蒙古主要的牧场生产率变化原因是气候,而不是过度放牧
Avralt-Od Purevjav1, Tumenkhusel Avirmed2, Steven W Wilcox3
1World Bank Group, Washington, DC, USA.
Science (New York, N.Y.)
|September 18, 2025
概括
气候变化,而不是过度放牧, 显著影响牧场的健康. 尤其是蒙古,气温上升和天气变化是牧场初级生产率长期变化的主要驱动因素.
科学领域:
- 生态学
- 环境科学
- 气候科学
背景情况:
- 牧场是全球超过20亿人的重要生态系统.
- 牧场的退化是一个重大问题,
- 气候变化可能对牧场健康构成更大的威胁.
研究的目的:
- 准实验地估计畜牧群体规模,天气和气候变化对牧场初级生产力的因果关系.
- 区分短期气候波动与长期气候变化的影响.
- 分析蒙古不同生态区的这些影响.
主要方法:
- 使用了从1984年到2024年的蒙古的空间分类,全国数据.
- 为了准实验性分析,利用了牲畜放牧地的季节性变化.
- 估计群体规模,天气和气候变化对初级生产力的因果关系.
主要成果:
- 群体大小对初级生产率产生了轻微而显著的负面影响,其年间的频率因生态区而异.
- 天气波动的影响比群体大小还要大.
- 在十年规模上,群体大小的影响消失了,而长期变化则由温度影响主导.
结论:
- 气候变化,特别是气温上升,是蒙古牧场初级生产率长期变化的主要驱动因素.
- 虽然群体规模有短期影响,但并不是长期退化的主要原因.
- 了解这些驱动因素对于有效的牧场管理和保护战略至关重要.
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