摘要
快速城市化进程使得地表覆被发生显著变化,极大地改变了原始植被生长环境。文章采用MODIS(Moderate Resolution Imaging Spectroradiometer)植被指数产品、MDSP-OLS(Defense Meteorological Satellite Program-Operational Linescan System)城市夜间灯光时间序列等数据,利用趋势分析等方法,分析了长株潭城市群植被生长时空动态变化特征、城市群扩张对植被动态变化的影响。研究结果表明:2001—2017年,研究区植被覆盖情况良好,NDVI(Normalized Difference Vegetation Index)多年平均值在0.4~0.6之间,整体上植被生长向良好态势发展;研究区NDVI呈缓慢上升趋势,并具有两个明显阶段:2001—2009年呈波动上升趋势,2010—2017年呈显著线性上升趋势;受城市群扩张影响,长沙、株洲、湘潭3个城市周边区域NDVI变化呈显著下降趋势,但下降速率较为缓慢;MDSPOLS城市夜间灯光序列数据变化趋势可有效指示长株潭城市群城市扩张过程;长株潭城市群在城市扩张过程中城市绿化、生态环境得到较好的保护和发展,87.46%城市扩张区域NDVI保持较低水平的显著性上升趋势,仅有7.13%城市扩张区域NDVI呈显著性下降趋势。
Rapid urbanization process has changed the land cover significantly,and it also altered the vegetation original growth environment.In this study,the Moderate Resolution Imaging Spectroradiometer(MODIS)vegetation products,the Defense Meteorological Satellite Program-Operational Linescan System(MDSP-OLS)urban night light time series data and some other datasets were utilized to analyze the spatiotemporal characteristics of vegetation growth dynamics,the impact of urban expansion process on vegetation dynamic changes in Changsha-Zhuzhou-Xiangtang(CZT)urban agglomeration.The results show that the vegetation coverage in the study area is good between 2001 and 2017,with the multi annual average Normalized Difference Vegetation Index(NDVI)between 0.4 and 0.6,and in general,the vegetation growth is tending well situation;the NDVI changes in the study area showed a very slowly upward trend with two distinct stages:fluctuating upward trend in 2001-2009 and significant linear upward trend in 2010-2017;due to the urban expansion,the NDVI changes,on the surrounding areas of Changsha,Zhuzhou and Xiangtang cities,showed a significant downward trend,but with a very slowly speed;the trend of MDSP-OLS series data can effectively indicate the urban expansion process of CZT urban agglomeration;during the expansion process of CZT urban agglomeration,the urban greening and ecological environment have been protected and developed carefully and well,with vegetation in 87.46%of urban expansion area maintained a significant upward trend at a very low level and only 7.13%of urban expansion area showed a significant downward trend.
作者
胡顺石
彭雨龙
秦建新
谭子芳
HU Shunshi;PENG Yulong;QIN Jianxin;TANG Zifang(College of Resources and Environmental Sciences,Hunan Normal University,Changsha 410081,Hunan,China;Key Laboratory of Geospatial Big Data Mining and Application,Hunan Province,Hunan Normal University,Changsha 410081,Hunan,China)
出处
《经济地理》
CSSCI
CSCD
北大核心
2019年第12期178-186,共9页
Economic Geography
基金
湖南省自然科学基金项目(2018JJ3348)
湖南省教育厅科学研究项目(17C0952)
中国国家留学基金项目(201806725009)
湖南省地理学一流学科建设项目
关键词
植被指数
长株潭城市群
城市扩张
夜间灯光数据
绿地系统
vegetation index
CZT urban agglomeration
urban expansion
night light data
green space system
