气象与环境学报2011，Vol.27Issue(2)：32-38,7.
干旱区典型绿洲热场分布规律研究——以渭干河-库车河三角洲绿洲为例
Thermal field distributions of typical oasis in arid region:A case study in Weigan and Kuqa rivers delta oasis
摘要
Abstract
Based on Landsat 7 ETM plus remote sensing data,the real land surface temperature of the typical oasis was retrieved under the clear weather of summer in arid region using a thermal infrared band of satellite image. The thermal field distributions were analyzed by using a satellite image overlaying analysis, a histogram comparison, a buffer analysis, a spatial autocorrelation analysis and profile-line analysis methods, etc.. The results indicate that the thermal field distributions of oasis are of significantly positive spatial autocorrelation. Moran's value is 0. 5489 and Z value is 48.44. At the same time,it takes on the notably local spatial cluster phenomenon. For the local study area,temperature is lower in saline-alkali soil than in the surrounding bare land under the same thermal environmental condition because of their different specific heat capacity. Mean temperature is lower 0. 59 ℃,0. 44 ℃ and 0. 26 ℃ in saline-alkali soil than in the surrounding buffer bare land of 300 m,900 m and 1500 m, respectively.However, the saline-alkali soft is often located in the center of high temperature region of bare land and seldom in the low temperature region, and the amplitude of temperature variation is not large. Consequently, the mean temperature is lower in bare land than in saline-alkali soil as a whole,and it is21.65 ℃ in water bodies,27. 86 ℃ in cultivated land,35.59 ℃ in woodland and grassland,36. 52 ℃ in town,40. 06 ℃ in bare land and 42. 07 ℃ in salinealkali soil. Temperature variation is not large in water bodies,tom,saline-alkali soil and bare land,and their thermal landscapes are simple and thermal filed distributions are even. Whereas the temperature variation is large in cultivated land and in woodland and grassland,and their thermal landscapes are complex and thermal filed distributions are uneven. There are abrupt changes in the local thermal fields. The areas of ecotone between oasis and deserr are large, which could reduce the thermal erosion of desert to oasis and protect the oasis.关键词
干旱区/热场分布/Landsat 7 ETM+/渭库绿洲Key words
Arid region/ Thermal field distribution/ Landsat 7 ETM + /Weiku oasis分类
信息技术与安全科学引用本文复制引用
张兆永,海米提·依米提..干旱区典型绿洲热场分布规律研究——以渭干河-库车河三角洲绿洲为例[J].气象与环境学报,2011,27(2):32-38,7.基金项目
国家自然科学基金(40971020)和新疆自治区科研基金(XJEDU2006I09)共同资助. （40971020）
