Influence of Ni, Co, Fe, and Na additions on methane production in Sphagnum-dominated Northern American peatlands
Influence of Ni, Co, Fe, and Na additions on methane production in Sphagnum-dominated Northern American peatlands
复制标题
DOI：
10.1023/a:1006461803585
复制
发表时间：
2001-01-01
期刊：
影响因子：
4
通讯作者：
Yavitt, JB
中科院分区：
文献类型：
--
作者：
Basiliko, N;Yavitt, JB
尽管以泥炭藓（苔藓）为主的北部泥炭地生态系统拥有产生甲烷（CH4）的微生物（产甲烷菌），并且是大气中CH4的重要来源，但不同系统的CH4产生速率差异很大。很少有人研究阳离子和金属元素的浓度是否可以解释这种变化。我们通过在体外培养泥炭样品，并在不添加微量金属（Fe, Ni, Co）和碱离子（Ca, Li, Na）的情况下，研究了五个地理上和功能上不同的泥炭地泥炭中CH4的产生率。在大多数矿物贫乏地区的泥炭中，金属和Na的添加比对照中观察到的增加了CH4的产生。在富含矿物质的地方，同样的处理对CH4的产生没有影响或抑制。在泥炭体外培养过程中，除添加柠檬酸盐外，所有处理都不影响厌氧呼吸（以二氧化碳产量衡量），这表明产甲烷菌，而不是整个厌氧菌群，可能受到金属元素和阳离子可用性的限制。
Although Sphagnum (moss)-dominated, northern peatland ecosystems harbor methane (CH4)-producing microorganisms (methanogens) and are a significant source of atmospheric CH4, rates of CH4 production vary widely among different systems. Very little work has been done to examine whether concentrations of cations and metal elements may account for the variability. We examined rates of CH4 production in peat from five geographically and functionally disparate Sphagnum-dominated peatlands by incubating peat samples in vitro with and without additions of trace metals (Fe, Ni, Co) and base cations (Ca, Li, Na). In peat from the most mineral poor sites, the addition of metals and Na enhanced CH4 production beyond that observed in controls. The same treatments in mineral rich sites yielded no effect or an inhibition of CH4 production. None of the treatments affected anaerobic respiration, measured as CO2 production, in the in vitro incubations of peat, except added citrate, suggesting that methanogens, and not the entire anaerobic community, can be limited by the availability of metal elements and cations.