在不对称的生物质分配下,中国的草地树冠高度下降
Huaqiang Li1,2, Xinmiao Hu1, Fei Li3,4,5
1Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot, IM, China.
Nature communications
|March 3, 2026
概括
中国的草原正在缩小高度,原因是生物质分配的变化,这是由变暖和放牧驱动的. 草地树冠高度的下降会影响牲畜和生态系统的弹性.
科学领域:
- 生态生态学 生态生态学
- 遥感 遥感 遥感 遥感
- 气候科学 气候科学
背景情况:
- 草地树冠高度对于植物多样性,社区结构和畜牧资源利用效率至关重要.
- 由于复杂的物种相互作用,草地树冠高度的广泛变化尚不清楚.
- 将地表生物质脱为垂直和水平的分配提供了一种新的方法来追踪树冠高度动态.
研究的目的:
- 为了估计从2001年到2022年在中国的草地树冠高度的变化.
- 为了研究草原树冠高度观察到的变化背后的驱动因素.
- 评估草原树冠高度下降对生态的影响.
主要方法:
- 利用机器学习算法通过整合气候因素,卫星衍生指标和地面真相数据来估计草原地表生物量.
- 采用优化的线性光谱混合分析来得出草原地表生物质的水平分配.
- 分析了生物质分配,气候因素,放牧和植物多样性之间的关系.
主要成果:
- 横向生物质分配的变化是2001年至2022年间中国草原地表生物质增加的主要驱动因素.
- 生物质分配的这种转变导致草原总体树冠高度大幅下降.
- 降低树冠高度与辐射减少,变暖,放牧以及植物多样性的变化有关.
结论:
- 观察到的草地树冠高度的下降,特别是在中国,是一个复杂的现象,由多种环境因素驱动.
- 一个"化"的草原社区可能会加剧畜牧干扰的影响,降低生态系统对气候变化的抵抗力.
- 需要进一步的研究,以了解草原生态系统稳定性和功能的长期影响.
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