关键词: 变权模型,  , 生态安全,  , 预警,  , 舟山群岛

Abstract: We quantified the land surface thermal environment during urbanization of the main urban area of Fuzhou by extracting the land use/land cover (LULC) based on Landsat series remote sensing data and retrieving the land surface temperature (LST). The results showed that there were dramatic changes in LULC of Fuzhou from 1993 to 2013, with the reduction of urban green space (UGS) including forest/grass, water and wetland and the significant increase of builtup land. The LST of different LULC had significant differences. The buildup land and bare land had positive contribution to the LST, while the UGS had negative effect on LST, with the order of water > wetland > forest/grass. During the evolution process of different types of UGS, there was a diversified temperature pattern. The ΔLST caused by UGS loss was the most obvious, followed by the UGS exchange and the UGS extension regions. The relationship between evolution direction of different UGS types and temperature effect was quantified by TVX. Our results might help understand the mitigation effect of different UGS types on urban heat island effect and provide useful reference to the conservation of green space in coastal cities.

Key words: variable weight model, ecological security, early warning, Zhoushan Islands.