2000-2019年青海省同仁市NDVI时空动态变化
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国家重点研发计划“沟道工程对流域水沙变化影响及其贡献率”(2016YFC0402404);水利部财政预算项目“全国水土流失动态监测”(126201340009150001)。


Temporal and Spatial Dynamics of NDVI in Tongren City, Qinghai Province from 2000 to 2019
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    [目的] 研究地处黄土高原最西端,与青藏高原接壤的青海省同仁市植被时空动态变化,为黄土高原与青藏高原过渡地带的生态保护和治理提供参考。[方法] 基于MODIS-NDVI数据,采用线性趋势回归、Hurst指数,从时间和空间尺度分析了同仁市2000—2019年NDVI动态变化特征,对NDVI与土地利用和海拔高度的关系进行初步分析,并对NDVI未来变化趋势进行预测。[结果] ①2000—2019年同仁市NDVI整体呈波动上升趋势,平均增速为0.027/10 a。NDVI高值区域增加明显,主要分布在东西部山区,NDVI值介于0.8~1的区域由2000年的388.63 km2增加到2019年的1 066.92 km2。②NDVI上升的区域为2 925.21 km2,占全市面积的84.42%,广泛分布在隆务河谷地区和周围山区,其中林地626.13 km2,草地2094.11 km2。③NDVI值下降的区域为539.79 km2,占全市面积的15.58%,少部分分布在隆务河河谷地区,大部分在西部和南部山区。以同仁市冻融侵蚀海拔下限3 583 m为界,海拔3 583 m以上区域NDVI下降的面积占全市NDVI下降总面积的70.93%。④未来NDVI值持续上升的区域占全市面积的79.17%,持续下降的区域占13.13%。[结论] 过去20 a,同仁市NDVI整体上升,高覆盖度植被面积明显增加,NDVI下降区域主要分布在高海拔地区。未来同仁市NDVI整体上将持续上升,但仍有部分区域存在下降趋势。

    Abstract:

    [Objective] The spatio-temporal dynamic changes of vegetation in Tongren City, Qinghai Province (located at the westernmost end of the Loess Plateau and the bordering Qinghai-Tibet Plateau) were studied in order to provide references for ecological protection and management of the transition zone between the two plateaus.[Methods] The characteristics of dynamic vegetation changes in space and time from 2000 to 2019 were investigated using linear trend regression and the Hurst index based on MODIS-NDVI data. Also, a preliminary analysis of relationships between NDVI changes and land uses and altitudes was conducted, and future trends in NDVI variation were predicted.[Results] ① NDVI values in Tongren City showed a growth rate of 0.027/10 yr over the past 20 years. Areas with high NDVI values increased significantly, and were mainly located in the eastern and western mountainous areas. The areas with NDVI values varying between 0.8 and 1.0 increased from 388.63 km2 in 2000 to 1 066.92 km2 in 2019. ② NDVI increased over an area of 2 925.21 km2, accounting for 84.42% of the city's area. This area was widely distributed in the Longwu River valley and the surrounding mountainous area, including 626.13 km2 of forest land and 2 094.11 km2 of grassland. ③ The area where NDVI decreased was 539.79 km2, accounting for 15.58% of the city's area. Most of this area was located in the high-altitude area in the western and southern mountainous area, while a small part of the area was in the Longwu River valley. Taking the lowest altitude of freezing and thawing erosion (3 583 m) as a limit, the area of decreasing NDVI was located above 3 583 m, and accounted for 70.93% of the total area that showed decreasing NDVI. ④ In the future, NDVI will generally continue to increase, with the area of increasing NDVI accounting for 79.17% of the city area, while the area where NDVI will decrease will account for 13.13% of the area of the city.[Conclusion] During the past 20 years, NDVI has generally increased in Tongren City, with high-coverage vegetation increasing significantly. The areas where NDVI decreased were mainly located in high-altitude areas. In the future, NDVI values for Tongren City will continue to increase as a whole, but some areas will still show decreases in NDVI.

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徐佳,高云飞,刘伟伟,党恬敏,曾建青.2000-2019年青海省同仁市NDVI时空动态变化[J].水土保持通报,2021,41(5):115-122

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  • 收稿日期:2021-07-19
  • 最后修改日期:2021-08-05
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  • 在线发布日期: 2021-10-25