草原的稳定性随着越来越多的全球变化因素而下降:一个元分析
Zhaobin Song1, Yann Hautier2, Chao Wang3
1Institute of Grassland, Flowers and Ecology, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China; Urat Desert-grassland Research Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, China.
The Science of the total environment
|July 20, 2023
概括
全球环境变化 (GCFs) 降低了草原生产力的稳定性,因为更多的因素结合在一起. 这种不稳定性从影响物种稳定性转变为物种异步,随着GCF的增加.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 全球变化生物学
背景情况:
- 单一的全球变化因素 (GCFs),如缩和变暖,影响草原生产力的稳定性.
- 多个GCF对草原稳定的累积影响在很大程度上是未知的.
- 了解这些影响对于预测草原生态系统对全球变化的反应至关重要.
研究的目的:
- 研究GCF的数量如何影响草原生产力的时间稳定性.
- 在不断增加的全球资金基金下,确定社区稳定的生物和非生物驱动因素.
- 为了确定草原的稳定性是否可预测地随着越来越多的GCF而下降.
主要方法:
- 来自全球143个草原地区的673个观测结果的元分析.
- 包括7个不同的GCF来评估综合影响.
- 量化社区稳定性,物种丰富性,物种稳定性,物种异步性,干旱度指数,实验持续时间和强度之间的联系.
主要成果:
- 随着GCF数量的增加,草原社区稳定性的普遍下降被观察到.
- 不稳定的主要驱动因素发生了转变:一个GCF影响了物种稳定 (通过物种丰富),两个GCF影响了物种稳定和异步,三个GCF主要影响了物种异步.
- 在干燥的条件下和较长的实验持续时间下,GCF对稳定性的负面影响较弱,但在操纵两个或三个因素时更强.
结论:
- 越来越多的全球变化因素降低了草原生产力的稳定性.
- 这种不稳定是由从减少物种稳定性转向减少物种异步的转变所驱动的.
- 持续的全球变化威胁着草原的稳定性,因为它减少了对抗性至关重要的异步动态.
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