Microbial iron reduction and greenhouse gas production in response to organic matter amendment and temperature increase of periglacial sediments, Bolterdalen, Svalbard
Microbial iron reduction and greenhouse gas production in response to organic matter amendment and temperature increase of periglacial sediments, Bolterdalen, Svalbard
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微生物铁还原和温室气体产生响应有机质修正和冰缘沉积物温度升高，博尔特达伦，斯瓦尔巴群岛
DOI：
10.1080/15230430.2022.2097757
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Kolchev I
中科院分区：
文献类型：
--
作者：
Kolchev I
北极永久冻土储存了大量有机质 (OM)，其中微生物转化对甲烷和二氧化碳等温室气体排放做出了重大贡献。然而，峡湾景观中因冰川退缩和海平面变化而暴露的许多较年轻的沉积物缺乏重要的有机碳资源，因此它们促进温室气体排放的能力尚不清楚。因此，我们研究了温度升高（4°C 和 21°C）和 OM 对斯瓦尔巴特群岛阿德文特达伦前海洋边界内单个地点的三个不同全新世沉积单元中 Fe(III) 还原速率、CO2 生成和产甲烷速率的影响。较高的温度和 OM 添加通常会刺激所有单元中 CH4 产生和 CO2 产生以及细菌和古细菌丰度的增加，而 OM 修正对 Fe(II) 产生的同等刺激以及仅在双聚体中观察到温度升高至 21°C。我们也在海滩和三角洲沉积物中观察到 Fe(II) 的积累，但没有看到额外的 OM 或温度升高的刺激作用。有趣的是，我们观察到尽管存在大量 Fe(III)、硫酸盐和硝酸盐储量，但所有单元中 CH4 的产量虽小但显着，这表明主要由产甲烷菌使用的底物的可用性，或者发酵与产甲烷作用之间通过直接电子转移的紧密物理耦合。我们的研究清楚地说明了在研究具有复杂历史的土壤时遇到的一个重大挑战，即在狭窄的空间尺度上存在巨大的异质性。
Arctic permafrost soils store substantial reserves of organic matter (OM) from which microbial transformation contributes significantly to greenhouse gas emissions of CH4and CO2. However, many younger sediments exposed by glacier retreat and sea level change in fjord landscapes lack significant organic carbon resources, so their capacity to promote greenhouse gas emissions is unclear. We therefore studied the effects of increased temperatures (4°C and 21°C) and OM on rates of Fe(III) reduction, CO2production, and methanogenesis in three different Holocene sedimentary units from a single site within the former marine limit of Adventdalen, Svalbard. Higher temperature and OM addition generally stimulated CH4production and CO2production and an increase in Bacteria and Archaea abundance in all units, whereas an equal stimulation of Fe(II) production by OM amendment and an increase in temperature to 21°C was only observed in a diamicton. We observed an accumulation of Fe(II) in beach and delta deposits as well but saw no stimulating effect of additional OM or increased temperature. Interestingly, we observed a small but significant production of CH4in all units despite the presence of large reservoirs of Fe(III), sulfate, and nitrate, indicating either the availability of substrates that are primarily used by methanogens or a tight physical coupling between fermentation and methanogenesis by direct electron transfer. Our study clearly illustrates a significant challenge that comes with the large heterogeneity on a narrow spatial scale that one encounters when studying soils that have complex histories.
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影响因子：
3.2
作者：
A. Hodson;A. Nowak;H. Christiansen
通讯作者：
A. Hodson;A. Nowak;H. Christiansen
影响因子：
30.7
作者：
Knoblauch, Christian;Beer, Christian;Pfeiffer, Eva-Maria
通讯作者：
Pfeiffer, Eva-Maria
影响因子：
4.4
作者：
Emerson, David;Scott, Jarrod J.;Bowden, William B.
通讯作者：
Bowden, William B.
斯瓦尔巴特群岛高北极流域冰川消融的水文学和水化学
影响因子：
6.4
作者：
N. Rutter;A. Hodson;T. Irvine‐Fynn;Monica Kristensen Solås
通讯作者：
Monica Kristensen Solås
影响因子：
5.2
作者：
Schostag M;Stibal M;Jacobsen CS;Bælum J;Taş N;Elberling B;Jansson JK;Semenchuk P;Priemé A
通讯作者：
Priemé A