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Aspects of hybrid larch (Larix X eurolepis Henry) as a potential tree species in southern Swedish forestry

Larsson-Stern, Marie (2003). Aspects of hybrid larch (Larix X eurolepis Henry) as a potential tree species in southern Swedish forestry. Alnarp : Sveriges lantbruksuniv.
ISBN 91-576-6296-7
[Licentiate thesis]

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Abstract

The interest in growing hybrid larch (Larix × eurolepis Henry) in southern Sweden has increased in recent decades, one of its assumed advantages being high volume growth. The work underlying this thesis was designed to contribute to our understanding of hybrid larch and its use in commercial forestry as a complement to Norway spruce (Picea abies (L.) Karst.) in southern Sweden. A literature review supported the hypotheses that young hybrid larch stands have high growth and yield potential. In addition, it highlighted the difficulties involved in morphologically distinguishing the hybrid from its parental species and stressed the susceptibility of hybrid larch to root rot (mainly caused by Heterobasidion annosum (Fr.) Bref.). A survey conducted through interviews in 1993 of the opinions of forest managers with practical experience of growing hybrid larch showed that the species was considered to offer an interesting complement to other conifer tree species in southern Sweden. In addition, a growth simulator was developed, based on data from 28 sample plots established in stands on fertile sites managed with practical forestry programs. It included regression functions for basal area increment, stand form-height and initial basal area. Top height growth curves from a Norwegian study were also included in the simulator. A yield table was calculated for the age span 15 to 45 years. The calculations showed that the yield of hybrid larch stands on fertile sites in southern Sweden was slightly higher compared to Norway spruce, and its growth rate was markedly higher in young stands. On fertile sites the mean annual volume increment peaked at an age of 35 years, at a level of 13 m³/ha. However, the bark volume, as a proportion of total volume, was ca. 5% lower for Norway spruce than for hybrid larch. Economic calculations using current prices and costs (year 2002) showed that cash flow for hybrid larch was slightly higher and the soil expectation value was more than double the corresponding values for Norway spruce. Hybrid larch stands can be damaged by root and butt rot, but there was no clear evidence that the species was markedly worse than Norway spruce in this respect. The general opinion was that well managed older larch stands were less susceptible to wind throw than old Norway spruce stands. A general conclusion was that hybrid larch could be an attractive complement to Norway spruce on relatively rich sites in southern Sweden.

Authors/Creators:Larsson-Stern, Marie
Title:Aspects of hybrid larch (Larix X eurolepis Henry) as a potential tree species in southern Swedish forestry
Year of publishing :January 2003
Number of Pages:92
Papers/manuscripts:
NumberReferences
ALLI. Larsson-Stern, M. 2003. Larch in Commercial Forestry: A literature Review to Help Clarify the Potential of Hybrid Larch (Larix X eurolepis Henry) in Southern Sweden (publ. only in thesis). II. Larsson-Stern, M. 1999. Hybridlärk - ett lämpligt trädslag för Sydsverige? Skog & Forskning, No 3. ISSN 1101-9506. (In Swedish.) III. Larsson-Stern, M., Ekö, P.M., Albrektson, A. 2003. Growth and Yield of Hybrid Larch (Larix X eurolepis Henry) in Southern Sweden. (Submitted.)
Place of Publication:Alnarp
ISBN for printed version:91-576-6296-7
Language:English
Publication Type:Licentiate thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F62 Plant physiology - Growth and development
Subjects:Not in use, please see Agris categories
Agrovoc terms:heterobasidion annosum, growth, hybrids, larix eurolepis, root rots, volume, yields, sweden
Keywords:Butt rot, growth simulator, Heterobasidion annosum, hybrid larch, larch species identification, Larix × eurolepis, root rot, volume growth, yield.
URN:NBN:urn:nbn:se:slu:epsilon-266
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-266
ID Code:441
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: Marie Larsson-Stern
Deposited On:12 Jan 2004 00:00
Metadata Last Modified:02 Dec 2014 10:04

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