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Cabrera, O.; Fries, A.; Hildebrandt, P.; G&uuml;nter, S. &amp; Mosandl, R. (2019): <b>Early Growth Response of Nine Timber Species to Release in a Tropical Mountain Forest of Southern Ecuador</b>. <i>Forests</i> <b>10</b>(3), 254.

Resource Description

Title: Early Growth Response of Nine Timber Species to Release in a Tropical Mountain Forest of Southern Ecuador
FOR816dw ID: 1840
Publication Date: 2019-03-13
License and Usage Rights:
Resource Owner(s):
Individual: Omar Cabrera
Contact:
Individual: Andreas Fries
Contact:
Individual: Patrick Hildebrandt
Contact:
Individual: Sven Günter
Contact:
Individual: Reinhard Mosandl
Contact:
Abstract:
Abstract: Research Highlights: This study determined that treatment “release from competitors”<br/> causes different reactions in selected timber species respective to diametrical growth, in which the<br/> initial size of the tree (diametric class) is important. Also, the growth habit and phenological traits<br/> (defoliation) of the species must be considered, which may have an influence on growth after release.<br/> Background and Objectives: The objective of the study was to analyze the diametric growth of nine<br/> timber species after their release to answer the following questions: (i) Can the diametric growth of the<br/> selected timber species be increased by release? (ii) Does the release cause different responses among<br/> the tree species? (iii) Are other factors important, such as the initial diameter at breast height (DBH)<br/> or the general climate conditions? Materials and Methods: Four-hundred and eighty-eight trees<br/> belonging to nine timber species were selected and monitored over a three-year period. Release was<br/> applied to 197 trees, whereas 251 trees served as control trees to evaluate the response of diametrical<br/> growth. To determine the response of the trees, a linear mixed model (GLMM, R package: LMER4)<br/> was used, which was adjusted by a one-way ANOVA test. Results: All species showed a similar<br/> annual cycle respective to diametric increases, which is due to the per-humid climate in the area.<br/> Precipitation is secondary for the diametric growth because sufficient rainfall occurs throughout year.<br/> What is more important, however, are variations in temperature. However, the species responded<br/> differently to release. This is because the initial DBH and growth habit are more important factors.<br/> Therefore, the species could be classified into three specific groups: Positive, negative and no response<br/> to release. Conclusions: Species which prefer open sites responded positively to release, while shade<br/> tolerant species and species with pronounced phenological traits responded negatively. The initial<br/> DBH was also an important factor for diametric increases. This is because trees of class I (20 cm<br/> to 30 cm DBH) responded positively to the treatment, whereas for bigger or older individuals,<br/> the differences decreased or became negative.
Keywords:
| tree growth | radial growth change | tree competition | silvicultural interventions |
Literature type specific fields:
ARTICLE
Journal: Forests
Volume: 10
Issue: 3
Page Range: 254
Publisher: MDPI
Publication Place: Basel
ISSN: 1999-4907
Metadata Provider:
Individual: Bernd Stimm
Contact:
Online Distribution:
Download File: http://www.lcrs.de/publications.do?citid=1840


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