美国蒙大拿州冰川国家公园冰缘条带形地表植物功能属性和土壤微生物随坡位变化（英文）

编号 zgly0001675795

文献类型 期刊论文

文献题名 美国蒙大拿州冰川国家公园冰缘条带形地表植物功能属性和土壤微生物随坡位变化（英文）

作者 APPLEMarthaElizabeth  RICKETTSMacyKara  MARTINAliceCaroline 

作者单位 DepartmentofBiologicalSciences  MontanaTechnologicalUniversity  DepartmentofBotany  TheUniversityofWyoming  DivisionofBiologicalSciences  TheUniversityofMontana 

母体文献 Journal of Geographical Sciences 

年卷期 2019年07期

年份 2019 

分类号 Q948  S154.3 

关键词 alpineplants  plantfunctionaltraits  microbes  periglacialpatternedground  climatechange  GlacierNationalPark  Montana 

文摘内容 The retreating snowfields and glaciers of Glacier National Park, Montana, USA, present alpine plants with changes in habitat and hydrology. The adjacent and relic periglacial patterned ground consists of solifluction terraces of green, vegetation-rich stripes alternating with sparsely vegetated brown stripes. We established georeferenced transects on striped periglacial patterned ground for long-term monitoring and data collection on species distribution and plant functional traits at Siyeh Pass and at Piegan Pass at Glacier National Park. We documented species distribution and calculated the relative percent cover(RPC) of qualitative functional traits and used 16 S rRNA from soil samples to characterize microbial distribution on green and brown stripes. Plant species distribution varied significantly and there were key differences in microbial distribution between the green and brown stripes. The rare arctic-alpine plants Draba macounii, Papaver pygmaeum, and Sagina nivalis were restricted to brown stripes, where the RPC of xeromorphic taprooted species was significantly higher at the leading edge of the Siyeh Pass snowfield. Brown stripes had a higher percentage of the thermophilic bacteria Thermacetogenium and Thermoflavimicrobium. Green stripes were co-dominated by the adventitiously-rooted dwarf shrubs Salix arctica and the possibly N-fixing Dryas octopetala. Green stripes were inhabited by Krummholz and seedlings of Abies lasiocarpa and Pinus albicaulus. Prosthecobacter, a hydrophilic bacterial genus, was more abundant on the green stripes, which had 6,524 bacterial sequences in comparison to the 1,183 sequences from the brown stripes. While further research can determine which functional traits are critical for these plants, knowledge of the current distribution of plant species and their functional traits can be used in predictive models of the responses of alpine plants to disappearing snowfields and glaciers. This research is important in conservation of rare arctic-alpine species on periglacial patterned ground.