乌鲁木齐城市地表温度时空变化与贡献度研究

伴随着新疆首府乌鲁木齐市经济快速发展,人口持续增加、城市化进程不断加快,地表温度也发生极其显著的变化.以乌鲁木齐市中心城区为研究对象,利用1990—2018年的4期Landsat卫星影像和中国科学院土地利用/覆被分类数据,采用地表温度反演、重心转移模型、空间聚类分析以及计算贡献度指数等方法,定量研究乌鲁木齐市城市化进程...

Spatial-temporal Patterns of Land Surface Temperature and Contribution in Urumqi,China

With the rapid economic development of Urumqi,the capital of Xinjiang,the population continues to increase,the urbanization process is accelerating,and the surface temperature has also changed significantly.Taking Urumqi central urban area as the research object,this paper uses the four phases of Landsat satellite imageries from 1990 to 2018 and land use/cover classification data of Chinese Academy of Sciences.The temporal and spatial pattern changes of land surface temperature and the contribution degree of land use/cover to thermal environment in Urumqi during urbanization were quantitatively studied by using land surface temperature inversion,center of gravity transfer model,spatial cluster analysis and contribution index calculation.The results show that:(1)The area of relative surface temperature classes in the study area increased in<0,0?2 and>8 grades,while the area of 2?4,4?6 and 6?8 decreased from 1990 to 2018.The largest increase in area is the relative surface temperature level of<0,and the largest area reduction is 6?8 grade.From the spatial distribution,the temperature distribution increases from the middle to the outside;(2)The center of gravity of the region with relative surface temperature grade of 0?2,2?4 and 4?6 in the study area showed a trend of first southeast,then West,and then northeast.The center of gravity of the area with relative surface temperature grade>8 first moved to the southwest and then to the northeast.The center of gravity of the region with relative surface temperature grade<0 moved northward and the higher the grade,the more east it was.The results show that the relative surface temperature level<0 is distributed in the middle,the center of gravity transfer distance is the longest in the relative surface temperature level>8,and the shortest in the area of relative surface temperature level 0?2 from 1990 to 2018;(3)The results show that LST in the study area has a strong agglomeration effect in space,which shows that the higher the level,the stronger the agglomeration;And(4)the area of construction land and water area in the study area increased,while the other types decreased from 1990 to 2018.The largest area growth was construction land,and the area of cultivated land decreased the most.Grassland,construction land,unused land,forest land,water area and cultivated land were the main contribution index of each land use/cover type from large to small.Grassland,construction land and unused land were positive contribution,while forest land,water area and cultivated land were negative contribution.The contribution index is closely related to the area.