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Aspects of regeneration in tropical secondary forests of Northeast Borneo affected by selective logging, El Niño-induced drought and fire

Romell, Eva (2011). Aspects of regeneration in tropical secondary forests of Northeast Borneo affected by selective logging, El Niño-induced drought and fire. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2011:57
ISBN 978-91-576-7601-6
[Doctoral thesis]

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A large proportion of the world´s tropical rainforests are today secondary forests, a term encompassing forests in various degrees of degeneration. For the main traits of old-growth forests´ structures, species composition and ecosystem functions to recover, regeneration of non-pioneer tree species is essential. In the studies this thesis is based upon I addressed various aspects of regeneration, both natural and artificial, mainly in secondary forests of northeast Borneo subjected to selective logging in the early 1980´s followed by prolonged El Niño-induced drought and forest fires in 1982-83.
The field studies underlying this thesis included one survey of natural regeneration in transects and two experiments with artificial regeneration; gap creation with under-planting nursery raised tree seedlings and direct seeding. Forest floor light conditions in created gaps were measured as photosynthetic photon flux density and proportion canopy openness. Methods applied to analyze data were ordinations (NMS and MRPP), ANCOVA and general linear model ANOVA.
Based upon these results some general conclusions and implications for forest management are addressed for secondary forests with this type of disturbance history: Forest patches with remnant potential seed trees and a more intact canopy structure had more diversified tree species recruits and are therefore less demanding of artificial regeneration. In artificial gap creation a sub-canopy reduction would be the preferable method compared to girdling or felling pioneer canopy trees since the positive effect of sub-canopy treatments is longer lasting. Under-planted dipterocarp seedlings increase height growth in high-light environments while their survival appeared unaffected by light conditions, therefore a medium shade reduction would be preferable as this leads to only moderate release of competing vegetation. Direct seeding must be evaluated further before large scale application, especially the timing and species choice merits special attention.

Authors/Creators:Romell, Eva
Title:Aspects of regeneration in tropical secondary forests of Northeast Borneo affected by selective logging, El Niño-induced drought and fire
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :5 May 2011
Number of Pages:56
IRomell, E., Hofgaard, A., Wilmann, B., Ilstedt, U. Tree seedling recruitment in lowland mixed dipterocarp forests after El Niño-induced drought, fire and selective logging. Manuscript.
IIRomell, E., Hallsby, G., Karlsson, A. (2009). Forest floor light conditions in a secondary tropical rain forest after artificial gap creation in northern Borneo. Agricultural and Forest Meteorology 149: 929-937.
IIIRomell, E., Hallsby, G., Karlsson, A., Garcia, C. (2008). Artificial canopy gaps in a Macaranga spp. dominated secondary tropical rain forest – effects on survival and above ground increment of four under-planted dipterocarp species. Forest Ecology and Management 255: 1452-1460.
IVRomell, E. Direct seeding results can be severely affected by predation: A case study of three Shorea species and Intsia palembanica in a Macaranga-dominated secondary forest. Manuscript.
Place of Publication:Umeå
Publisher:Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-576-7601-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Agrovoc terms:regeneration, tropical rain forests, secondary forests, selective felling, logging, borneo
Keywords:artificial gaps, canopy, direct seeding, forest floor light, lowland mixed dipterocarp forests, Macaranga spp., Shorea spp., sub-canopy, tree species recruitment, under-planting
Permanent URL:
ID Code:8126
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: Eva Romell
Deposited On:11 May 2011 07:07
Metadata Last Modified:01 Jun 2015 09:12

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