Sulfur Constraints on the Carbon Cycle of a Blanket Bog Peatland
Sulfur Constraints on the Carbon Cycle of a Blanket Bog Peatland
复制标题
硫对沼泽泥炭地碳循环的限制
DOI:
10.1029/2021jg006435
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发表时间:
2021
期刊:
影响因子:
4.9
通讯作者:
Boothroyd I
中科院分区:
文献类型:
--
作者:
Boothroyd I
The reduction of sulfate (SO42−) represents an alternative terminal electron acceptor for the oxidation of organic matter in peat soils. The greenhouse gas budget in peatlands will be constrained by how much a peatland can utilize SO42−reduction as an alternative to methanogenesis. Using records of atmospheric deposition and stream chemistry coupled with elemental analysis of peat soil, vegetation, particulate organic matter (POM) and dissolved organic matter (DOM), this study estimated a 23‐years long sulfur (S) budget for a blanket bog‐covered catchment in the North Pennines, England. The study showed that: (a) Atmospheric deposition of total S significantly declined over the study period from 2.4 to 0.5 t S/km2/yr. (b) Long term accumulation of S into deep peat at 1 m depth averaged 127 kg S/km2/yr. (c) Total S fluvial flux peaked as 4.5 t S/km2/yr with an average of 0.7 t S/km2/yr. (d) On average, over 23 years, 0.25 t S/km2/yr were reduced to either mineral sulphides or hydrogen sulphide; however, in eight out of the 23 years the catchment was a net producer of S to the streams of the catchment. At maximum observed, S reduction capacity the peatland was capable of a net removal of 71% of atmospheric S deposition. Allowing for the efficiency of energy transfer in the redox process and the oxidation state of peat organic matter means that for every mole of SO42−reduced, 1.69 moles of CO2were produced, and an average of 0.47 t C/km2/yr are diverted from methanogenesis.
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影响因子:
6.4
作者:
Worrall, F.;Burt, T. P.
通讯作者:
Burt, T. P.
影响因子:
6.9
作者:
C. Evans;T. Chadwick;D. Norris;E. Rowe;T. Heaton;P. Brown;R. Battarbee
通讯作者:
R. Battarbee
影响因子:
6.4
作者:
F. Worrall;T. Burt;G. Clay;C. Moody
通讯作者:
C. Moody
影响因子:
5
作者:
Gao, Chuanyu;Sander, Michael;Knorr, Klaus-Holger
通讯作者:
Knorr, Klaus-Holger
影响因子:
8.9
作者:
A. Thompson;S. Bottrell
通讯作者:
S. Bottrell