| 2001-2020年天水市植被覆盖时空变化及其驱动机制研究 |
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| 引用本文： | 靳惠安,,唐志红,姚晓军,张大弘,黄登冕,张亚雄.2001-2020年天水市植被覆盖时空变化及其驱动机制研究[J].西北林学院学报,2022,37(6):215-223. |
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| 作者姓名： | 靳惠安 唐志红 姚晓军 张大弘 黄登冕 张亚雄 |
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| 作者单位： | (1.甘肃林业职业技术学院，甘肃 天水 741020；2.西北师范大学 地理与环境科学学院，甘肃 兰州 730070；3.西北大学 城市与环境学院，陕西 西安 710127) |
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| 摘 要： | 植被覆盖是衡量地表植被状况和生态系统稳定性的重要指标，基于GEE平台获取Landsat系列遥感影像，构建2001-2020年天水市NDVI序列数据，探讨天水市近20 a植被覆盖时空变化特征及驱动机制。结果表明，1）2001-2020年天水市平均植被覆盖为0.55，空间分布呈现西北低、东南高的特征。低度、较低覆盖共占全市总面积的4.1%、中度覆盖占42.9%，较高、高度覆盖共占53%。2）近20 a天水市植被覆盖呈波动上升趋势，平均增速为0.97%/a（P<0.05），植被覆盖总体为改善趋势，改善区域面积占全市总面积的65.43%，局部区域植被退化，面积仅占1.98%。3）近20 a天水市植被覆盖变化受降水和人类活动交互作用影响，降水的增加、天然林保护及退耕还林还草等工程的实施，对该市植被覆盖的提升效果显著。基于Hurst指数分析，在未来植被覆盖变化以正向持续性为主，部分区域表现为反持续性。
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| 关 键 词： | 植被覆盖 GEE 时空变化 Hurst指数 地理探测器 天水市 |
Dynamic Vegetation Cover Changes and Driving Factors from 2001 to 2020 in Tianshui City |
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| JIN Hui-an,' target="_blank" rel="external">,TANG Zhi-hong,YAO Xiao-jun,ZHANG Da-hong,HUANG Deng-mian,ZHANG Ya-xiong. Dynamic Vegetation Cover Changes and Driving Factors from 2001 to 2020 in Tianshui City[J].Journal of Northwest Forestry University,2022,37(6):215-223. |
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| Authors: | JIN Hui-an " target="_blank">' target="_blank" rel="external"> TANG Zhi-hong YAO Xiao-jun ZHANG Da-hong HUANG Deng-mian ZHANG Ya-xiong |
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| Institution: | (1.Gansu Forestry Polytechnic,Tianshui 741020,Gansu,China; 2.College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,Gansu,China; 3.College of Urban and Environmental Science,Northwest University,Xi’an 710127,Shaanxi,China) |
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| Abstract: | Vegetation cover is an important indicator of surface vegetation condition and ecosystem stability.This study acquired remote sensing images of Landsat based on GEE platform,constructed NDVI series data of Tianshui City from 2001 to 2020,and explored the spatial distribution characteristics,spatial and temporal trends,and persistence characteristics of vegetation cover in Tianshui City in the past 20 years.The results showed that 1) the average vegetation cover of Tianshui City from 2001 to 2020 was 0.55,and the spatial distribution showed the characteristics of low in the northwest and high in the southeast.The low-,medium- and high-covered vegetations accounted for 4.1%,42.9% and 53% of the total area of the city,respectively.2) In the past 20 years,the vegetation cover of the city showed a fluctuating upward trend with an average growth rate of 0.97%/a,indicating that the overall vegetation cover of the city showed an improving trend,with the improved area accounting for 65.43% of the total area of the city,and local degradation area accounted only 1.98%.3) The change in vegetation cover in the city in the last 20 years had been influenced by the interaction of precipitation and human activities.The increase in precipitation,the implementation of projects such as natural forest protection and the return of cultivated land to forest and grass had significant effects on the enhancement of vegetation cover in the city.Based on the Hurst index analysis,the vegetation cover change in the future would be mainly positive persistence,and some areas would show inverse persistence. |
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| Keywords: | vegetation coverage GEE spatial change Hurst index geodetector Tianshui City |
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