降水变化:在半干旱的畜牧牧草地调节植物多样性的关键因素之一
Yantao Wu1,2, Hao Li2, Jiahe Cui2,3
1College of Life Sciences, Inner Mongolia University, Hohhot, China.
Frontiers in plant science
|April 22, 2024
概括
羊在半干旱草原上放牧并不直接影响物种丰富. 然而,调整放牧强度可以通过影响植物群体结构和生物质来增强生物多样性,特别是在变化的降水条件下.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 生物多样性研究 生物多样性研究
背景情况:
- 畜牧放牧显著影响草原植物生物多样性,但影响因降雨模式而异.
- 了解放牧对物种丰富性的影响对于草原的保护至关重要,特别是在面临气候变化的半干旱地区.
研究的目的:
- 在半干旱的草原中,研究放牧强度对植物生物多样性的影响,持续8年.
- 评估降水变化如何影响放牧和物种丰富之间的关系.
- 探索社区主导地位和生物质在调解放牧对生物多样性的影响中的作用.
主要方法:
- 一个为期8年的放牧梯度实验,使用羊在半干旱的草原 (2014-2021).
- 监测植物物种丰富度,社区占主导地位,生物质和降水变化 (SPEI,PCI).
- 统计分析以确定放牧和气候因素对生物多样性的直接和间接影响.
主要成果:
- 在半干旱的Stipa草原中,没有观察到放牧对物种丰富性的直接影响.
- 增加的牧场间接增强了物种丰富性,通过促进社区的主导地位和Stipa草的庇护效应.
- 强化放牧调节了过量的生物量,放大了湿度对物种丰富性的积极影响.
- 年内降水变化 (PCI) 是这种受水限制的生态系统中物种丰富的主要驱动因素.
结论:
- 放牧强度可以调节,以增强草原的生物多样性,特别是在变化的气候条件下.
- 调整牧场管理以适应当地气候变化对于有效保护草原生物多样性至关重要.
- 在生长季节的水热同步,受降水变化的影响,通过多因素相互作用显著提高了植物物种丰富度.
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