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Dynamic coupling of allometric ratios to a process-based forest growth model for estimating the impacts of stand density changes

Grote, Rüdiger; Kraus, David; Weis, Wendelin; Ettl, Rasmus; Göttlein, Axel

Process-based models are increasingly applied for simulating long-term forest developments in order to capture climate change impacts and to investigate suitable management responses. Regarding dimensional development, however, allometric relations such as the height/diameter ratio, branch and coarse root fractions or the dependency of crown dimension on stem diameter often do not account for environmental influences. While this may be appropriate for even-aged, monospecific forests, serious biases can be expected if stand density or forest structure changes rapidly. Such events occur in particular when forests experience disturbances such as intensive thinning or during early development stages of planted or naturally regenerated trees. We therefore suggest a calculation of allometric relationships that depends primarily on neighbourhood competition. Respective equations have been implemented into a physiology-based ecosystem model that considers asymmetric competition by explicit simulation of resource acquisition and depletion per canopy layer. The new implementation has been tested at two sites in Germany where beech (Fagus sylvatica) saplings have either been planted below a shelterwood of old spruces (Picea abies) or grown under clear-cut conditions. ... mehr

DOI: 10.1093/forestry/cpaa002
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 07.10.2020
Sprache Englisch
Identifikator ISSN: 0015-752X, 1464-3626
KITopen-ID: 1000124376
HGF-Programm 12.02.02 (POF III, LK 01)
Vegetation climate- and land use system
Erschienen in Forestry
Band 93
Heft 5
Seiten 601–615
Vorab online veröffentlicht am 07.02.2020
Schlagwörter forest development; ecosystem model; LandscapeDNDC; model development; model evaluation; understorey; forest regeneration; allometric relations
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