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首页> 外文期刊>Journal of Arboriculture >DETECTING STRESS IN SOUTHERN LIVE OAK (QUERCUS VIRGINIANA) AND SAND LIVE OAK (Q. VIRGINIANA VAR. GEMINATA)
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DETECTING STRESS IN SOUTHERN LIVE OAK (QUERCUS VIRGINIANA) AND SAND LIVE OAK (Q. VIRGINIANA VAR. GEMINATA)

机译：检测南部鲜活橡树（栎属栎）和沙质鲜活橡树（栎属栎）的应力

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摘要

Walt Disney World (Florida U.S.) arborists evaluated three affordable and easy-to-use measuies of tree stress--leaf chlorophyll concentration leaf temperature, and water potential--for use in delecting water and physical injury stress in live oak. Theevaluation included observations of trees being relocated and experiments of girdled trees and trees subjected to various watering regimes. Leaf chlorophyll concentration was largely unresponsive to stress and unlikely to be useful as a stress indicatorin sand live oak and southern live oak. Both water potential and leaf temperature were responsive to imparted stressors and have potential as indicators of stress in sand live oak and southern live oak. Water potential exhibited a predictable and consistent response to both water stress and physical injury Inadequately watered live oaks and oaks subject to relocation bad lower water potentials than oaks with an adequate water regime or in situ. By contrast live oaks injured by girdling had higher waterpotential than norigirdled trees. Leaf temperature was less sensitive and less robust at detecting stress than water potential but still potentially useful. Leaf temperature was greater for a nonirrigated relocated tree than an irrigated relocated treeand for relocated trees when rootballed and immediately after relocation. Leaf temperature was largely unresponsive to girdling or mild water stress.
机译：沃尔特迪斯尼世界（美国佛罗里达州）的树木学家评估了三种经济实惠且易于使用的树木胁迫措施-叶片叶绿素浓度叶温和水势-用于缓解活橡树的水分和物理伤害胁迫。评估包括观察树木被重新安置以及环剥的树木和经受各种浇水方式的树木的实验。叶片的叶绿素浓度在很大程度上对压力无响应，不太可能在沙生橡树和南部橡树中用作胁迫指标。水势和叶片温度均对所施加的胁迫响应，并且有潜力作为沙生橡树和南部橡树的胁迫指标。水势对水分胁迫和人身伤害均表现出可预测且一致的响应。浇水不足的活橡树和易移位的橡树的水势比具有适当水分制度或原地的橡树的水势低。相比之下，因环剥而受伤的橡树的水势比未生香的树高。与水势相比，叶片温度在检测压力方面不那么敏感，也较不稳固，但仍然很有用。当进行植球和搬迁后，未灌溉的乔迁树的叶片温度要比灌溉的乔迁树和乔迁的树高。叶片温度对环剥或轻度水分胁迫基本无反应。

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