Laboratory of Plant Ecology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, 9000, Ghent, Belgium.
Grupo de Investigación Sistemas Naturales e Historia Forestal, Universidad Politécnica de Madrid, 28040, Madrid, Spain.
Nat Commun. 2022 Jan 10;13(1):28. doi: 10.1038/s41467-021-27579-9.
Heatwaves exert disproportionately strong and sometimes irreversible impacts on forest ecosystems. These impacts remain poorly understood at the tree and species level and across large spatial scales. Here, we investigate the effects of the record-breaking 2018 European heatwave on tree growth and tree water status using a collection of high-temporal resolution dendrometer data from 21 species across 53 sites. Relative to the two preceding years, annual stem growth was not consistently reduced by the 2018 heatwave but stems experienced twice the temporary shrinkage due to depletion of water reserves. Conifer species were less capable of rehydrating overnight than broadleaves across gradients of soil and atmospheric drought, suggesting less resilience toward transient stress. In particular, Norway spruce and Scots pine experienced extensive stem dehydration. Our high-resolution dendrometer network was suitable to disentangle the effects of a severe heatwave on tree growth and desiccation at large-spatial scales in situ, and provided insights on which species may be more vulnerable to climate extremes.
热浪对森林生态系统造成了不成比例的强烈影响，有时甚至是不可逆转的影响。在树木和物种层面以及大的空间尺度上，这些影响仍未得到很好的理解。在这里，我们使用来自 53 个地点的 21 个物种的高时间分辨率树木测高仪数据集合，研究了 2018 年破纪录的欧洲热浪对树木生长和树木水分状况的影响。与前两年相比，2018 年的热浪并没有持续降低树木的年生长量，但由于水分储备的消耗，树木的临时收缩程度是前两年的两倍。与阔叶树相比，在土壤和大气干旱梯度上，针叶树的夜间再水化能力较差，这表明它们对短暂压力的恢复能力较差。特别是挪威云杉和苏格兰松经历了广泛的茎干脱水。我们的高分辨率树木测高仪网络适合在大空间尺度上原位分离严重热浪对树木生长和蒸腾作用的影响，并提供了有关哪些物种可能更容易受到极端气候影响的见解。
