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Tree canopy transpiration at different sites of a spruce forest ecosystem

Titelangaben

Köstner, Barbara ; Alsheimer, Martina ; Tenhunen, John:
Tree canopy transpiration at different sites of a spruce forest ecosystem.
In: Verhandlungen der Gesellschaft für Ökologie. Bd. 26 (1996) . - S. 61-68.
ISSN 0171-1113

Abstract

Within the framework of a forest catchment study, six Picea abies stands differing in age, structure, exposition, and soil conditions were selected to examine forest canopy transpiration (Ec) and total canopy conductance (gt). Under non-limiting soil water conditions, maximum daily rates of Ec measured by xylem sap flow were lowest at the oldest, 140-year-old site (2.0 mm d-1) and highest at a boggy, unmanaged 40-year-old site (3.0 mm d-1). Sap flux density was highest at the old site (0.04-0.15 kg cm-2 sapwood area d-1) and the boggy site (0.07-0.13 kg cm-2 sapwood area d-1). Differences in Ec between sites were associated with a decreasing ratio of needle area to sapwood cross-sectional area, with decreasing stand age, and increasing stand density. Greatest transpirational water loss occurred on days with maximum vapor pressure deficit (Dmax) of 20 hPa. On sunny days maximum canopy conductance (gtmax) was associated with Dmax of 10 hPa and decreased strongly with further increases in Dmax. In preliminary analyses, differences in Ec between sites were best explained by variation in stand density rather than in stand age or leaf area index (LAI).

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Nein
Zusätzliche Informationen: BAYCEER6947
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Pflanzenökologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 24 Sep 2015 09:39
Letzte Änderung: 24 Sep 2015 09:39
URI: https://eref.uni-bayreuth.de/id/eprint/19750