基于植被指数的天津地区热环境危急状况分析  

Analysis of heat environmental critical situation based on vegetation index in Tianjin

作　　者：杜晋苗 杨艳丽[1] 申丽娜[1] 孙艳玲[1] 王中良[2] 

机构地区：[1]天津师范大学城市与环境科学学院,天津300387 [2]天津师范大学天津市水资源与水环境重点实验室,天津300387

出　　处：《天津师范大学学报（自然科学版）》2016年第3期33-37,共5页Journal of Tianjin Normal University：Natural Science Edition

基　　金：国家科技支撑计划项目课题资助项目(2012BAC07B02);教育部新世纪优秀人才支持计划资助项目(NCET-10-0954)

摘　　要：选取天津地区2009年和2013年Landsat遥感影像,反演地表温度和归一化植被指数,定量分析研究区地表温度和植被覆盖状况,并在此基础上计算、分类环境临界指数,以研究基于植被指数的热环境状况的时空分布特征.结果表明:地表温度与归一化植被指数NDVI整体分布趋势相反,从2009—2013年,地表温度显著上升,植被覆盖状况降低;研究区热环境危急区面积不断增加,中心城区热环境危急性处于紧急状态,近郊热环境危急状态变化明显;热环境危急区内,各危急状态类型的面积比例大小依次为紧急状态>严重状态>警戒状态.Land surface temperature and vegetation cover condition in Tianjin were quantitatively analyzed by inverting land surface temperature （LST） and normalized difference vegetation index （NDVI）, which were retrieved from Landsat remote sensing images at August 30, 2009 and August 25, 2013. Based on the above, the temporal and spatial distribution char-acteristics of heat environmental critical situation based on vegetation index was studied by computing and classifying environmen-tal criticality index （ECI）. The results indicate that the overall distribution of LST and NDVI show opposite trend, which mainly manifested in a significant increase of LST and decrease of vegetation cover condition from 2009 to 2013; the area of heat environmental critical region is increasing continuously, and the heat environmental criticality of central city is in the state of emergency while it is changing significantly in suburbs ; different levels of the heat environmental critical region could be arranged from the maximum to minimum area as emergency state, serious state and alert state.

关 键 词：植被指数 地表温度 环境临界指数 热环境危急状况 天津地区 

分 类 号：P463.3[天文地球—大气科学及气象学]