NDLI: Changes of Volume Increment of Scots pine (Pinus silvestris) Trees in the Dependence on Defoliation

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Changes of Volume Increment of Scots pine (Pinus silvestris) Trees in the Dependence on Defoliation

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Forestry and Forest Industry Sector in the Federal Republic of Germany According to the New European-Wide Sector Definition

Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 122, Issue 1, February 2003

Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 121

Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 120

Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 119

Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 118

Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 117

Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 116

Changes of Volume Increment of Scots pine (Pinus silvestris) Trees in the Dependence on Defoliation

Content Provider	Springer Nature Link
Author	Petráš, Rudolf Mecko, Julián
Copyright Year	2003
Abstract	Der Beitrag befaßt sich mit methodischen Aspekten der Quantifizierung der Volumenzuwachsänderung von Einzelbäumen und zeigt die Ergebnisse von Untersuchungen von Volumenzuwachsänderungen der Kiefer in der Slowakei in Bezug zum Nadelverlust. Die Volumenzuwächse der Einzelbäume wurden mittels Gleichungen des totalen Differentials das als Produkt der partiellen Ableitung der Volumengleichungen von Bäumen gemäß den Eingangsparametern und deren Differential berechnet wird, abgeleitet. Dabei wurden zwei Varianten überprüft. Bei der ersten Variante wurden als Eingangsparameter Brusthöhendurchmesser (BHD) und Höhe verwendet. Bei der zweiten Variante werden mehrere Durchmesser in verschiedenen Schafthöhen verwendet. Die BHD-, Höhen- und Durchmesserzuwächse in drei relativen Höhen am Stamm (30%; 50% und 70% der Höhe) wurden durch relative Zuwachindizes in Abhängigkeit von Nadelverlust beschrieben. Empirisches Material wurde von 31 Kieferbeständen der Slowakei gesammelt. Insgesamt handelt es sich um 1045 Radialzuwächse in BHD, 2000 Radialzuwächse in drei Relativhöhen auf dem Stamm und 519 Höhenzuwächse. Die Ergebnisse zeigen, daß der Index des Volumenzuwachses, der mittels des ersten Verfahrens (die Methode des totalen Differentials aus der 2-Argument-Gleichung) berechnet wurde, bis 50% des Nadelverlusts um 5% niedriger, bzw. über 50% des Nadelverlust höher als BHD-Zuwachsindex ist. Noch deutlichere Unterschiede zwischen den Zuwachsindizes sind erkennbar, wenn die Durchmesserzuwachsindizes aus verschiedenen Höhen am Stamm und der Volumenzuwachsindex, der mit der zweiten Methode abgeleitet ist, verglichen werden. So liegt der BHD-Zuwachsindex um 10–15% niedriger, als der Volumenzuwachsindex. Das bedeutet, daß die Volumenzuwachverluste immer dann überschätzt werden, wenn nur die Durchmesserzuwachsverluste quantifiziert und diese dann verallgemeinert werden. Diese Erkenntnis ist für die Quantifizierung der Zuwachsänderung nicht nur von theoretischer, sondern auch von praktischer Bedeutung.The paper deals with the methodical aspects of the quantification of the changes in the volume increment of trees and presents the results of the research on the changes of pine volume increments in Slovakia in relation to tree defoliation. The changes of volume increment of individual trees were derived by means of the equations of total differential as a product of partial derivations of the volume equations of trees. Two variants were tested. In the first variant breast diameter and height of tree was used. In the second variant there were used several diameters at different heights on the stem. Breast diameter increments, height increments and diameter increments at three relative heights on the stem (30%, 50%, 70% of the height) were determined relatively by means of increment indexes in the dependence on tree defoliation. Empirical material was collected in 31 pine stands in Slovakia. It consists of 1045 radial increments on the stem at breast height, 2000 radial increments at three relative heights on the stem and 519 increments of tree height. The results show that the indexes of tree volume increment that were derived using the first method (method of total differential from double-argument volume equations) are with the defoliation within 50% lower by 5% and with the defoliation above 50% they are higher by 5% than the indexes of diameter increment at breast height. More marked differences between increment indexes are apparent when we compare the indexes of diameter increments at different heights on the stem and the index of volume increment derived using the second method. Here, the index of diameter increment at breast height has lower values by 10–15% than the index of volume increment. Thus the reduction of volume increment is lower by 10–15% than the reduction of diameter increment at pine trees breast heights. This finding has in the quantification of increment reduction not only theoretical but also practical significance.
Starting Page	115
Ending Page	126
Page Count	12
File Format	PDF
ISSN	00158003
Journal	Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch
Volume Number	122
Issue Number	2
e-ISSN	14390337
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Scots pine volume increment increment reduction total differential.
Content Type	Text
Resource Type	Article
Subject	Plant Science Forestry

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