Plant communities of a tussock tundra landscape in the Brooks Range Foothills, Alaska
Plant communities of a tussock tundra landscape in the Brooks Range Foothills, Alaska
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阿拉斯加布鲁克斯山脉山麓草丛苔原景观的植物群落
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发表时间：
1994
期刊：
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通讯作者：
N. Auerbach
中科院分区：
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作者：
M. Walker;D. Walker;N. Auerbach
我们提出了第一个植被分析从北极山麓的北方阿拉斯加根据布劳恩-布兰凯的方法。数据来自Imnavait Creek和Toolik Lake地区。我们专注于协会的干和中的高地表面和中度积雪的网站;其他高地植物群落，即那些blockfields，非分类圈，和水的轨道，进行了简要描述。总的玛丽区系信息是在一个天气表。五个协会和15个社区类型被暂定为七个现有的句法分类类。群落描述按照生境排列：干燥暴露的酸性场地、潮湿酸性浅雪床、潮湿非酸性雪床、潮湿酸性高地和潮湿非酸性高地。许多群落是先前描述的来自绿色土地和欧洲北极地区的协会的白令人替代者。所描述的群落广泛分布于阿拉斯加北方。用去趋势对应分析法分析了这些关联与复杂环境梯度的关系。群落组成主要受中地形关系（坡度和土壤湿度）、微尺度干扰和与长期景观演变有关的因素控制。
We present the first vegetation analysis from the Arctic Foothills of northern Alaska according to the Braun- Blanquet approach. The data are from the Imnavait Creek and Toolik Lake regions. We focus on associations of dry and mesic upland surfaces and moderate snow accumulation sites; other upland plant communities, i.e. those of blockfields, non- sorted circles, and water tracks, are briefly described. Sum- mary floristic information is presented in a synoptic table. Five associations and 15 community types are tentatively placed into seven existing syntaxonomical classes. The com- munity descriptions are arranged according to habitat: dry exposed acidic sites, moist acidic shallow snowbeds, moist non-acidic snowbeds, moist acidic uplands, and moist non- acidic uplands. Many of the communities are Beringian vicariants of associations previously described from Green- land and the European Arctic. The described communities have a widespread distribution in northern Alaska. The rela- tionship of the associations to complex environmental gradi- ents are analyzed using Detrended Correspondence Analysis. Community composition is controlled primarily by meso- topographic relationships (slope position and soil moisture), microscale disturbances, and factors related to long-term land- scape evolution.