使用历史和最近的NDVI时间序列证明了全球陆地生物群变化的证据
Hadi Zare Khormizi1, Hamid Reza Ghafarian Malamiri2, Sahar Alian3
1Range Management, Faculty of Natural Resources, University of Tehran, Karaj, Iran.
Heliyon
|August 9, 2023
概括
在过去的三十年中,全球植被覆盖面显著增加,在大多数生物群中观察到较早的生长季节. 植物现象学的这些变化反映了正在进行的全球气候变化和气温上升.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 遥感 遥感 遥感 遥感
背景情况:
- 气候变化对陆地生态系统和植物动态产生重大影响.
- 了解长期的植被变化对于生态系统管理至关重要.
- 卫星观测为全球生态监测提供了宝贵的数据.
研究的目的:
- 研究过去三十年全球植被覆盖面和生物群的时间变化.
- 分析植被现象学和生长季节时间的变化.
- 为了将观察到的植被变化与气候变化指标相关联.
主要方法:
- 历史 (1982-1985) 和最近 (2015-2018) 规范差异植被指数 (NDVI) 时间序列的比较.
- 应用时间序列协调分析 (HANTS) 算法来纠正缺失值和异常值的NDVI数据.
- 将NDVI时间序列分解为显著的振幅和相位元件,以分析植被动态.
主要成果:
- 在过去的三十年中,大多数生物群体的平均NDVI值显著增加,除了原和沙漠/xeric灌木.
- 北半球,特别是超过30°度的北半球,显示了植被变化的最高速率.
- 观察到平均年期的总体减小为9°,表明生长季节开始的平均转移为9天.
结论:
- 观察到的植被覆盖面和表观的变化,包括较早的生长季节,表明全球气候变化.
- 植物生长的加速和植物现象学的转变表明,这是对全球气温上升的反应.
- 持续监测植被动态对于理解和预测生态系统对气候变化的反应至关重要.
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