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Tree height and leaf drought tolerance traits shape growth responses across droughts in a temperate broadleaf forest
New Phytologist ( IF 9.4 ) Pub Date : 2020-10-13 , DOI: 10.1111/nph.16996
Ian R McGregor 1, 2 , Ryan Helcoski 1 , Norbert Kunert 1, 3 , Alan J Tepley 1, 4 , Erika B Gonzalez-Akre 1 , Valentine Herrmann 1 , Joseph Zailaa 1, 5 , Atticus E L Stovall 1, 6, 7 , Norman A Bourg 1 , William J McShea 1 , Neil Pederson 8 , Lawren Sack 9, 10 , Kristina J Anderson-Teixeira 1, 3
Affiliation  

  • As climate change drives increased drought in many forested regions, mechanistic understanding of the factors conferring drought tolerance in trees is increasingly important. The dendrochronological record provides a window through which we can understand how tree size and traits shape growth responses to droughts.
  • We analyzed tree-ring records for 12 species in a broadleaf deciduous forest in Virginia (USA) to test hypotheses for how tree height, microenvironment characteristics, and species’ traits shaped drought responses across the three strongest regional droughts over a 60-yr period.
  • Drought tolerance (resistance, recovery, and resilience) decreased with tree height, which was strongly correlated with exposure to higher solar radiation and evaporative demand. The potentially greater rooting volume of larger trees did not confer a resistance advantage, but marginally increased recovery and resilience, in sites with low topographic wetness index. Drought tolerance was greater among species whose leaves lost turgor (wilted) at more negative water potentials and experienced less shrinkage upon desiccation.
  • The tree-ring record reveals that tree height and leaf drought tolerance traits influenced growth responses during and after significant droughts in the meteorological record. As climate change-induced droughts intensify, tall trees with drought-sensitive leaves will be most vulnerable to immediate and longer-term growth reductions.


中文翻译:

树高和叶片耐旱性状影响温带阔叶林干旱期间的生长反应

  • 随着气候变化导致许多森林地区干旱加剧,对赋予树木耐旱性的因素的机械理解变得越来越重要。树木年代学记录提供了一个窗口,通过它我们可以了解树木的大小和特征如何影响对干旱的生长反应。
  • 我们分析了弗吉尼亚州(美国)阔叶落叶林中 12 个物种的树轮记录,以检验关于树高、微环境特征和物种特征如何影响 60 年期间三个最强区域干旱的干旱响应的假设。
  • 耐旱性(抵抗力、恢复力和恢复力)随着树高而降低,这与暴露于更高的太阳辐射和蒸发需求密切相关。在地形湿度指数较低的地点,较大树木的潜在更大的生根量并没有带来抗性优势,但略微增加了恢复和恢复能力。在更负的水势下叶片失去膨胀(枯萎)并且在干燥时收缩较少的物种的耐旱性更高。
  • 树木年轮记录显示,气象记录中树木高度和叶片耐旱性状影响了严重干旱期间和之后的生长反应。随着气候变化引起的干旱加剧,叶子对干旱敏感的高大树木将最容易受到直接和长期生长减慢的影响。
更新日期:2020-10-13
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