干旱加剧了草原植被的减少,可以通过改善内蒙古,中国的土壤来缓解
Shengli Liu1, Tong Li1, Bing Liu2
1Zhengzhou Research Base, State Key Laboratory of Cotton Biology, School of Agricultural Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China.
The Science of the total environment
|November 13, 2023
概括
干旱下的草原植被下降风险受到气候和土壤的重大影响. 较高的土壤有机碳含量有助于减轻干旱影响,对适应战略至关重要.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 气候科学 气候科学
背景情况:
- 草原生态系统容易受到干旱的影响,气候和土壤因素影响干旱的严重程度和植被反应.
- 对这些驱动因素如何调节植被下降风险的有限理解,阻碍了有效的干旱适应策略.
研究的目的:
- 在中国内蒙古干旱条件下调查调节草原植被下降风险的驱动因素.
- 量化植被减少的条件概率,并确定气候,土壤和地形的相对贡献.
主要方法:
- 应用copula定理来估计植被下降的条件概率.
- 利用结构方程建模和机器学习来确定驱动器贡献.
- 对植被活动异常,水平衡和干旱严重程度的分析.
主要成果:
- 在植被活动异常和水平衡状态之间发现了正相关性.
- 干旱地区的草原植被对水资源短缺的反应更快,在中度,严重和极端干旱 (77.27%,83.83%,88.35%) 的情况下,下降风险增加.
- 气候属性是植被下降风险的主要驱动因素,其次是土壤特性和地形. 高土壤有机碳含量减轻干旱影响.
结论:
- 气候,土壤特性和地形都在复杂地调节草原植被在干旱下下降的风险.
- 环境驱动因素和植被下降之间存在非线性关系.
- 研究结果为干旱风险管理提供了洞察力,并提高了植被对极端干旱事件的抵御力.
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