地球信息科学学报 ›› 2019, Vol. 21 ›› Issue (3): 445-454.doi: 10.12082/dqxxkx.2019.180316

• 遥感科学与应用技术 • 上一篇    下一篇

福建省地表温度与植被覆盖度的相关性分析

李娅丽1(), 汪小钦1,*(), 陈芸芝1, 王苗苗2   

  1. 1. 福州大学空间数据挖掘和信息共享教育部重点实验室,卫星空间信息技术综合应用国家地方联合工程研究中心,福州 350108
    2. 中国科学院地理科学与资源研究所,北京 100101
  • 收稿日期:2018-07-04 修回日期:2019-01-02 出版日期:2019-03-15 发布日期:2019-03-15
  • 通讯作者: 汪小钦 E-mail:luckyliyali@163.com;wangxq@fzu.edu.cn
  • 作者简介:

    作者简介:李娅丽(1992- ),女,山东菏泽人,硕士生,研究方向为遥感信息处理与应用技术。E-mail: luckyliyali@163.com

  • 基金资助:
    国家重点研发计划项目(2017YFB0504203);中央引导地方发展专项(2017L3012);海西政务大数据应用协同创新中心资助项目

The Correlation Analysis of Land Surface Temperature and Fractional Vegetation Coverage in Fujian Province

Yali LI1(), Xiaoqin WANG1(), Yunzhi CHEN1, Miaomiao WANG2   

  1. 1. Key Laboratory of Spatial Data Mining & Information Sharing of Ministry of Education, National & Local Joint Engineering Research Center of Satellite Geospatial Information Technology, Fuzhou University, Fuzhou 350108, China
    2. Institude of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2018-07-04 Revised:2019-01-02 Online:2019-03-15 Published:2019-03-15
  • Supported by:
    National Key Research and Development Program of China, No.2017YFB0504203;Central Guide Local Science and Technology Development Project, No.2017L3012;Program of Fujian Collaborative Innovation Center for Big Data Applications in Governments.

摘要:

地表温度(Land surface Tenperature, LST)和植被覆盖度(Fractional Vegetation Coverage, FVC)是生态环境变化的重要指标因子,研究两者的时空变化及相互关系对评价区域生态环境建设、改善区域生态环境具有重要意义。本文以福建省为研究区域,利用2001-2015年MODIS 11A2 LST和13Q1 NDVI数据,在时序数据重构的基础上对福建省LST时空变化及LST与FVC的相互关系进行分析。结果表明:①2001-2015年福建省LST总体呈轻微下降趋势,尤其是2010年之后其LST明显降低。LSTFVC的空间分布具有较好的负相关一致性:在FVC较高的区域,LST值较低;在FVC较低的区域,LST较高。② LSTFVCDEM和纬度均成负相关关系,且负相关性在一年之中随着月份的变化而呈规律性增加或降低。夏季FVC对LST的负相关性最大为0.7,冬季FVC对LST的负相关性降低为0.4。③LST随着FVC增加而降低的趋势呈现分段线性关系,存在“FVC拐点”。“FVC拐点”前后随着FVC增加LST的降低速率在夏季 “先慢后快”,而在冬季则“先快后慢”。春秋两季,LST随着FVC增加而降低的速率在“FVC拐点”前后差异变小。在夏季,当FVC大于0.4时,FVC每增加0.1可降低LST约0.77 °C,降温效果大约是FVC小于0.4时的2倍。因此如果要有效地降低夏季地表高温,要使地表植被覆盖大于40%,才能较好的发挥植被的降温的作用。④在1-8月份,FVCLST的负相关作用存在滞后性,FVC变化对滞后一个月的LST时空分布影响更大。研究成果对福建省生态环境建设与评估具有一定的意义,对于发挥植被对区域高温抑制作用提供了重要的参考依据。

关键词: 地表温度(LST), 植被覆盖度(FVC), 时空变化, LST与FVC相互关系, 福建省

Abstract:

Land surface temperature (LST) and fractional vegetation coverage (FVC) are important indicators of ecological environment changes. Studying the temporal and spatial variations of LST and FVC as well as their interaction in Fujian Province are of great significance to the evaluation of ecological environment construction and improvement of regional ecological environment. In this study, the temporal and spatial variations of LST in Fujian Province and the interaction between LST and FVC are analyzed, based on the reconstruction time series data of MODIS 11A2 LST and 13Q1 NDVI from 2001-2015. The results showed that: (1) The overall LST in Fujian Province presented a slight downward trend from 2001 to 2015, and the downward trend of LST is more pronounced after 2010. The spatial distribution of LST and FVC had a good negative correlation consistency, which implies the LST value is lower in the higher area while the LST is higher in the lower FVC area. (2) LST is negatively correlated with FVC, DEM and latitude. And their negative correlation was increased or decreased regularly with the change of months in a year .The negative correlation between FVC and LST was higher in summer and became lower in winter with the correlation coefficient reduced from 0.7 to 0.4. (3) The decreasing trend of LST with the increase of FVC is piecewise linear and has an obvious "FVC inflection point". In front and behind "FVC inflection point", the decreasing trends of LST with the increase of FVC are "slowly first and fast afterwards" in summer and "fast followed by slow "in winter. Moreover, the difference of LST decreasing rate with the increase of FVC becomes smaller in spring and autumn. In summer, when FVC is greater than 0.4, the LST can reduce about 0.77 °C with FVC value increase 0.1, and the cooling effect is about twice as much as that when FVC is less than 0.4. Therefore, if we want to effectively reduce LST in summer, we should make the surface vegetation cover more than 40%。Only in this way can vegetation play a better role in cooling. (4) From January to August, the negative correlation of FVC on LST has a lag, and vegetation change has a greater impact on the spatial and temporal distribution of the next month's LST. This study has a certain significance for the construction and evaluation of ecological environment in Fujian Province, and provide an important reference for the development of vegetation to suppress regional high temperature.

Key words: Land surface temperature (LST), Fractional vegetation coverage (FVC), Temporal and spatial variation, Interrelationship between LST and FVC, Fujian province