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Forests 2019, 10(3), 254; https://doi.org/10.3390/f10030254

Early Growth Response of Nine Timber Species to Release in a Tropical Mountain Forest of Southern Ecuador

1
Institute of Silviculture, Center of Life and Food Sciences Weihenstephan, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany
2
Department of Biological Sciences, Universidad Técnica Particular de Loja, San Cayetano Alto s/n, 1101608 Loja, Ecuador
3
Department of Geology and Mine and Civil Engineering (DGMIC), Universidad Técnica Particular de Loja, San Cayetano Alto s/n, 1101608 Loja, Ecuador
4
Institut für Internationale Waldwirtschaft und Forstökonomie, Leuschnerstraße 91, 21031 Hamburg-Bergedorf, Germany
*
Author to whom correspondence should be addressed.
Received: 16 January 2019 / Revised: 26 February 2019 / Accepted: 6 March 2019 / Published: 13 March 2019
(This article belongs to the Section Forest Ecology and Management)
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Abstract

Research Highlights: This study determined that treatment “release from competitors” causes different reactions in selected timber species respective to diametrical growth, in which the initial size of the tree (diametric class) is important. Also, the growth habit and phenological traits (defoliation) of the species must be considered, which may have an influence on growth after release. Background and Objectives: The objective of the study was to analyze the diametric growth of nine timber species after their release to answer the following questions: (i) Can the diametric growth of the selected timber species be increased by release? (ii) Does the release cause different responses among the tree species? (iii) Are other factors important, such as the initial diameter at breast height (DBH) or the general climate conditions? Materials and Methods: Four-hundred and eighty-eight trees belonging to nine timber species were selected and monitored over a three-year period. Release was applied to 197 trees, whereas 251 trees served as control trees to evaluate the response of diametrical growth. To determine the response of the trees, a linear mixed model (GLMM, R package: LMER4) was used, which was adjusted by a one-way ANOVA test. Results: All species showed a similar annual cycle respective to diametric increases, which is due to the per-humid climate in the area. Precipitation is secondary for the diametric growth because sufficient rainfall occurs throughout year. What is more important, however, are variations in temperature. However, the species responded differently to release. This is because the initial DBH and growth habit are more important factors. Therefore, the species could be classified into three specific groups: Positive, negative and no response to release. Conclusions: Species which prefer open sites responded positively to release, while shade tolerant species and species with pronounced phenological traits responded negatively. The initial DBH was also an important factor for diametric increases. This is because trees of class I (20 cm to 30 cm DBH) responded positively to the treatment, whereas for bigger or older individuals, the differences decreased or became negative. View Full-Text
Keywords: climate conditions; diametric growths; growth habit; initial DBH; tree competition climate conditions; diametric growths; growth habit; initial DBH; tree competition
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cabrera, O.; Fries, A.; Hildebrandt, P.; Günter, S.; Mosandl, R. Early Growth Response of Nine Timber Species to Release in a Tropical Mountain Forest of Southern Ecuador. Forests 2019, 10, 254.

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