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• 研究报告 • 上一篇    下一篇

贵州省地表温度的遥感反演评价及时空分异规律

胡泽银1,2,3,王世杰1,3,白晓永1,3*,李琴1,2,3,吴路华1,2,3,钱庆欢1,3,4,肖建勇1,3,4,陈飞1,3,4,曾成1,3,4   

  1. (1中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550081;2中国科学院研究生院, 北京 100049;3中国科学院普定喀斯特生态系统观测研究站, 贵州普定 562100; 4贵州师范大学地理与环境科学学院, 贵阳 550001)
  • 出版日期:2018-09-10 发布日期:2018-09-10

Remote sensing retrieval and spatial-temporal differentiation of land surface temperature in Guizhou Province.

HU Ze-yin1,2,3, WANG Shi-jie1,3, BAI Xiao-yong1,3*, LI Qin1,2,3, WU Lu-hua1,2,3, QIAN Qing-huan1,3,4, XIAO Jian-yong1,3,4, CHEN Fei1,3,4, ZENG Cheng1,3,4   

  1. (1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; 2University of Chinese Academy of Sciences, Beijing 100049, China; 3Puding Karst Ecosystem Observation and Research Station, Chinese Academy of Sciences, Puding 562100, Guizhou, China; 4School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550001, China).
  • Online:2018-09-10 Published:2018-09-10

摘要: 地表温度(LST)是全球变化研究中的关键参数,对生态系统和生物地球化学等具有重要研究意义。然而,目前针对复杂地形区域的地表温度的研究仍非常欠缺,贵州省是典型的西南喀斯特高原地区,地形复杂,生态系统脆弱。本研究以贵州省为研究区,基于多年MODIS遥感数据,结合地面观测气象数据,使用相关分析、趋势分析、R/S分析和地理探测器等方法,进行地表温度的时空演变规律研究。结果表明:(1)MODIS LST与实测气温具有良好的线性相关性;(2)地表温度在空间上呈南高北低的空间分布格局;(3)在时间上,地表温度的年际波动较大,最大差值为2.06 ℃·a-1,年内主要呈现单峰型分布;(4)海拔800 m以上区域,地表温度随海拔升高而降低;海拔800 m以下区域,地表温度与海拔呈非线性关系;(5)不同土地利用类型的地表温度之间存在显著差异,且最大差值为1.3 ℃。综上所述,研究区地表温度空间分布与纬度分布相对一致,受到海拔和纬度双重控制,且与土地利用类型有关。

关键词: 禁牧, 氮循环, 氮储量, 功能基因, 半干旱草地

Abstract: Land surface temperature (LST) is a crucial parameter for global change investigation, which is significant to ecosystem and biogeochemical researches. However, studies on LST of complex terrain areas are limited. Guizhou Province is a typical karst landform with complex terrain and fragile ecosystems. Based on multi-year MODIS remote sensing data combined with meteorological data in Guizhou Province, the temporal and spatial changes of LST were studied by using correlation analysis, trend analysis, R/S analysis and geographic detector. The results showed that: (1) The MODIS LST displayed a linear correlation with near surface temperature; (2) LST showed a spatial distribution of the south-high and north-low; (3) The interannual fluctuation of LST was large with the maximum difference of 2.06 ℃·a-1, while the annual variation was mainly in unimodal distribution; (4) LST decreased with increasing elevation in the regains with >800 m above sea level, and exhibited a nonlinear relationship with elevation in the regions with <800 m above sea level; (5) There were significant differences in LST among different land-use types, with a maximum difference of 1.3 ℃. In summary, the spatial distributions of LST in the study area were relatively consistent with that of latitude, which was impacted by elevation and latitude and was related to land-use types.

Key words: nitrogen storage, semiarid grassland, functional genes, nitrogen cycling, grazing exclusion