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Vegetation structure and potential gross primary productivity of mangroves at Kadolkele in Meegamuwa (Negombo) estuary, Sri Lanka

Authors:

JMAL Jayakody ,

Department of Botany, Universityof Kelaniya, Kelaniya, LK
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MD Amarasinghe,

Department of Botany, Universityof Kelaniya, Kelaniya, LK
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V Pahalawattaarachchi,

National Aquatic Resources Research and Development Agency, Negombo, LK
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KHWL De Silva

Department of Botany, Universityof Kelaniya, Kelaniya, LK
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Abstract

The potential gross primary productivity of the mangrove stands at Kadolkele in Meegamuwa (Negombo) estuary was studied in relation to vegetation structure with a view to understanding the salient structural components that affect functioning of mangrove ecosystems. Structure of mangrove stands under study was characterized with plant species richness, plant (stem) density, frequency of occurrence of constituent species, plant basal area and height. The structural complexity index values calculated from above parameters revealed a statistically significant (p < 0.01) positive relationship with the potential gross primary productivity of the mangrove stands that has been calculated using data on absorption of photosynthetically active radiation (PAR) by the stands that were measured using a light meter with a quantum sensor. Leaf area index (LAI) values were calculated using absorption data and potential gross primary productivity was estimated using an assimilation coefficient. Mean values of structural parameters were used to ordinate the mangrove sites through principal component analysis. Ordination showed a productivity gradient among the mangrove sites where species richness, stem density, plant height and leaf area index were the key factors that affect potential gross primary productivity of mangrove stands.

DOI: 10.4038/sljas.v13i0.2209

Sri Lanka J. Aquat. Sci. 13 (2008): 95-108
Keywords: Meegamuwa Mangroves 
How to Cite: Jayakody, J. et al., (2010). Vegetation structure and potential gross primary productivity of mangroves at Kadolkele in Meegamuwa (Negombo) estuary, Sri Lanka. Sri Lanka Journal of Aquatic Sciences. 13, pp.95–108. DOI: http://doi.org/10.4038/sljas.v13i0.2209
Published on 13 Aug 2010.
Peer Reviewed

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