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Titolo:
SHOOT NITRATE REDUCTASE ACTIVITIES OF FIELD-LAYER SPECIES IN DIFFERENT FOREST TYPES .3. A PRELIMINARY SURVEY IN BEECH FORESTS IN SOUTHERN SWEDEN
Autore:
HOGBOM L;
Indirizzi:
SWEDISH UNIV AGR SCI,DEPT FOREST ECOL,SOIL SCI SECT S-90183 UMEA SWEDEN
Titolo Testata:
Scandinavian journal of forest research
fascicolo: 2, volume: 9, anno: 1994,
pagine: 124 - 128
SICI:
0282-7581(1994)9:2<124:SNRAOF>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROGEN DEPOSITION; SOIL ACIDIFICATION; VEGETATION; HEATHLAND; PLANTS; ACID;
Keywords:
BEECH FORESTS; FIELD-LAYER PLANTS; LIGHT REGIME; N-DEPOSITION; NITRATE; NITRATE REDUCTASE ACTIVITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
L. Hogbom, "SHOOT NITRATE REDUCTASE ACTIVITIES OF FIELD-LAYER SPECIES IN DIFFERENT FOREST TYPES .3. A PRELIMINARY SURVEY IN BEECH FORESTS IN SOUTHERN SWEDEN", Scandinavian journal of forest research, 9(2), 1994, pp. 124-128

Abstract

Deposition of protons, nitrate and sulphate have caused a decrease insoil pH and base saturation in southern Scandinavia. Floral changes have been suggested to be due to this deposition. This study was made to test if differences in nitrate assimilation capability between plants could be one of the reasons behind reported changes in the flora. Current and maximally induced nitrate reductase activity (C-NRA and MI-NRA, respectively) were measured in four beech forest field-layer species, which have been reported to behave differently with respect to acid rain. The study was conducted at four sites of different soil quality (pH). There were considerable differences between the species as regards both C-NRA and MI-NRA. For two of the studied species, Galium odoratum and Stellaria nemorum, the gap between C- and MI-NRA was relatively small but for Mercurialis perennis and Oxalis acetosella, this gapwas larger. A small difference between C- and MI-NRA should indicate that a larger portion of the available resources for nitrate reductionis already used. The concentrations of soluble carbohydrates were correlated with the MI-NRA after leafing of beech, while before leafing no such effect could be detected. It can be concluded that the light environment has a considerable effect on the nitrate nutrition of field-layer plants. Apparently, some species receive as much nitrate as theycan reduce. Fertiliser experiments are needed to test if higher addition rates are harmful to them.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 12:26:30