Moss-cyanobacteria associations as biogenic sources of nitrogen in boreal forest ecosystems.
Moss-cyanobacteria associations as biogenic sources of nitrogen in boreal forest ecosystems.
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DOI：
10.3389/fmicb.2013.00150
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发表时间：
2013
影响因子：
5.2
通讯作者：
Deluca TH
中科院分区：
文献类型：
--
作者：
Rousk K;Jones DL;Deluca TH
大气氮（N）的生物固定是有效氮进入生态系统的主要途径。在氮有限的北方森林中，大量的氮被与苔藓共存的蓝藻固定，占氮输入总量的 50%。在这篇综述中，我们综合了关于羽毛苔藓-蓝细菌关联中氮固定驱动因素的报告，以更深入地了解它们在生态系统氮循环中的作用。苔藓-蓝藻群落中的氮固定受到氮输入的抑制，因此，显着的固定仅发生在低氮沉积区域。虽然已经表明，实验室和现场的人工添加氮会抑制苔藓-蓝藻群落中的氮固定，但进入系统的氮的类型和数量对氮固定的影响不同。 N2 固定的另一个主要驱动因素是蓝藻寄主苔藓的湿度状态，其中潮湿条件促进 N2 固定。苔藓的水文状态会经历很大的波动，在短短几个小时内经历显着的自然干燥和再湿润循环，尤其是在夏季，这可能会损害通过固定氮气输入系统的氮气。然而，也许最核心的问题尚未得到解答，那就是苔藓中固定氮的命运。蓝藻可能会泄漏氮，但这些氮是否转移到土壤中，如果转移到土壤中，转移的速度和时间尺度如何，尚不清楚。尽管我们对氮固定的驱动因素有了越来越多的了解，但苔藓-蓝藻关联在生态系统氮循环中所发挥的作用仍然悬而未决。此外，苔藓和蓝藻之间的关系迄今为止尚不清楚，值得进一步研究。
The biological fixation of atmospheric nitrogen (N) is a major pathway for available N entering ecosystems. In N-limited boreal forests, a significant amount of N2 is fixed by cyanobacteria living in association with mosses, contributing up to 50% to the total N input. In this review, we synthesize reports on the drivers of N2 fixation in feather moss-cyanobacteria associations to gain a deeper understanding of their role for ecosystem-N-cycling. Nitrogen fixation in moss-cyanobacteria associations is inhibited by N inputs and therefore, significant fixation occurs only in low N-deposition areas. While it has been shown that artificial N additions in the laboratory as well as in the field inhibit N2 fixation in moss-cyanobacteria associations, the type, as well as the amounts of N that enters the system, affect N2 fixation differently. Another major driver of N2 fixation is the moisture status of the cyanobacteria-hosting moss, wherein moist conditions promote N2 fixation. Mosses experience large fluctuations in their hydrological status, undergoing significant natural drying and rewetting cycles over the course of only a few hours, especially in summer, which likely compromises the N input to the system via N2 fixation. Perhaps the most central question, however, that remains unanswered is the fate of the fixed N2 in mosses. The cyanobacteria are likely to leak N, but whether this N is transferred to the soil and if so, at which rates and timescales, is unknown. Despite our increasing understanding of the drivers of N2 fixation, the role moss-cyanobacteria associations play in ecosystem-N-cycling remains unresolved. Further, the relationship mosses and cyanobacteria share is unknown to date and warrants further investigation.
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影响因子：
3.8
作者：
Croisier, Emmanuel;Rempt, Martin;Pohnert, Georg
通讯作者：
Pohnert, Georg
影响因子：
4.9
作者：
Berg, Andreas;Danielsson, Asa;Svensson, Bo H.
通讯作者：
Svensson, Bo H.
影响因子：
3.3
作者：
Ayres, Edward;van der Wal, Rene;Bardgett, Richard D.
通讯作者：
Bardgett, Richard D.
DOI：
10.1139/b91-345
发表时间：
1991-12-01
期刊：
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE
影响因子：
--
作者：
CHAPIN, DM;BLISS, LC;BLEDSOE, LJ
通讯作者：
BLEDSOE, LJ
影响因子：
2
作者：
Dickson, LG
通讯作者：
Dickson, LG