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首页> 外文期刊>Forest Systems >Drought-induced growth decline of Aleppo and maritime pine forests in south-eastern Spain
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Drought-induced growth decline of Aleppo and maritime pine forests in south-eastern Spain

机译：干旱导致西班牙东南部阿勒颇和海洋松林的生长下降

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Climate warming may enhance the negative effects of droughts on radial growth in areas with severe water deficit, such as Mediterranean mountains under semi-arid conditions. The impacts of drought on growth decline of Mediterranean pines have not been evaluated considering species with different vulnerability and areas with contrasting climates. Dendrochronological methods were used to assess the responses of basal area increment to drought in Pinus pinaster and P halepensis plantations. We compared growth trends of trees with different defoliation degree in two sites in south-eastern Spain (Sierra de los Filabres and Sierra de Baza) with contrasting climatic conditions. In the more xeric area (Filabres) both pine species showed a sharp growth reduction in response to extreme droughts such as those observed in 1994-1995, 1999 and 2005. The radial growth of both species was enhanced by May and June precipitation of the year of tree-ring formation. P. pinaster showed higher defoliation in the xeric area (Filabres) than in the more mesic area (Baza) but needle loss was not linked to an abrupt growth reduction. Contrastingly, divergent radial growth patterns between trees showing high and low defoliation degrees were found for P halepensis in the more xeric area, where a negative relationship between recent basal area increment and defoliation was found. Pine plantations in Mediterranean mountains under semi-arid conditions are highly vulnerable to warming-induced droughts. Such marginal stands constitute valuable monitoring systems to assess the negative impacts of drought on tree growth, and to test if management strategies as thinning can mitigate the negative impacts of climate warming on similar drought-stressed forests.
机译：气候变暖可能会加剧干旱对缺水严重地区（例如半干旱条件下的地中海山脉）径向生长的负面影响。考虑到脆弱性不同的物种和气候不同的地区，尚未评估干旱对地中海松生长下降的影响。运用树轮年代学方法评估了Pinaster pinaster和halepensis人工林的基础面积增加对干旱的响应。我们比较了西班牙东南部两个地点（Sierra de los Filabres和Sierra de Baza）不同气候条件下不同落叶程度的树木的生长趋势。在较干旱的地区（Filabres），两种松树种均表现出对极端干旱的急剧减少，例如在1994-1995、1999和2005年观察到的干旱。当年5月和6月的降水增加时，两种松树的径向生长都得到了增强。年轮的形成。 P. pinaster在干旱区（Filabres）显示出较高的落叶，而在较肥沃的土壤区（Baza）显示出较高的落叶，但针头脱落与突然的生长减少没有关系。相反，在较干燥的地区发现哈利木对虾的叶片生长呈高低低散，其径向生长模式不同，而最近的基础面积增加与脱叶之间存在负相关关系。在半干旱条件下，地中海山区的松树种植园极易受到变暖引起的干旱的影响。这种边缘林分构成宝贵的监测系统，以评估干旱对树木生长的负面影响，并测试稀疏管理策略是否可以减轻气候变暖对类似干旱胁迫森林的负面影响。

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