干旱的强度和干旱后的降水量决定了中国内蒙古的沙漠草原中的植被恢复
Xiangyun Li1, Zhaobin Song1, Ya Hu2
1Urat 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; Key Laboratory of Stress Physiology and Ecology in Cold and Arid Region, Gansu Province, Lanzhou 730000, China.
The Science of the total environment
|October 13, 2023
概括
极端干旱严重影响草原的生产力. 脉冲干旱允许地面净初级生产率 (ANPP) 完全恢复,而压力干旱则没有. 在这两种干旱后,社区结构迅速恢复.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 气候变化研究 气候变化研究
背景情况:
- 极端干旱事件威胁着全球生态系统,草原的稳定性是一个关键问题.
- 了解干旱后草原恢复机制对于生态系统管理至关重要.
- 沙漠草原生态系统面临着极端气候变化的风险日益增加.
研究的目的:
- 在极度干旱后调查内蒙古沙漠草原生态系统中的植被恢复.
- 为了比较地面净初级生产率 (ANPP) 和社区结构在不同干旱强度 (压力和脉冲) 下的恢复.
- 确定影响ANPP干旱后恢复的关键因素.
主要方法:
- 一个为期四年的极端干旱模拟 (2015-2018) 用压力 (66%降水减少) 和脉冲 (100%降水减少) 处理.
- 一个随后的四年复苏监测期 (2019-2022年).
- 使用结构方程建模 (SEM) 分析地面净初级生产率 (ANPP),社区结构 (物种丰富,植物密度,高度) 和土壤含水量.
主要成果:
- 压力和脉冲干旱都大大减少了ANPP,原因是植物生长和生产率下降.
- 在脉冲干旱后,ANPP完全恢复,但在压力干旱后没有恢复.
- 社区结构 (丰富度,密度,高度) 在干旱后的一年内恢复,有助于ANPP恢复.
- 降低土壤含水量和植物密度是干旱期间ANPP减少的主要驱动因素.
结论:
- 干旱的强度和降水量显著影响了退化沙漠草原的ANPP恢复.
- 脉冲干旱允许ANPP完全恢复,而压力干旱导致持续减少.
- 了解干旱影响和恢复机制对于有效的草原管理和保护至关重要.
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