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《Resources and Environment in the Yangtze Basin》 2011-04
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WANG Wei1,2,SHEN Shuang-he1,ZHAO Xiao-yan1,YANG Shen-bin1(1.College of Applied Meteorology,Nanjing University of Information Science & Technology,Nanjing 210044,China; 2.Chinese Academy of Meteorological Sciences,Beijing 100081,China)  
It seems that afforestation is the most widely applied measure on mitigating UHI.However,the cooling down law of vegetations is indistinct as well as how to plant scientifically.Based on an ETM+ image,LST,RSR and NDVI of Nanjing were retrieved after effective atmospheric correction by ATCOR2 module.In comparison of ETM+ LST with ASTER LST and measured values,they agreed well with each other.Regression and contrastive analysis were conducted for explaining relationships between LST and the two vegetation indexes.Results showed that UHI effect was extremely obvious in summer,and there were also many cold spots in urban water bodies and greenbelts in Nanjing.The LST associating with thick vegetation was much smaller than that with sparse vegetation or bare lands,excluding water bodies.Fitting models proved a significant negative linear correlation between LST and NDVI,while LST and RSR were more closely correlated.When RSR was less than 3.2,LST decreased rapidly with the vegetation coverage increasing.However,it tended to be unchangeable when RSR exceeded 3.2.Cooling effect of vegetation was at "saturation",and only RSR could reveal the interesting phenomenon.Obviously,cooling effect of vegetation was limited by underlying surface patterns.With regard to NDVI,RSR was not only better for indicating the relationship between LST and vegetation coverage,but more effective for reflecting heat environment of the city.We hope this paper is helpful for urban forestation and ecological construction.
【Fund】: 江苏省自然科学基金资助项目(BK2006227);; 北京城市气象科学研究基金项目(UMRF200703)
【CateGory Index】: TP751
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Chinese Journal Full-text Database 10 Hits
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