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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Plant Hydraulic Stress Explained Tree Mortality and Tree Size Explained Beetle Attack in a Mixed Conifer Forest
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Plant Hydraulic Stress Explained Tree Mortality and Tree Size Explained Beetle Attack in a Mixed Conifer Forest

机译：植物液压应力解释了树死亡率和树大小解释了甲虫袭击混合针叶树林

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Drought predisposes conifer forests to bark beetle attacks and mortality. Although plant hydraulic stress mechanistically links to tree mortality, its capacity to predict trees' susceptibility to beetle attacks has not been evaluated. Further, both tree size and water supply could influence plant hydraulic stress, but their relative importance remained unknown. In this study, we modeled plant hydraulic stress of individual trees in a mixed forest of Lodgepole pine (Pinus contorta), Engelmann spruce (Picea engelmannii), and Subalpine fir (Abies lasiocarpa) in southern Wyoming, using an integrated model of plant hydraulics and hydrology, ground surveys of tree size as well as physiological and geophysical measurements. Based on the established link between plant hydraulic stress and tree mortality, we found interspecific differences in the relative importance of water availability and tree size. Pine mortality was best explained by the combination of tree size and water supply, and fir mortality was best explained by variations in water supply. We next compared the prediction of beetle attack by modeled plant hydraulic stress versus tree size and found tree size best explained beetle attack consistently for all three species. Taken together, our results suggested beetle attack was primarily influenced by beetle preference for large trees, potentially as food sources, rather than more hydraulically stressed trees. These findings highlighted the importance of integrated understanding of biotic/abiotic factors and their mechanistic pathways in order to accurately predict the sustainability of forests susceptible to drought and beetle outbreaks.
机译：干旱促使针叶树林以吠叫甲虫袭击和死亡率。虽然植物液压应力机械手册与树死亡率相连，但它预测树木对甲虫攻击的易感性的能力尚未得到评估。此外，树尺寸和供水都可以影响植物液压应力，但它们的相对重要性仍然是未知的。在这项研究中，我们使用植物液压和植物液压和南部南部的南部南部（Pinus Contorta），Engelmann Spruce（PICEANINGELMANII）和Subalpine FIR（Abies Lasiocarpa）的植物液压建模植物液压。水文，树大小的地面调查以及生理和地球物理测量。基于植物液压应力和树死亡率之间建立的联系，我们发现了水可用性和树径的相对重要性的特异性差异。通过树尺寸和供水的组合，最好解释杉木死亡率，并且最好通过供水的变化来解释杉木死亡率。我们接下来将甲虫攻击的预测通过模型植物液压压力与树尺寸，发现树尺寸最佳地解释了所有三种物种的甲虫攻击。我们的结果表明甲虫攻击主要受到大树的甲虫偏好的影响，可能是食物来源，而不是更液压的树木。这些调查结果强调了综合了解生物/非生物因素及其机械途径的重要性，以便准确地预测森林易受干旱和甲虫爆发的可持续性。

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