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首页> 外文期刊>The Lichenologist >Macrolichen colonization on 120-140 year old Tsuga heterophylla in wet temperate rainforests of central-interior British Columbia: a comparison of lichen response to even-aged versus old-growth stand structures
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Macrolichen colonization on 120-140 year old Tsuga heterophylla in wet temperate rainforests of central-interior British Columbia: a comparison of lichen response to even-aged versus old-growth stand structures

机译：在不列颠哥伦比亚省中部-内陆温带雨林中的120-140岁Tsuga heterophylla的大地衣定殖：比较地衣对老龄林和旧林分立结构的反应

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摘要

Canopy lichen abundance was assessed by size class on regenerating hemlocks, comparing trees of similar size and age (c. 120-140 yrs) growing in the understorey of old-growth cedar-hemlock stands with those growing in adjacent. even-aged hemlock stands (natural origin patches c. 1-3 ha in size). Five chlorolichen taxa were associated with old-growth understorey trees: Gavernularia hultenii, Hypogymnia vitatta, Parmelia hygrophila, Platismatia norvegica, and Usnea spp. Lobaria pulmonaria was the most abundant cyanolichen on regenerating hemlock in the old-growth forest stands, particularly in lower canopy (under 12 m) exposures. However, other cyanolichen taxa such as Nephroma helveticum, Sticta fulginosa, and Pseudocyphellaria anomala, reached their greatest abundance at mid-canopy (12-24 m) positions. Smaller cyanolichen thalli (<9 cm(2)) were abundant on regenerating hemlocks across all canopy positions in the old-growth forest, raising the question as to whether or not cyanolichen thalli in mid- to upper-canopy environments represented long-established individuals facing severe growth constraints, or were simply thalli that had experienced higher rates of fragmentation, and thus did not achieve larger sizes. In comparison, cyanolichens of all taxa were essentially absent from the small-patch even-aged forest stands. Given that dispersal of propagules was not likely a major limiting factor, these 120-140 year old even-age stands may not yet have attained sufficient old-growth characteristics (especially canopy microclimate and canopy through-flow enrichment) to support cyanolichen: growth. These findings have major conservation biology implications for wet interior cedar-hemlock. forests in British Columbia, where forest harvesting is creating a mosaic of even-aged stands, whose projected age at the time of next harvest (rotation age) will be 120 years or less.
机译：在再生铁杉上按尺寸等级评估了冠层地衣的丰度，比较了在老龄杉杉铁杉林下层生长的相似大小和年龄（约120-140年）的树木与在附近生长的树木。均匀年龄的铁杉（自然起源的斑块，约1-3公顷）。五种叶绿素类群与生长较矮的下层树木有关：Gavernularia hultenii，Hypogymnia vitatta，Parmelia hygrophila，Platismatia norvegica和Usnea spp。在旧林中，尤其是在较低的树冠层（低于12 m）暴露时，肺叶肺病是再生铁杉中最丰富的氰尿素。但是，其他蓝藻类群，例如Helphreticum，Sticta fulginosa和Pseudocyphellaria anomala，在树冠中部（12-24 m）位置达到最大丰度。较小的cyanolichen thalli（<9 cm（2））可以在旧林中所有树冠位置的铁杉上再生，因此提出了一个问题，即中高层树盖环境中的cyanolichen thalli是否代表了长期存在的个体面临严峻的增长限制，或者仅仅是遭受了更高破碎率的沙利，因此无法实现更大的规模。相比之下，小斑块均匀老化的林分中基本上没有所有类群的氰基苔藓。鉴于繁殖体的散布不太可能是主要的限制因素，这些120-140岁的均匀林分可能尚未达到足够的老龄特征（尤其是冠层微气候和冠层通流富集）来支持蓝藻生长。这些发现对湿室内雪松铁杉有重要的保护生物学意义。不列颠哥伦比亚省的森林，森林采伐在这些森林中形成了均匀年龄的林分，在下一次采伐时的预计年龄（轮伐年龄）将为120岁或更短。

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