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Titolo:
NITROGEN MINERALIZATION IN UPLAND PRECAMBRIAN SHIELD CATCHMENTS - CONTRASTING THE ROLE OF LICHEN-COVERED BEDROCK AND FORESTED AREAS
Autore:
LAMONTAGNE S;
Indirizzi:
UNIV WATERLOO,DEPT EARTH SCI WATERLOO ON N2L 3G1 CANADA
Titolo Testata:
Biogeochemistry
fascicolo: 1, volume: 41, anno: 1998,
pagine: 53 - 69
SICI:
0168-2563(1998)41:1<53:NMIUPS>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
HETEROGENEOUS LANDSCAPE; ALASKAN TUNDRA; ORGANIC-MATTER; AMINO-ACID; SOIL; DECOMPOSITION; TEMPERATURE; LITTER; BIOGEOCHEMISTRY; DENITRIFICATION;
Keywords:
BOREAL FOREST; DISSOLVED ORGANIC NITROGEN; N MINERALIZATION; NITRIFICATION; PRECAMBRIAN SHIELD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
S. Lamontagne, "NITROGEN MINERALIZATION IN UPLAND PRECAMBRIAN SHIELD CATCHMENTS - CONTRASTING THE ROLE OF LICHEN-COVERED BEDROCK AND FORESTED AREAS", Biogeochemistry, 41(1), 1998, pp. 53-69

Abstract

The upland boreal forest at the Experimental Lakes Area (northwesternOntario, Canada) is characterized by treed soil islands interspersed within lichen and moss-covered bedrock outcrops. N mineralization was 2.5-fold and net nitrification was 13-fold higher on an areal basis over bedrock surfaces because of high mineralization rates under lichen and moss patches. The higher average soil temperature in lichen and moss patches could not account for the difference in mineralization rates. Lichens did not provide a significant additional source of N because they did not fix atmospheric N. A refractory conifer litter with a high C:N probably favours the immobilization of N in forest islands. Buried bag and in situ core incubations yielded similar net N mineralization rates but core incubations underestimated net nitrification rates. Both methods did not adequately measure dissolved organic N (DON) production rates because soil disturbance caused high initial DON concentrations. The higher export of mineral N from bedrock surfaces is probably a combination of the lower retention of N in precipitation and leaching of mineralized N from lichen and moss patches.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 14:40:18