Turnover of labile and recalcitrant soil carbon differ in response to nitrate and ammonium deposition in an ombrotrophic peatland

TitleTurnover of labile and recalcitrant soil carbon differ in response to nitrate and ammonium deposition in an ombrotrophic peatland
Publication TypeJournal Article
Year of Publication2010
AuthorsCurrey P.M, Johnson D., Sheppard L.J, Leith I.D, Toberman H., van der Wal R., Dawson L.A, Artz R.RE
JournalGlobal Change Biology
Volume16
Pagination2307-2321
Date PublishedAug
ISBN Number1354-1013
Accession NumberWOS:000279443800013
Keywordscarbon turnover, enzyme activity, extracellular enzyme-activity, litter decomposition, microbial community composition, nitrogen deposition, peatland, phenol oxidase activity, phosphorus, sphagnum, substrate-induced respiration, summer drought, term nitrogen deposition, vegetation, whole soil
Abstract

The effects of 4 years of simulated nitrogen deposition, as nitrate (NO(3)-) and ammonium (NH(4)+), on microbial carbon turnover were studied in an ombrotrophic peatland. We investigated the mineralization of simple forms of carbon using MicroResp (TM) measurements (a multiple substrate induced respiration technique) and the activities of four soil enzymes involved in the decomposition of more complex forms of carbon or in nutrient acquisition: N-acetyl-glucosaminidase (NAG), cellobiohydrolase (CBH), acid phosphatase (AP), and phenol oxidase (PO). The potential mineralization of labile forms of carbon was significantly enhanced at the higher N additions, especially with NH(4)+ amendments, while potential enzyme activities involved in breakdown of more complex forms of carbon or nutrient acquisition decreased slightly (NAG and CBH) or remained unchanged (AP and PO) with N amendments. This study also showed the importance of distinguishing between NO(3)- and NH(4)+ amendments, as their impact often differed. It is possible that the limited response on potential extracellular enzyme activity is due to other factors, such as limited exposure to the added N in the deeper soil or continued suboptimal functioning of the enzymes due to the low pH, possibly via the inhibitory effect of low phenol oxidase activity.

Short TitleGlobal Change BiolGlobal Change Biol
Alternate JournalGlobal Change Biol
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Univ Aberdeen, Aberdeen Ctr Environm Sustainabil, Aberdeen AB24 3UU, Scotland
Macaulay Inst, Aberdeen AB24 3UU, Scotland
Univ Aberdeen, Inst Environm & Biol Sci, Aberdeen AB24 3UU, Scotland
Ctr Ecol & Hydrol, Penicuik EH26 0QB, Midlothian, Scotland
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