Abstract

The last years, Central European forests have suffered from drought as a direct consequence of climate change. All these forests have a long management history and it lies in the landowner’s responsibility to replant damaged forests. Hence, landowners and the government are searching currently for species suitable to replant in areas affected by tree die-offs. It is a matter of fact that good knowledge of drought resistance of species is a critical measure for the current replanting efforts. We determined a widely recognized trait for leaf drought tolerance (leaf water potential at turgor loss point at full hydration, π_tlp) in 41 woody species native or introduced in Central Europe. The osmometric rapid assessment method was used to measure the leaf osmotic potential at full hydration (π_osm) of sun-exposed leaves and converted to π_tlp. Mean π_tlp of the native species was −2.33 ± 0.33 MPa. The less negative π_tlp was found in the introduced species Aesculus hypocastania and was at −1.70 ± 0.11 MPa. The most negative π_tlp, and thus the potentially highest drought tolerance, were found in the introduced species Pseudotsuga menzesii and was at −3.02 ± 0.14 MPa. High or less negative π_tlp is associated with lower drought tolerance, whereas low or more negative π_tlp stands for higher resistance to drought stress. For example, the two native species Illex aquifolium and Alnus glustinosa are species naturally associated with moist habitats and are characterized by the least negative π_tlp of −1.75 ± 0.02 and −1.76 ± 0.03 MPa, respectively.

中文翻译：

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来自中欧的41种本地和引进树木和灌木物种在充分水合时的叶片膨大损失点

摘要

过去几年，由于气候变化的直接结果，中欧森林遭受了干旱。所有这些森林都有悠久的经营历史，这归于土地所有者负责补植受损森林的责任。因此，土地所有者和政府目前正在寻找适合在受树木砍伐影响的地区重新种植的树种。事实上，对物种的抗旱性的充分了解是当前重新种植努力的关键措施。我们（在全水化，膨压损点水势测定叶耐旱性被广泛认可的特质π _TLP）的41种木本植物中天然的或中欧介绍。渗透压快速评估法用于测量完全水合时的叶片渗透势（π _OSM日光暴露叶），并转换成π _TLP。平均数π _TLP天然物种的是-2.33±0.33兆帕。少负π _TLP是在引入的物种中发现的七叶树hypocastania并且是在-1.70±0.11兆帕。最负π _TLP，因而可能最高的耐旱性，在引进的物种被发现黄杉menzesii并在-3.02±0.14兆帕。高或少负π _TLP与较低的耐旱性有关，而低或负π _TLP代表对干旱胁迫的更高抵抗力。例如，两个本地物种鱿鱼尖头叶和桤木glustinosa自然与潮湿的栖息地相关物种和由至少负的特征在于π _TLP的分别-1.75±0.02和-1.76±0.03兆帕。