The Drought Response of Eastern US Oaks in the Context of Their Declining Abundance

The Drought Response of Eastern US Oaks in the Context of Their Declining Abundance
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美国东部橡树在丰度下降的情况下对干旱的反应

DOI:
10.1093/biosci/biab135
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发表时间:
2022
期刊:
影响因子:
10.1
通讯作者:
Hwang, Taehee
Hwang, Taehee
中科院分区:
生物学1区
文献类型:
--
作者:
Novick, Kimberly;Jo, Insu;D'Orangeville, Loïc;Benson, Michael;Au, Tsun Fung;Barnes, Mallory;Denham, Sander;Fei, Songlin;Heilman, Kelly;Hwang, Taehee

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北美东部的橡树(Quercus)种类正在大量减少,威胁到它们提供的许多社会生态效益。我们讨论的机制负责他们的损失,其中许多是植根于流行的观点,橡树耐旱。然后,我们综合以前发表的数据,全面审查美国东部橡树的干旱应对策略,得出的结论是,东部橡树是否耐旱完全取决于成功的度量。虽然橡树的非均质策略有时赋予气体交换和生长优势,但它使橡树暴露于破坏性的水力失效,使得橡树在干旱期间与邻近物种一样或更有可能死亡。因此,干旱频率不是一个强有力的预测历史模式的橡树丰富,虽然长期的气候和火灾频率与橡树优势的下降密切相关。橡树在干旱中生存的能力在更干燥的未来可能会变得越来越困难。
The oak (Quercus) species of eastern North America are declining in abundance, threatening the many socioecological benefits they provide. We discuss the mechanisms responsible for their loss, many of which are rooted in the prevailing view that oaks are drought tolerant. We then synthesize previously published data to comprehensively review the drought response strategies of eastern US oaks, concluding that whether or not eastern oaks are drought tolerant depends firmly on the metric of success. Although the anisohydric strategy of oaks sometimes confers a gas exchange and growth advantage, it exposes oaks to damaging hydraulic failure, such that oaks are just as or more likely to perish during drought than neighboring species. Consequently, drought frequency is not a strong predictor of historic patterns of oak abundance, although long-term climate and fire frequency are strongly correlated with declines in oak dominance. The oaks’ ability to survive drought may become increasingly difficult in a drier future.
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