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Species diversity, regeneration and early growth of Sal forests in Nepal

responses to inherent disturbance regimes

Sapkota, Indra (2009). Species diversity, regeneration and early growth of Sal forests in Nepal. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2009:91
ISBN 978-91-576-7438-8
[Doctoral thesis]

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Abstract

Forest disturbance has been the subject of intense research for many years, but the synergistic effects of various disturbance factors on the forest vegetation are not well documented, particularly in Sal forests. In this thesis, the nexus between a bundle of inherent disturbances of varying intensities and the diversity and/or regeneration of Nepalese Sal forests was examined. In addition, the effects of a single disturbance factor – tree fall gaps – on species diversity, regeneration and early growth of Sal forest were assessed. The intensity of the combined inherent disturbances in each of the studied forest was calculated, and was found to have differing effects on various aspects of the forest vegetation. The total stem density of saplings and poles increased with increasing disturbance intensity, to a certain level, while most of the tree species in the community showed changing dispersion patterns along the disturbance gradient. Socially preferred tree species displayed high regeneration performance in forests subjected to moderate level of disturbance. Tree fall gaps favored regeneration by increasing the density of seedlings of some socially preferred tree species (including Sal) and promoted the maintenance of high species diversity. However, neither overall species diversity nor regeneration positively correlated with gap size, suggesting that the maintenance of species diversity and regeneration in gaps are related more strongly to several other attributes of gaps than gap size. Generally, forests subjected to moderate level of disturbance maintained species diversity and enhanced regeneration performance, which in turn was coupled with the regeneration strategy of dominant tree species – in line with the Intermediate Disturbance and Recruitment Limitation Hypotheses. In conclusion, the findings signify that moderate level of disturbance may be touted as a management tool for Sal forests.

Authors/Creators:Sapkota, Indra
Title:Species diversity, regeneration and early growth of Sal forests in Nepal
Subtitle:responses to inherent disturbance regimes
Year of publishing :2009
Volume:2009:91
Number of Pages:71
Papers/manuscripts:
NumberReferences
ALLI Indra Prasad Sapkota, Mulualem Tigabu, Per Christer Odén (2009). Spatial distribution, advanced regeneration and stand structure of Nepalese Sal (Shorea robusta) forests subject to disturbances of different intensities. Forest Ecology and Management 257(9), 1966-1975. II Indra Prasad Sapkota, Mulualem Tigabu, Per Christer Odén (2010). Changes in tree species diversity and dominance across a disturbance gradient in Nepalese Sal (Shorea robusta Gaertn. f.) forests. Journal of Forestry Research 21(1) (in press). III Indra Prasad Sapkota, Mulualem Tigabu, Per Christer Odén (2009). Species diversity and regeneration of old-growth seasonally dry Shorea robusta forests following gap formation. Journal of Forestry Research 20(1), 7-14. IV Indra Prasad Sapkota, Per Christer Odén (2009). Gap characteristics and their effects on regeneration, dominance and early growth of woody species. Journal of Plant Ecology 2(1), 21-29.
Place of Publication:Alnarp
ISBN for printed version:978-91-576-7438-8
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:shorea robusta, forest ecology, biodiversity, regeneration, canopy, nepal
Keywords:Canopy gaps, Forest disturbance, Intermediate disturbance hypothesis, Multiple disturbances, Recruitment limitation hypothesis, Shorea robusta
URN:NBN:urn:nbn:se:slu:epsilon-3015
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-3015
ID Code:2165
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: Indra Sapkota
Deposited On:17 Nov 2009 00:00
Metadata Last Modified:02 Dec 2014 10:16

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