地形学调节了树衰退的多十年趋势的气候敏感性
Ana López-Ballesteros1, Emilio Rodríguez-Caballero2, Gerardo Moreno3
1Department of Agricultural and Forest Systems, and the Environment, Agrifood Research and Technology Centre of Aragon (CITA), Zaragoza, Spain.
Global change biology
|September 9, 2023
概括
荷尔姆树 (Quercus ilex L.) 的衰退正在增加,特别是在森林中. 地形和夏季降雨相互作用,推动脱叶趋势,更的地形显示出更高的脆弱性.
科学领域:
- 生态与环境科学 生态与环境科学
- 林业和农业学 林业和农业学
- 气候变化影响研究 影响研究
背景情况:
- 全球范围内森林减少事件正在增加,树 (Quercus ilex L.) 在整个欧洲显示出令人担忧的趋势.
- 之前的研究发现,干旱和土壤病原体是树衰退的主要驱动因素.
- 树木健康损失的多因素性质,涉及非生物和生物因素之间的相互作用,需要调查经常被忽视的非生物影响.
研究的目的:
- 评估土地利用 (森林与草原),地形和气候极端如何共同影响树脱叶趋势.
- 分析了西班牙近三十年 (1987-2014) 的树衰退的时空模式.
- 确定地中海地区潜在的树木衰退热点及其潜在原因.
主要方法:
- 从1987年到2014年,西班牙134个地块的树脱叶趋势的分析.
- 统计评估土地利用,地形和夏季降水异常之间的相互作用.
- 森林与萨凡纳土地覆盖类型以及不同地形梯度的脱叶趋势的比较.
主要成果:
- 在134个小木地块中的119个地块中观察到日益增长的脱叶趋势.
- 与草原相比,森林的脱叶趋势在森林中明显高.
- 地形和夏季降水异常之间的相互作用解释了树木的衰退:森林的地形在干燥的夏季增加了树叶的脱落,而平坦的草原则表现出相反的关系.
结论:
- 当地的地形显著影响着森林弹性和树木衰退模式.
- 在更的地形上,水压和在更平坦的地形上,浸水引起的病原体脆弱性可能是树衰退的明显因果机制.
- 结果可以帮助识别地中海地区潜在的树木衰退热点及其主要驱动因素.
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