Bacterial and fungal community structure in Arctic tundra tussock and shrub soils.
Bacterial and fungal community structure in Arctic tundra tussock and shrub soils.
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DOI：
10.1111/j.1574-6941.2006.00260.x
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发表时间：
2007-02
影响因子：
4.2
通讯作者：
M. Wallenstein;S. McMahon;J. Schimel
中科院分区：
文献类型：
--
作者：
M. Wallenstein;S. McMahon;J. Schimel
对阿拉斯加州图利克湖的草丛、草丛、灌丛有机土壤和矿物土壤中的真菌和细菌群落结构进行了研究。通过构建部分16S和18S rRNA基因克隆文库研究群落结构。在2004年8月生长季结束时和2005年6月土壤解冻后对土壤群落进行了采样。不同植被类型的群落差异很大，但在门的水平上，草丛和草丛间的土壤群落非常相似。群落在门和亚门水平上的样本日期之间相对稳定，但在更精细的系统发育尺度上存在显著差异。细菌群落以酸性细菌为主，灌丛土壤以变形杆菌为主。这些结果似乎与之前的工作一致，表明灌木土壤含有活性的、生物可利用的C组分，而草丛土壤由更顽强的底物主导。草丛真菌群落中子囊菌的比例高于灌丛土壤，而接合菌门在灌丛土壤中的比例更高。最近关于北极灌木丰富度增加的文件表明，气候变化可能会改变土壤微生物群落及其功能。
Fungal and bacterial community structure in tussock, intertussock and shrub organic and mineral soils at Toolik Lake, Alaska were evaluated. Community structure was examined by constructing clone libraries of partial 16S and 18S rRNA genes. The soil communities were sampled at the end of the growing season in August 2004 and just after the soils thawed in June 2005. The communities differed greatly between vegetation types, although tussock and intertussock soil communities were very similar at the phyla level. The communities were relatively stable between sample dates at the phyla and subphyla levels, but differed significantly at finer phylogenetic scales. Tussock and intertussock bacterial communities were dominated by Acidobacteria, while shrub soils were dominated by Proteobacteria. These results appear consistent with previous work demonstrating that shrub soils contain an active, bioavailable C fraction, while tussock soils are dominated by more recalcitrant substrates. Tussock fungi communities had higher proportions of Ascomycota than shrub soils, while Zygomycota were more abundant in shrub soils. Recent documentation of increasing shrub abundance in the Arctic suggests that soil microbial communities and their functioning are likely to be altered by climate change.