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干旱区地理 ›› 2020, Vol. 43 ›› Issue (3): 726-737.doi: 10.12118/j.issn.1000-6060.2020.03.19

• 地球信息科学 • 上一篇    下一篇

祁连山MODIS LST时空变化特征及影响因素分析

邱丽莎1,2,3,何毅1,2,3,张立峰1,2,3,王文辉1,2,3,唐源蔚1,2,3   

  1. 兰州交通大学测绘与地理信息学院,甘肃 兰州 730700; 

    地理国情监测技术应用国家地方联合工程研究中心,甘肃 兰州 730700;   3 甘肃省地理国情监测工程实验室,甘肃 兰州 730700

  • 收稿日期:2020-01-07 修回日期:2020-04-03 出版日期:2020-05-25 发布日期:2020-05-25
  • 通讯作者: 张立峰(1982-),男,博士,副教授,研究方向为生态环境遥感监测
  • 作者简介:邱丽莎(1993-),女,硕士研究生,研究方向为生态环境遥感监测.E-mail:lisa_qiu@lz.acmlife.org
  • 基金资助:
    甘肃省自然科学基金( 17JR5RA095 );兰州交通大学天佑青年托举人才计划;甘肃省教育厅“兰州市主城区地面沉降 InSAR 监测”(2019A-043)资助

Spatiotemporal variation characteristics and influence factors of MODIS LST in Qilian Mountains

QIU Li-sha1,2,3,HE Yi1,2,3,ZHANG Li-feng1,2,3,WANG Wen-hui1,2,3,TANG Yuan-wei1,2,3   

  1. Faculty of GeomaticsLanzhou Jiaotong UniversityLanzhou 730700,Gansu,China;

    NationalLocal Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring,Lanzhou 730700,Gansu,China;Gansu Provincial Engineering Laboratory for National Geographic State Monitoring,Lanzhou 730700,Gansu,China

  • Received:2020-01-07 Revised:2020-04-03 Online:2020-05-25 Published:2020-05-25

摘要: 地表温度(Land Surface TemperatureLST)是研究区域尺度和全球尺度上地表能量和水平衡物理过程中不可缺少的参数。祁连山LST的时空变化规律及其影响因素模式未知。通过采用趋势分析法和相关性分析法,探讨20002017年间祁连山LSTWTBZ〗的时空变化特征及与植被的相互关系,分析各植被类型下地表温度的时空分异特征。结果表明:(1 MODIS LST产品的精度能够满足祁连山地表温度时空变化分析的要求。(2) 祁连山LST时间序列呈 “上升—下降—上升—下降”的波动变化,整体呈小幅上升趋势,以0.17 ℃·(10 a-1的速率波动上升,冬季LST上升趋势最显著(63.37%),变化率为0.22℃·(10 a-1;空间上呈西北降低东南升高的变化趋势,显著上升面积(14.89%)远大于下降面积(0.90%)。(3) 祁连山年均LSTNDVI呈负相关,显著相关区域占22.56%,夏季NDVILST的调控作用较显著(25.45%);荒漠NDVILST的影响大于其他植被类型。(4) 海拔对各植被类型LST有强烈的影响,相关性依次为荒漠>林地>草甸>耕地;然而,夏季LST与海拔的相关性因植被覆盖增加而显著降低。(5)祁连山LST上升是NDVI、海拔以及植被类型综合影响的结果。

关键词: MODIS LST NDVI, 植被类型, 祁连山

Abstract:

Land surface temperature (LST) is an important variable in the surface energy budget,significantly affecting the global agriculture,natural disastershydrology,and ecological environment.With global climate change,quantitative research on LST and its related factors become critical in both regional and global scales.The Qilian Mountains in Qinghai and Gansu Province,China,as the boundary between the Qinghai-Tibetan Plateau and Northern Hinterland,is influenced by the continental climate and the climate of the QinghaiTibetan Plateau.It belongs to the temperate semi-arid climate zone and is an important geographical and climatic boundary line in China.The study of LST in the Qilian Mountains is essential for understanding the hydrothermal cycle in the northwest and improving the fragile ecological environment.The climate pattern,vegetation,and different land-use of the Qilian Mountains have been studied comprehensively.However,the spatiotemporal variability characteristics of LST and its response mode to terrain are not yet clear.Besides,the impact of different vegetation types on LST changes need to be discussed.Based on the MODIS LST data from 2000 to 2017,this study used a linear trend method to analyze the temporal and spatial variation of LST in the Qilian Mountains and used Pearson correlation analysis to discuss the regulation of LST by different types of vegetation and the influence of altitude on its change.The results are as follows: (1) the accuracy of MODIS LST products can meet the requirements of temporalspatial variation analysis of surface temperature in the Qilian Mountains.(2) LST of the Qilian Mountains increased at a rate of 0.17 ℃·(10 a)-1with two rising periods in 2000-2003 (1.83 ℃·(10 a)-1) and 2004-2017 (0.14 ℃·(10 a)-1).The annual average WTBXLSTWTBZ increased from SouthWest to NorthEast,and the significant rising area accounts for 77.26% of the total area.The extremely significant rising areas were mainly distributed in the middle and low altitudes below 3 500 m.In addition,the winter change rate was the highest (0.22 ℃·(10 a)-1),and the warmer area reached 98.23%.The winter warming had the greatest contribution to the increase of LST in the Qilian Mountains.(3) vegetation had a significant impact on LST changes,cultivated lands had a better inhibitory effect on LST rise,and vegetation in the desert had a stronger regulatory effect on LST.Except for summerthe NDVI and LST were positively correlated in the rest of the seasonand the positively correlated areas were mainly concentrated in the highaltitude forest land.(4) the effect of altitude on LST was significantly weak during the summer due to conditions such as vegetation cover changes.The LST in the desert showed the strongest response to altitude,with strong annual fluctuations between 2 500 and 3 500 m.Meanwhile,vegetation degradation and human activities at low and medium altitudes may be the main factors accelerating the increase in LST.

Key words: MODIS LST, MODIS NDVI, vegetation type, Qilian Mountains