2010,the highvalue region of NDVI was concentrated in mountain area of Southeast and West Zhejiang and the northern plain of Jiangsu.The low value area was mainly in and around big cities such as Shanghai,Hangzhou,Nanjing,Suzhou,Wuxi,Changzhou,Ningbo and so on.Spatial Differentiation of NDVI reflected the diversity of landscape.The vegetation cover in 14%of the study area decreased significantly.Vegetation degradation was mainly distributed in the south of the Yangtze River and in the north and east of Taihu Lake,around Hangzhou Gulf,or around big cities,such as Nanjing,Nantong,Taizhou（Zhejiang Province）and so on.Land use chang

关 键 词：长三角 植被退化 空间格局 NDVI 影响因素 

分 类 号：K901[历史地理—人文地理学]