Habitats of circumboreal–subarctic sphagna: I. A quantitative analysis and review of species in the Caribou Mountains, northern Alberta
Habitats of circumboreal–subarctic sphagna: I. A quantitative analysis and review of species in the Caribou Mountains, northern Alberta
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环北极-亚北极泥炭藓的栖息地：I. 艾伯塔省北部驯鹿山脉物种的定量分析和回顾
作者：
D. Horton;D. Vitt;N. Slack
对阿尔伯塔省北部Cariou山脉发现的14种泥炭藓的栖息地进行了定量分析，并进行了文献综述，这是讨论这些物种在北极圈-亚北极地区的栖息地的基础。尽管这个名字蕴含着内在的含义，但Cariou山脉并不是山脉；它是一个广袤的、高耸的高原，其下方或多或少地被连续的永久冻土覆盖。在我们的研究区主要有三种生境类型：高地“树状苔原”(在高原大部分地区占主导地位)，散布着马里亚纳云杉和厚厚的底层泥炭；圆形的“解冻袋”洼地，主要是泥炭藓的地毯和一些冰块；以及溪流，由密集的灌木地带和狭窄的水道与或多或少坚固的泥炭藓草坪接壤。认为对泥炭藓物种发生有显著影响的三个梯度是：湿-干、营养-微营养和沙质营养。
A quantitative analysis of the habitats of 14 species of Sphagnum found in the Caribou Mountains of northern Alberta and a literature review are the basis for a discussion of the habitats of these species as they occur in circumboreal–subarctic regions. Despite the implication inherent in the name, the Caribou Mountains are not mountains; the formation is an extensive, elevated plateau, which is underlain by more-or-less continuous permafrost. Three habitat types predominated in our study area: an upland "treed-tundra" (which is dominant over much of the plateau) with scattered Picea mariana and a hummocky bottom layer of sphagna; rounded "thaw-pocket" depressions dominated by carpets of Sphagnum and some carices; and streams defined by a dense zone of shrubs with the narrow water channel bordered by more-or-less firm lawns of Sphagnum species. Three gradients, which are considered to have a predominant influence on the occurrence of Sphagnum species, are wet to dry, ombrotrophic to minerotrophic, and sha...