Effects of Nitrate and Labile Carbon on Denitrification of Southern Temperate Forest Soils

The pressure for anthropogenic land use changes and logging of temperate forests in southern Chile is rapidly increasing, with its potentially high impacts on the capacity of soils to retain important limiting elements. We tested the hypotheses that logging increases the denitrification rates and ni...

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Autores principales:	Pérez,Cecilia A, Carmona,Martín R., Fariña,José M., Armesto,Juan J.
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2010
Materias:	acetylene inhibition assay lowland evergreen forests selective logging nitrogen availability
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200008
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spelling	oai:scielo:S0718-583920100002000082018-10-01Effects of Nitrate and Labile Carbon on Denitrification of Southern Temperate Forest SoilsPérez,Cecilia ACarmona,Martín R.Fariña,José M.Armesto,Juan J. acetylene inhibition assay lowland evergreen forests selective logging nitrogen availability The pressure for anthropogenic land use changes and logging of temperate forests in southern Chile is rapidly increasing, with its potentially high impacts on the capacity of soils to retain important limiting elements. We tested the hypotheses that logging increases the denitrification rates and nitrate and C limitation of denitrifiers activity would be higher in soils of unlogged, old-growth forests than in soils of logged forests. Potential denitrification rates were estimated by the acetylene inhibition assay in intact soil cores in laboratory short-term aerobic incubations using the following treatments: 0.7 mmol NO3-N addition, the same nitrate addition plus 23.3 mmol C-glucose, and controls (no additions) with and without 10% v/v acetylene. Forest logging did not significantly change soil nitrate content and C lability (e.g. soil C/N ratio). A nested two-factor ANOVA for repeated measures showed that denitrification was enhanced by nitrate plus labile C additions in both forests, suggesting that in both logged and unlogged forests labile C and nitrate limit denitrifiers activity. Increases were up to one order of magnitude when glucose was added to nitrate treated soils; from 373 ± 113 to 3353 ± 451 µg N2O-N m-2 d-1 in the unlogged, old-growth forest and from 1 369 ± 941 to 12 192 ± 7 474 µg N2O-N m-2 d-1 in the logged forest. We conclude that, denitrification would be enhanced in logged forests in the longer term due to a greater nitrate and labile C availability of both in disturbed soils.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.70 n.2 20102010-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200008en10.4067/S0718-58392010000200008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	acetylene inhibition assay lowland evergreen forests selective logging nitrogen availability
spellingShingle	acetylene inhibition assay lowland evergreen forests selective logging nitrogen availability Pérez,Cecilia A Carmona,Martín R. Fariña,José M. Armesto,Juan J. Effects of Nitrate and Labile Carbon on Denitrification of Southern Temperate Forest Soils
description	The pressure for anthropogenic land use changes and logging of temperate forests in southern Chile is rapidly increasing, with its potentially high impacts on the capacity of soils to retain important limiting elements. We tested the hypotheses that logging increases the denitrification rates and nitrate and C limitation of denitrifiers activity would be higher in soils of unlogged, old-growth forests than in soils of logged forests. Potential denitrification rates were estimated by the acetylene inhibition assay in intact soil cores in laboratory short-term aerobic incubations using the following treatments: 0.7 mmol NO3-N addition, the same nitrate addition plus 23.3 mmol C-glucose, and controls (no additions) with and without 10% v/v acetylene. Forest logging did not significantly change soil nitrate content and C lability (e.g. soil C/N ratio). A nested two-factor ANOVA for repeated measures showed that denitrification was enhanced by nitrate plus labile C additions in both forests, suggesting that in both logged and unlogged forests labile C and nitrate limit denitrifiers activity. Increases were up to one order of magnitude when glucose was added to nitrate treated soils; from 373 ± 113 to 3353 ± 451 µg N2O-N m-2 d-1 in the unlogged, old-growth forest and from 1 369 ± 941 to 12 192 ± 7 474 µg N2O-N m-2 d-1 in the logged forest. We conclude that, denitrification would be enhanced in logged forests in the longer term due to a greater nitrate and labile C availability of both in disturbed soils.
author	Pérez,Cecilia A Carmona,Martín R. Fariña,José M. Armesto,Juan J.
author_facet	Pérez,Cecilia A Carmona,Martín R. Fariña,José M. Armesto,Juan J.
author_sort	Pérez,Cecilia A
title	Effects of Nitrate and Labile Carbon on Denitrification of Southern Temperate Forest Soils
title_short	Effects of Nitrate and Labile Carbon on Denitrification of Southern Temperate Forest Soils
title_full	Effects of Nitrate and Labile Carbon on Denitrification of Southern Temperate Forest Soils
title_fullStr	Effects of Nitrate and Labile Carbon on Denitrification of Southern Temperate Forest Soils
title_full_unstemmed	Effects of Nitrate and Labile Carbon on Denitrification of Southern Temperate Forest Soils
title_sort	effects of nitrate and labile carbon on denitrification of southern temperate forest soils
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200008
work_keys_str_mv	AT perezceciliaa effectsofnitrateandlabilecarbonondenitrificationofsoutherntemperateforestsoils AT carmonamartinr effectsofnitrateandlabilecarbonondenitrificationofsoutherntemperateforestsoils AT farinajosem effectsofnitrateandlabilecarbonondenitrificationofsoutherntemperateforestsoils AT armestojuanj effectsofnitrateandlabilecarbonondenitrificationofsoutherntemperateforestsoils
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Effects of Nitrate and Labile Carbon on Denitrification of Southern Temperate Forest Soils

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