NDLI: Preliminary evaluation of an individual tree growth model for Norway spruce stands

Content Provider	Springer Nature Link
Author	Sterba, Hubert Korol, Nikolaj Rössler, Günter
Copyright Year	2001
Abstract	Die Brauchbarkeit des abstandsunabhängigen Einzelbaumsimulators PrognAus wird anhand dreier Fichten-Versuche untersucht; einer Zielstärkennutzungs-Beobachtungsfläche aus dem Böhmerwald, einem bayerischen Durchforstungsversuch und einer österreichischen Versuchsanlage des Europäischen Stammzahlhaltungsversuches. Die Durchmesser und die Höhen der einzelnen Bäume nach 20 Jahren werden gut prognostiziert. Die Prognose der baumindividuellen Kreisflächenzuwächse ist besser, als dies aus den Restfehlern und den Bestimmtheitsmaßen der verwendeten Wachstumsgleichungen zu erwarten war. Stärkere Abweichungen im Mittel der Höhenzuwächse im Europäischen Stammzahlhaltungsversuche werden auf dessen extrem hohe Bonität (dGz100>22 Vfm/Jahr/ha) zurückgeführt. Eine nur mäßige, aber signifikante Unterschätzung großer, und Überschätzung kleiner Zuwächse wird aus der Tatsache erklärt, daß in anderen Untersuchungen gezeigt werden konnte, daß die Koeffizienten des Kreisflächenzuwachsmodells in Abhängigkeit vom Fichtenanteil variieren. Dies ist im validierten Simulator PrognAus noch nicht berücksichtigt und muß daher bei seiner ausschließlichen Anwendung auf Fichtenreinbestände zu — wenn auch nicht sehr großen — Abweichungen von den Beobachtungen führen. Die flächenbezogenen Behandlungseffekte werden vom Modell qualitativ in der richtigen Reihenfolge wiedergegeben, allerdings geringfügig überzeichnet.The applicability of the distance independent individual tree growth simulator PrognAus is tested in three Norway spruce experiments in a long term observation plot with target diameter thinning, a thinning experiment in Bavaria with 6 plots, and an Austrian experiment within the European Norway Spruce Thinning Experiment. Individual tree breast height diameters and heights after 20 years are generally sufficiently well-forecasted. The simulated basal area increments deviate from the observed values less than is to be expected from the statistics found in the parameterization procedure. The considerable underestimation of the height increment in the European Norway Spruce Thinning Experiment results from its extremely high site class (m.a.i. at age 100>22 m3ha−1a−1), which most probably was not represented in the parameterization data set. A small effect of underestimation of small basal area increments and overestimation of large increments is in line with other findings, indicating that the effects of dbh and competition are smaller in pure Norway spruce stands and larger in mixed species stands. The treatment effects are depicted in the correct order by the model, but nevertheless the simulated thinning effects are generally slightly overestimated.
Starting Page	406
Ending Page	421
Page Count	16
File Format	PDF
ISSN	00158003
Journal	Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch
Volume Number	120
Issue Number	1-6
e-ISSN	14390337
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Individual tree growth model validation Picea abies Forestry Plant Sciences Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Forestry

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