White ash (Fraxinus americana) survival in the core of the emerald ash borer (Agrilus planipennis) invasion
White ash (Fraxinus americana) survival in the core of the emerald ash borer (Agrilus planipennis) invasion
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白蜡树 (Fraxinus americana) 在白蜡螟 (Agrilus planipennis) 入侵的核心中生存
DOI：
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发表时间：
2019
影响因子：
2.2
通讯作者：
D. McCullough
中科院分区：
文献类型：
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作者：
M. Robinett;D. McCullough
尽管灾难性的灰（白蜡树属）在2000年代中期在密歇根州东南部的绿白蜡螟（EAB）（Agrilus planipennis Fairmaire）入侵的中心观察到的死亡率，我们注意到许多活的白色白蜡（Fraxinus americana L.）在这个地区的一些森林里。2015年，我们在11个县的28个白色火山灰地点清点了上层树木和再生。白色白蜡树的存活率为0%至100%。总体而言，75%的821白色灰树，从10.0至44.0厘米直径的胸高，和66%的白色灰断面积，从0.3至3.5 m2·ha-1，是活的。几乎所有活的白色白蜡树都有EAB定植的迹象，但83%有健康的冠层（≤10%冠层枯死）。绿色白蜡树记录在27个站点，但92%被杀死的EAB。模型选择表明，白色灰生存的变化与白色灰丰度和距离的网站从原来的EAB震中，但不绿色灰相关的变量或距离的网站从亚洲寄生虫释放或恢复的位置。再生层占主导地位的白色灰，这表明一些白色灰人口可能会持续在入侵后的地区。
Despite catastrophic ash (Fraxinus spp.) mortality observed by the mid-2000s in the epicenter of the emerald ash borer (EAB) (Agrilus planipennis Fairmaire) invasion in southeast Michigan, we noticed numerous live white ash (Fraxinus americana L.) in some forests in this region. In 2015, we inventoried overstory trees and regeneration in 28 white ash sites spanning 11 counties. White ash survival ranged from 0% to 100% of stems. Overall, 75% of 821 white ash trees, ranging from 10.0 to 44.0 cm diameter at breast height, and 66% of the white ash basal area, ranging from 0.3 to 3.5 m2·ha–1, were alive. Nearly all live white ash had signs of previous EAB colonization, but 83% had healthy canopies (≤10% canopy dieback). Green ash trees were recorded in 27 sites, but 92% were killed by EAB. Model selection indicated that variation in white ash survival was related to white ash abundance and distance of sites from the original EAB epicenter but not to green ash related variables or to the distance of sites from the Asian parasitoid release or recovery locations. Regeneration strata were dominated by white ash, suggesting that some white ash populations may persist in post-invasion areas.