绘制以前未被发现的树木的地图,揭示了泛热带树木覆盖的忽视的变化
Shidong Liu1,2,3, Jie Zhang2,4, Li Wang5
1State Key Laboratory of Remote Sensing and Digital Earth, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China.
Nature communications
|July 2, 2025
概括
以前未被发现的树木覆盖面 (PUTC) 占全球树木覆盖面的很大一部分. 改进的检测方法对于准确的气候变化减缓和可持续的土地管理策略至关重要.
科学领域:
- 地球观测 地球观测
- 遥感 遥感 遥感 遥感
- 生态生态学 生态生态学
背景情况:
- 准确的树木覆盖检测对于可持续的土地管理和气候变化缓解至关重要.
- 现有的全球数据集往往忽略了重要的树木覆盖面,特别是在非森林地区.
- 高分辨率卫星数据为更精确的绘图提供了潜力.
研究的目的:
- 开发一种自动检测算法,利用高分辨率卫星数据绘制泛热带树木覆盖的地图.
- 识别和分析以前未被发现的树木覆盖面 (PUTC) 的变化.
- 量化气候和人类因素对树木覆盖动态的影响.
主要方法:
- 开发一种自动检测算法,利用具有<5m分辨率的卫星数据.
- 在2015-2022年期间绘制泛热带树木覆盖的地图.
- 敏感性分析以确定气候因素和人类影响的贡献.
主要成果:
- 以前未被发现的树木覆盖面 (PUTC) 占泛热带地区总树木覆盖面的17.31 ± 1.78%.
- 在2015年至2022年期间,树木覆盖面净减少了61.05±2.36 Mha.
- 树木覆盖的变化在PUTC地区最明显,通常被10米分辨率数据集遗漏.
- 43.98%的树木覆盖增加与降水增加有关,而56.03%的损失是由于人为影响.
结论:
- 忽视PUTC导致低估总树木覆盖面和不准确的变化分析.
- 在有效的气候变化减缓和可持续的土地管理方面,精细的树木覆盖地图绘制至关重要.
- 改进的映射提高了生物地球化学循环建模和植被气候相互作用研究的准确性.
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