Transfer of fixed-N from N2-fixing cyanobacteria associated with the moss Sphagnum riparium results in enhanced growth of the moss
Transfer of fixed-N from N2-fixing cyanobacteria associated with the moss Sphagnum riparium results in enhanced growth of the moss
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DOI：
10.1007/s11104-012-1278-4
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发表时间：
2013-01-01
期刊：
影响因子：
4.9
通讯作者：
Svensson, Bo H.
中科院分区：
文献类型：
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作者：
Berg, Andreas;Danielsson, Asa;Svensson, Bo H.
尽管一般认为由相关的蓝藻固定的氮将很容易被Sphagnum用于生长，但在文献中没有经验证据。因此，研究了与金黄色葡萄球菌相关的蓝藻对氮转移的影响。在实验室条件下，带蓝藻和不带蓝藻培养河岸葡萄球菌57天。我们发现，与藻藓相关的蓝藻固氮通过向苔藓转移固定氮来影响苔藓的生长。蓝藻固定的氮超过35%被转移到新形成的苔藓生物量上，导致藻生物量比对照增加。氮含量增加的变化解释了76%的生物量增加。因此，固氮作用将直接影响海藻的固碳作用。这说明固氮调节因子将直接影响到泥鳅为主导的生态系统在碳循环中的作用。
Despite the general assumption that nitrogen fixed by associated cyanobacteria will be readily utilised for growth by the Sphagnum, no empirical evidence is available in the literature. Therefore the effects of nitrogen transfer from cyanobacteria associated with S. riparium were investigated.Cultivation of S. riparium with and without cyanobacteria was performed under laboratory conditions for 57 days.We show that nitrogen fixation by cyanobacteria associated with Sphagnum mosses, influences moss growth by transfer of fixed nitrogen to the moss. More than 35 % of the nitrogen fixed by cyanobacteria was transferred to the newly formed moss biomass and resulted in an increase in the growth of Sphagnum biomass compared to the controls. The variation in the increase of nitrogen content explained 76 % of the biomass increment.Hence, nitrogen fixation will have immediate effect on the carbon fixation by Sphagnum. This shows that factors regulating nitrogen fixation will have a direct effect on the role of Sphagnum dominated ecosystems with respect to carbon cycling.