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| Impacts of urbanization on vegetation growth and surface urban heat island intensity in the Beijing-Tianjin-Hebei |
| ZHAO An-zhou1,2, PEI Tao2, CAO Sen3, ZHANG An-bing1, FAN Qian-qian1, WANG Jin-jie1 |
1. School of Mining and Geomatics, Hebei Universityof Engineering, Handan 056038, China;
2. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing 100101, China;
3. Key Laboratory for Geo-Environmental Monitoring of Great Bay Area, Ministry of Natural Resources, Shenzhen University, Shenzhen 518060, China |
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Abstract Based on the MODIS land surface temperature (LST) product, Enhanced Vegetation Index (EVI) product and land cover data, the impacts of urbanization on seasonal variations of vegetation growth (ΔEVI) and surface urban heat island intensity (SUHII) during 2000~2015 for thirteen major cities in the Beijing-Tianjin-Hebei region were analyzed. The results are as follows:urbanization has negative impacts on vegetation growth (ΔEVI<0) in all seasons for the thirteen major cities, and the lowest ΔEVI (-0.131) was found in summer. The highest daytime and nighttime SUHII were also found in summer, and the values was 2.594℃ and 1.859℃, respectively. The average ΔEVI decreased during 2000~2015 with an rate of -0.0038/a, -0.0033/a, -0.0045/a, and -0.0018/a (P<0.01) for the growing season, spring, summer, and autumn, respectively (P<0.01). The daytime SUHII from 2000 to 2015 exhibited significant linear increase with a rate of 0.076, 0.093, and 0.106℃/a for growing season, spring and summer, respectively (P<0.01). The nighttime SUHII from 2000 to 2015 also exhibited significant linear increase with a rate of 0.05, 0.055, 0.049, 0.054, and 0.046℃/a for growing season, spring, summer, autumn and winter, respectively (P<0.01). The ΔEVI had significant negative correlations with all-time SUHII for all the thirteen cities in the Beijing, Tianjin and Hebei region (P<0.01), ranging from -0.959to -0.592. The maximum correlation coefficient between the daytime SUHII and ΔEVI was found in the growing season (-0.959), and the maximum correlation coefficient between nighttime SUHII and ΔEVI was found in the spring (-0.936).
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Received: 20 September 2019
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