摘要
综合运用遥感与GIS技术,基于2000、2007和2013年的DMSP/OLS夜间灯光数据和MODIS NDVI数据,利用灯光阈值提取法、植被指数分析等方法,研究环杭州湾地区城市扩张和建成区植被变化特征.结果表明:采用最佳阈值方法,能够实现对城市地区用地信息的有效提取;环杭州湾地区城市用地整体围绕杭州湾呈"V"型模式扩展,并表现出面状、线状和点状3种扩张模式;从城市扩张速度、动态度和形态紧凑度来看,各地级市表现出较大的时空差异,但整个研究区的城市扩张速度和动态度普遍呈现降低趋势,平均城市形态紧凑度则经历了先下降后上升的过程.各城市建成区的植被状况也存在显著差异,2000—2007年,除嘉兴市建成区植被状况变差外,其余各地级市建成区植被状况均变好;2007—2013年,所有城市建成区植被状况变差;2000—2013年,城市扩张对建成区植被均产生了不利影响.
Based on DMSP/OLS night-light data and MODIS NDVI data for 2000, 2007 and 2013, this paper studied on characteristics of urban expansion and vegetation changes in built-up areas with nighttime light threshold extraction and vegetation index analysis using remote sensing and GIS. Results showed that the threshold method could realize the effective extraction of urban land infor- mation. In general, the urban built-up area expanded along with Hangzhou Bay in V model, and there were three expansion patterns： polygon pattern, linear pattern and point pattern. Obvious spa- tio-temporal variations in different cities were found in the rate and the dynamic degree of urban ex- pansion and the compactness of urban morphology. The whole study area showed a decreasing trend in the rate and the dynamic degree of urban expansion, while the average compactness of urban morphology declined after the rise. Vegetation conditions became better in built-up areas except Jiaxing in 2000-2007, but it became worse in all cities in 2007-2013. Urban expansion had a negative effect on the vegetation change in built-up areas in 2000-2013.
出处
《应用生态学报》
CAS
CSCD
北大核心
2017年第1期231-238,共8页
Chinese Journal of Applied Ecology
基金
中央高校基本科研业务费专项
浙江省"钱江人才计划"C类项目(QJC1302005)
教育部留学回国人员科研启动基金项目
杭州市软科学研究项目(20140834M46)资助~~
