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首页> 外文会议>National convention of the Society of American Foresters >Management guidelines for the maintenance of Eastern forests threatened by hemlock woolly adelgid (Adelges tsugae).
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Management guidelines for the maintenance of Eastern forests threatened by hemlock woolly adelgid (Adelges tsugae).

机译：通过铁杉羊毛威胁威胁的东林（Adelges Tsugae）维护管理指南。

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摘要

Eastern hemlock (Tsuga canadensis (L) is the most shade-tolerant and long-lived tree species in Eastern North America (Godman and Lancaster 1990). Because hemlock tolerates low light, it grows in all canopy layers. Overstocked stands are common, but hemlock can grow slowly in these crowded conditions providing a unique habitat for wildlife and an aesthetic appeal to landowners. The hemlock woolly adelgid (Adelges tsugae) (HWA), is a non-native invasive insect that feeds on eastern hemlock and Carolina hemlock {Tsuga caroliniana Engelm.). HWA currently is established in 17 eastern states, covering approximately 50% of eastern hemlock's range (Suoto et al. 1996), and is causing tree decline and wide-ranging tree mortality. Mortality can occur quicklyand uniformly throughout a stand or can occur slowly and in patches for more than a decade. Indirect ecosystem effects of HWA include changes in vegetation structure and composition, changes in wildlife communities, altered nutrient cycling rates, and changes in aquatic communities. Because widespread chemical control is economically unfeasible and biocontrols are still being tested, scientists and managers are investigating strategies to increase hemlock survival.
机译：东部铁杉（Tsuga Canadensis（L）是北美洲东部（戈德曼和兰开斯特）的宽容和长期的树木（1990）。因为铁杉公差低光，它在所有遮篷层中生长。积压展台很常见，但铁杉可以在这些拥挤的条件下缓慢生长，为野生动物提供独特的栖息地和对土地所有者的美学吸引力。铁杉羊毛羊毛（Adelges Tsugae）（HWA）是一种非本地侵入性昆虫，其在东部铁杉和卡罗莱纳铁杉奖{Tsuga Caroliniana Engelm。）。 HWA目前已成立于17个东部国家，占据东部铁杉的范围的大约50％（Suoto等，1996），并导致树下降和广泛的树死亡率。死亡率可以在整个展台上均匀地均匀发生，或者可以缓慢地发生斑块超过十年。 HWA的间接生态系统效应包括植被结构和组成的变化，野生动物社区的变化，改变营养循环率和水生社区的变化。由于广泛的化学控制是经济上不可行的，并且仍在测试生物控制，科学家和经理正在调查增加铁杉生存期的策略。

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