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Net primary productivity of two mangrove forest stands on the northwestern coast of Sri Lanka
Amarasinghe, M.D.; Balasubramaniam, S. (1992). Net primary productivity of two mangrove forest stands on the northwestern coast of Sri Lanka. Hydrobiologia 247: 37-47
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
Peer reviewed article  

Also published as
  • Amarasinghe, M.D.; Balasubramaniam, S. (1992). Net primary productivity of two mangrove forest stands on the northwestern coast of Sri Lanka, in: Jaccarini, V. et al. (Ed.) The Ecology of Mangrove and Related Ecosystems: Proceedings of the International Symposium held at Mombasa, Kenya, 24-30 September 1990. Developments in Hydrobiology, 80: pp. 37-47, more

Available in  Authors 
Document type: Conference paper

Keyword
    Brackish water

Authors  Top 
  • Amarasinghe, M.D.
  • Balasubramaniam, S.

Abstract
    Productivity studies were carried out from September, 1985 to August, 1987 in two mangrove stands, i.e. estuarine and island fringing, in Dutch bay, a lagoon situated on the northwestem coast of Sri Lanka. Net above-ground prirnary productivity was measured by monitoring litterfa1l and above-ground biomass increment. The average annual rate of litterfall in the estuarine and island-fringing mangrove stands are 588.14 9 m -2 (approximately 6 t ha -1) and 407.33 9 m-2 (approximately 4 t ha-1) respectively. The average annual rates of above ground woody growth are 614.74 9 m -2 (approximately 6 t ha-1) in the estuarine stands and 286.8 9 m -2 (approximately 3 t ha -1) in the island-fringing mangrove stands. Hence estuarine mangrove stands record a higher annual rate of above-ground net primary production (NPP; 1207.88 9 m -2 or approximately 12 t ha -1) than the fringing mangrove stands (694.22 9 rn -2; approximately 7 t ha -1). The annual rate of NPP in the water front zones ofthe stands (1300.47 9 m -2 in the estuarine stands and 874.56 9 m -2 in the fringing stands) are greater than those in the back- mangrove zones (115.28 9 m -2 in the estuarine stands and 513.88 9 m -2 in the island-fringing stands). These variations may be attributed to the differences in tidal flushing and influence of freshwater in the two localities.

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