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首页> 外文期刊>Ecological research >A preliminary report on the vegetation zonation of palsas in the Arctic National Wildlife Refuge, northern Alaska, USA
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A preliminary report on the vegetation zonation of palsas in the Arctic National Wildlife Refuge, northern Alaska, USA

机译：关于美国阿拉斯加北部北极国家野生动物保护区的palsas植被地带的初步报告

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摘要

We measured vegetation patterns on palsas with reference to topographic characteristics on the Arctic National Wildlife Refuge, northern Alaska, to obtain benchmark data because of the changes expected from global warming. Vegetation was examined in 60 plots of area 50 cm × 50 cm by five environmental factors: water content in the peat and duff layers, ground-water level, slope angle, depth to frozen surface, and presence of pellets and feces. Three palsas were selected for the survey, and the heights were fewer than 50 cm from the groundwater surface. Based on TWINSPAN and canonical correspondence analysis, we confirmed that clear patterns of vegetation zonation had developed within a 60-cm difference in water level. Vaccinium vitis-idaea occurred well on the top areas of palsas, while Carex aquatilis was established on the bottom areas. Sphagnum spp. were established on intermediate locations between V. vitis-idaea and C. aquatilis. The prime determinant of the vegetation zonation seems to be water content in peat and duff layers rather than water level, although the five factors that we examined interact intricately with each other.
机译：由于全球变暖的预期变化，我们参考阿拉斯加北部北极国家野生动物保护区的地形特征测量了帕尔萨斯州的植被格局，以获取基准数据。通过五个环境因素对60个面积为50 cm×50 cm的地块中的植被进行了检查：泥炭层和达夫层中的水分含量，地下水位，倾斜角，冰冻表面的深度以及是否存在颗粒和粪便。选择了三个palsas进行调查，并且距地下水面的高度不到50 cm。基于TWINSPAN和规范对应分析，我们确认了在水位差60厘米之内已经形成了清晰的植被分区模式。越桔越好发生在palsas的顶部，而Carex aquatilis则位于底部。泥炭藓在V. vida-idaea和C. aquatilis之间的中间位置建立了。植被分区的主要决定因素似乎是泥炭和矮泥层中的水分含量，而不是水位，尽管我们研究的五个因素相互之间有着复杂的相互作用。

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