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首页> 外文期刊>Forest Ecology and Management >Edge effects on epiphytic lichens in remnant stands of managed landscapes in the eastern boreal forest of Canada
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Edge effects on epiphytic lichens in remnant stands of managed landscapes in the eastern boreal forest of Canada

机译：在加拿大东部北方森林中受管理景观残留林分上附生地衣的边缘效应

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摘要

In the managed boreal landscapes of Quebec (eastern Canada), corridors of riparian buffers and upland strips are often the only remnants of productive mature and overmature forests left in the harvested landscape. Because corridors are narrow and have multiple edges, edge effects on forest structure and on epiphytic lichens may be proportionally stronger in these linear remnant habitats than in patchy forest remnants. In this study, we compared the overall biomass of different epiphytic lichen taxa (Bryoria spp., Usnea spp., and Evernia mesomorpha) in four different forest types (linear cutblock separators, riparian buffers, large forest remnants, and control interior forests). We also examined whether edge effects on lichen biomass were present in two types of forest remnants (linear cutblock separators and large forest remnants). Epiphytic lichens were sampled along one transect perpendicular to clear-cut edge in 10 sites within each forest type. We used nested ANCOVA to compare lichen biomass among distance from edge classes and remnant forest types. Bryoria biomass was higher in large forest remnants and interior forests than in riparian buffers and cutblock separators, whereas Evernia biomass was higher in riparian buffers than in other forest types. Usnea biomass did not vary among forest types. On a transect into the forest, Bryoria biomass at 0 and 15 m from the edge was significantly lower than at 30 m. The biomass of Evernia and Usnea was significantly lower at the edge of the clear-cut (0 m) compared to interior plots (30 m). Our results suggest that a landscape where only cutblock separators and riparian buffers are left as remnant mature and overmature forests will not maintain epiphytic lichen communities of mature and overmature interior forests anywhere in the landscape, especially the high biomass of Bryoria observed in interior forests. Wider cutblock separators would be required to maintain core habitat conditions for species associated with late seral stages.
机译：在魁北克（加拿大东部）受管理的北方景观中，沿岸缓冲带和高地带的走廊通常是收割后的景观中仅有的生产性成熟和过早森林的残留物。由于走廊狭窄且具有多个边缘，因此在这些线性残留栖息地中，对森林结构和附生地衣的边缘效应可能比斑块森林残留物中的边缘效应成比例更大。在这项研究中，我们比较了四种不同森林类型（线性切块分离器，河岸缓冲带，大森林残留物和对照内陆森林）中不同附生地衣类群（Bryoria spp。，Usnea spp。和Evernia mesomorpha）的整体生物量。我们还检查了两种类型的森林残留物（线性切块分离器和大型森林残留物）是否存在对地衣生物量的边缘效应。在每种森林类型中的10个位置，沿垂直于清晰边缘的一个样带取样附生地衣。我们使用嵌套的ANCOVA来比较边缘类和残留森林类型之间的距离中的地衣生物量。大型森林残留物和内陆森林中的苔藓生物量高于河岸缓冲带和切块分隔器，而河岸缓冲带中的爱佛尼亚生物量高于其他森林类型。松萝生物量在森林类型之间没有变化。在进入森林的一个样带中，距离边缘0和15 m处的苔藓菌生物量明显低于30 m。与内部样地（30 m）相比，纯净边缘（0 m）处的Evernia和Usnea生物量明显较低。我们的结果表明，仅留下砍伐分离器和河岸缓冲带作为剩余成熟和过早森林的景观将不会在景观中的任何地方维持成熟和过早内部森林的附生地衣群落，尤其是在内部森林中观察到的苔藓菌的高生物量。需要较宽的切块分离器，以保持与晚血清期有关的物种的核心生境条件。

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