| Title | Turnover of labile and recalcitrant soil carbon differ in response to nitrate and ammonium deposition in an ombrotrophic peatland |
| Publication Type | Journal Article |
| Year of Publication | 2010 |
| Authors | Currey P.M, Johnson D., Sheppard L.J, Leith I.D, Toberman H., van der Wal R., Dawson L.A, Artz R.RE |
| Journal | Global Change Biology |
| Volume | 16 |
| Pagination | 2307-2321 |
| Date Published | Aug |
| ISBN Number | 1354-1013 |
| Accession Number | WOS:000279443800013 |
| Keywords | carbon 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 Title | Global Change BiolGlobal Change Biol |
| Alternate Journal | Global Change Biol |
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