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DOI	10.1016/j.foreco.2019.117726
	Effects of silvicultural treatments and topography on individual tree growth in a tropical mountain forest in Ecuador
	Kübler D.; Hildebrandt P.; Günter S.; Stimm B.; Weber M.; Muñoz J.; Cabrera O.; Zeilinger J.; Silva B.; Mosandl R.
发表日期	2020
ISSN	0378-1127
卷号	457
英文摘要	Few studies have analysed the effect of silvicultural treatments on tree growth in tropical montane forests (TMF). These forests have strong topographic gradients, which influence growth rates and can potentially interact with silvicultural treatments. The present study investigated the relative effects of silvicultural treatments and topography on growth rates at the tree level in a TMF. For this, we combined two distinct data sources: (1) field data from a silvicultural experiment in the Andes of southern Ecuador where liberation thinnings, i.e. the removal of the strongest crown competitors, were applied to potential crop trees (PCT) in 2004; and (2) topographic variables obtained from a high-resolution digital terrain model created from an airborne LIDAR survey. We fitted all data in a single linear mixed-effect model. Based on monitoring data from 174 released and 200 reference PCTs of 8 timber species, we calculated periodic annual increment (PAI) in DBH 6 years after the silvicultural treatment as our outcome variable. As topographic predictors, we used elevation and a topographic position index. To control for the by-species growth variability we included random intercepts for species and random slopes for the effect of treatment on species in our model. PAI was significantly influenced by the topographic predictors. Over the elevational gradient, growth rates declined on average by 0.73 mm a−1 per 100 m increase in elevation. For the topographic position, PCTs in valleys had an average PAI of 2.02 mm a−1 compared to 1.04 mm a−1 on ridges. The effect of the silvicultural treatment across all species was only marginally significant, but its effect size was nevertheless within the range, but at the lower end of values reported for other tropical forest ecosystems (reference trees: 1.35 mm a−1; released trees: 1.60 mm a−1). Between species, baseline growth rates as well as the treatment effect varied considerably. Best linear unbiased predictions of species effects suggested that 5 species responded positively to the silvicultural treatment, whereas 3 species showed no treatment effect. Overall, tree growth varied substantially as indicated by the large residual variance that remained unaccounted for in the model. Our findings indicate that positive effects of silvicultural treatments in TMF are likely to exist, but that they are possibly obfuscated by strong topographical gradients and large between-tree growth variability. Overall, our results suggest that “broad-brush” management prescriptions are not suited for sustainable forest management of TMF. Instead, granular and spatially explicit prescriptions that take the strong impact of topography on diameter growth as well as species-specific responses to silvicultural treatments into account should be favoured. © 2019 Elsevier B.V.
英文关键词	Cedrela montana; Diameter growth; Ecuador; Handroanthus chrysanthus; Silvicultural treatments; Sustainable forest management; Tropical montane forest
语种	英语
scopus关键词	Ecosystems; Landforms; Topography; Tropics; Diameter growth; Ecuador; Handroanthus chrysanthus; Montana; Silvicultural treatments; Sustainable forest management; Tropical montane forest; Forestry; digital terrain model; forest ecosystem; forest management; growth; growth rate; lidar; montane forest; silviculture; sustainable forestry; topography; tree; tropical forest; Ecosystems; Ecuador; Montana; Sustainable Forest Management; Topography; Tropics; Andes; Ecuador; Cedrela
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155599
作者单位	Institute of Silviculture, TU München, Hans-Carl-von-Carlowitz-Platz 2, Freising, 85354, Germany; Institute for World Forestry, University of Hamburg, Leuschnerstr. 91, Hamburg, 21031, Germany; Thünen Institute of International Forestry and Forest Economics, Leuschnerstr. 91, Hamburg, 21031, Germany; Carrera de Ingenieria Forestal, Universidad Nacional de Loja, Ciudadela Universitaria, Loja, Ecuador; Department of Biological Sciences, Universidad Técnica Particular de Loja, San Cayetano Alto s/n, Loja, Ecuador; Faculty of Geography, Philipps University of Marburg, Deutschhausstraße 12, Marburg, 35032, Germany
推荐引用方式 GB/T 7714	Kübler D.,Hildebrandt P.,Günter S.,et al. Effects of silvicultural treatments and topography on individual tree growth in a tropical mountain forest in Ecuador[J],2020,457.
APA	Kübler D..,Hildebrandt P..,Günter S..,Stimm B..,Weber M..,...&Mosandl R..(2020).Effects of silvicultural treatments and topography on individual tree growth in a tropical mountain forest in Ecuador.Forest Ecology and Management,457.
MLA	Kübler D.,et al."Effects of silvicultural treatments and topography on individual tree growth in a tropical mountain forest in Ecuador".Forest Ecology and Management 457(2020).