The ecological role of moss in a polar desert: implications for aboveground-belowground and terrestrial-aquatic linkages
The ecological role of moss in a polar desert: implications for aboveground-belowground and terrestrial-aquatic linkages
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DOI：
10.1007/s00300-014-1465-2
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发表时间：
2014-05-01
期刊：
影响因子：
1.7
通讯作者：
Virginia, Ross A.
中科院分区：
文献类型：
--
作者：
Ball, Becky A.;Virginia, Ross A.
南极洲的麦克默多干谷是地球上最寒冷和最干燥的栖息地之一。由于该地区缺乏维管植物，苔藓是地上初级生产的主要形式，对土壤地球化学循环具有潜在的重要贡献，但对其生态作用知之甚少。为了确定苔藓和土壤性质之间的关系，相关的土壤地球化学，我们采样都从不同的位置在干旱山谷。苔藓的存在进行了比较，土壤性质，我们测量的可塑性苔藓化学计量（C：N：P）跨梯度的养分供应。结果表明，许多土壤性质显着不同的苔藓的存在，特别是电导率和pH值，但没有强有力的证据表明，这是由苔藓的存在，而不是固有的条件，其中mossesoffer.There是很大的变化，苔藓化学计量，与一些显着的差异网站之间，但一般网站内的变异性大于网站之间的变化。结果表明，苔藓营养的主要来源是从土壤中，而不是水，但与任何一个营养源的相关性都很弱，这表明大量的可塑性苔藓化学计量和养分吸收。
The McMurdo Dry Valleys of Antarctica is one of the coldest and driest habitats on the planet. As vascular plants are absent in this region, moss is the main form of aboveground primary production with a potentially important contribution to biogeochemical cycling, yet little is known about their ecological role. To determine the relationship between moss and soil properties relevant to biogeochemistry, we sampled both from a variety of locations in the Dry Valleys. Moss presence was compared to soil properties, and we measured the plasticity of moss stoichiometry (C:N:P) across gradients in nutrient availability. Results demonstrate that many soil properties significantly differed with moss presence, particularly conductivity and pH, but there is no strong evidence that this is caused by the moss presence and not the conditions inherent to the microsites where moss was found. There is great variability in moss stoichiometry, with some significant differences between sites, but generally variability within sites is larger than variation among sites. Results suggest that the main source of moss nutrients is from the soil, rather than water, but correlations with any one nutrient source are weak, suggesting a great deal of plasticity in moss stoichiometry and nutrient uptake.