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Evaluating Douglas-fir and western hemlock volume growth in response to thinning and fertilisation

Evaluating Douglas-fir and western hemlock volume growth in response to thinning and fertilisation Background: Thinning and fertilisation are two silvicultural tools which can modify the growth of a stand. Thinning re-allocates the resources on a site to increase the growth of the trees remaining after the thinning but does not necessarily increase total stand volume as compared to an unthinned stand. Fertilisation is intended to increase the growth of all trees in a stand resulting in more volume. Understanding the response of fertilisation and thinning treatments is critical to making good silviculture prescriptions. To assist with making these prescriptions, yield models for Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) on coastal sites of British Columbia, Canada were developed. Douglas-fir and western hemlock are the two most important species on these sites. Methods: The data for the modelling came from a large fertilisation and thinning trial (EP703). The model for total volume is based on the Chapman-Richards function. One parameter of the model was expressed as a function of a previous measurement and the other two parameters, which are in turn expressed as a linear function of site index and thinning and/or fertilisation intensity. Results: Independent models were fitted for both species in the study using http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png New Zealand Journal of Forestry Science Springer Journals

Evaluating Douglas-fir and western hemlock volume growth in response to thinning and fertilisation

Nigh, Gord
New Zealand Journal of Forestry Science , Volume 43 (1) – Aug 28, 2013
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References (52)

Publisher
Springer Journals
Copyright
Copyright © 2013 by Nigh; licensee Springer.
Subject
Life Sciences; Forestry
eISSN
1179-5395
DOI
10.1186/1179-5395-43-9
Publisher site
See Article on Publisher Site

Abstract

Background: Thinning and fertilisation are two silvicultural tools which can modify the growth of a stand. Thinning re-allocates the resources on a site to increase the growth of the trees remaining after the thinning but does not necessarily increase total stand volume as compared to an unthinned stand. Fertilisation is intended to increase the growth of all trees in a stand resulting in more volume. Understanding the response of fertilisation and thinning treatments is critical to making good silviculture prescriptions. To assist with making these prescriptions, yield models for Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) on coastal sites of British Columbia, Canada were developed. Douglas-fir and western hemlock are the two most important species on these sites. Methods: The data for the modelling came from a large fertilisation and thinning trial (EP703). The model for total volume is based on the Chapman-Richards function. One parameter of the model was expressed as a function of a previous measurement and the other two parameters, which are in turn expressed as a linear function of site index and thinning and/or fertilisation intensity. Results: Independent models were fitted for both species in the study using

Journal

New Zealand Journal of Forestry Science – Springer Journals

Published: Aug 28, 2013

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