Carbon fluxes through bacterial communities on glacier surfaces
Carbon fluxes through bacterial communities on glacier surfaces
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DOI：
10.3189/172756411795932092
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发表时间：
2010-01-01
影响因子：
2.9
通讯作者：
Psenner, Roland
中科院分区：
文献类型：
--
作者：
Anesio, Alexandre M.;Sattler, Birgit;Psenner, Roland
关于冰川表面微生物群落活动的信息很少，尽管有越来越多的证据表明它们强烈影响这些栖息地的生物地球化学。我们测量了北极、南极和高山冰川冰尘洞中的细菌丰度和产量，以估计异养细菌在冰川生态系统碳预算中的作用。我们的研究结果表明，在冰川表面上有一个活跃的细菌群落，倍增时间从几个小时到几百天不等，这取决于冰川和冰孔内的位置（水或沉积物）。然而，细菌的产量仅与类似栖息地的群落呼吸的已发表文献值的2-3%相似，这表明其他类型的微生物（例如真核生物）也可能在冰川的C循环中发挥作用。我们估计，只有高达7%的有机碳cryoconite沉积物中的异养细菌群落每年利用，这表明冰川表面可以积累有机碳，这C可能是重要的生态地球化学活动下游相邻的生态系统。
There is very little information about the activity of microbial communities on the surface of glaciers, though there is an increasing body of evidence to show that they strongly influence the biogeochemistry of these habitats. We measured bacterial abundance and production in cryoconite holes on Arctic, Antarctic and Alpine glaciers in order to estimate the role of heterotrophic bacteria within the carbon budget of glacial ecosystems. Our results demonstrate an active bacterial community on the surface of glaciers with doubling times that vary from a few hours to hundreds of days depending on the glacier and position (water or sediments) within the cryoconite hole. However, bacterial production is only similar to 2-3% of the published literature values of community respiration from similar habitats, indicating that other types of microbes (e.g. eukaryotic organisms) may also play a role in the C cycle of glaciers. We estimate that only up to 7% of the organic C in cryoconite sediments is utilized by the heterotrophic bacterial community annually, suggesting that the surface of glaciers can accumulate organic carbon, and that this C may be important for biogeochemical activity downstream to adjacent ecosystems.