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Landscape-scale Changes in Forest Canopy Structure Across a Partially Logged Tropical Peat Swamp : Volume 12, Issue 13 (14/07/2015)

By Wedeux, B. M. M.

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Book Id: WPLBN0003989752
Format Type: PDF Article :
File Size: Pages 34
Reproduction Date: 2015

Title: Landscape-scale Changes in Forest Canopy Structure Across a Partially Logged Tropical Peat Swamp : Volume 12, Issue 13 (14/07/2015)  
Author: Wedeux, B. M. M.
Volume: Vol. 12, Issue 13
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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M. Wedeu, B. M., & Coomes, D. A. (2015). Landscape-scale Changes in Forest Canopy Structure Across a Partially Logged Tropical Peat Swamp : Volume 12, Issue 13 (14/07/2015). Retrieved from

Description: Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK. Forest canopy structure is strongly influenced by environmental factors and disturbance, and in turn influences key ecosystem processes including productivity, evapotranspiration and habitat availability. In tropical forests increasingly modified by human activities, the interplaying effects of environmental factors and disturbance legacies on forest canopy structure across landscapes are practically unexplored. We used high-fidelity airborne laser scanning (ALS) data to measure the canopy of old-growth and selectively logged peat swamp forest across a peat dome in Central Kalimantan, Indonesia, and quantified how canopy structure metrics varied with peat depth and under logging. Several million canopy gaps in different height cross-sections of the canopy were measured in 100 plots of 1 km2 spanning the peat dome, allowing us to describe canopy structure with seven metrics. Old-growth forest became shorter and had simpler vertical canopy profiles on deeper peat, consistently with previous work linking deep peat to stunted tree growth. Gap Size Frequency Distributions (GSFDs) indicated fewer and smaller canopy gaps on the deeper peat (i.e. the scaling exponent of pareto functions increased from 1.76 to 3.76 with peat depth). Areas subjected to concessionary logging until 2000, and informal logging since then, had the same canopy top height as old-growth forest, indicating the persistence of some large trees, but mean canopy height was significantly reduced; the total area of canopy gaps increased and the GSFD scaling exponent was reduced. Logging effects were most evident on the deepest peat, where nutrient depletion and waterlogged conditions restrain tree growth and recovery. A tight relationship exists between canopy structure and the peat deph gradient within the old-growth tropical peat swamp. This relationship breaks down after selective logging, with canopy structural recovery being modulated by environmental conditions.

Landscape-scale changes in forest canopy structure across a partially logged tropical peat swamp

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