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 northwestern coast of Sri Lanka. Net above-ground primary productivity was measured by monitoring litterfall and above-ground biomass increment. The average annual rate of litterfall in the estuarine and island-fringing mangrove stands are 588.14 g m−2 (approximately 6 t ha−1) and 407.33 g m−2 (approximately 4 t ha−1) respectively. The average annual rates of above ground woody growth are 614.74 g m−2 (approximately 6 t ha−1) in the estuarine stands and 286.8 g 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 g m−2 or approximately 12 t ha−1) than the fringing mangrove stands (694.22 g m−2; approximately 7 t ha−1). The annual rate of NPP in the water front zones of the stands (1300.47 g m−2 in the estuarine stands and 874.56 g m−2 in the fringing stands) are greater than those in the backmangrove zones (115.28 g m−2 in the estuarine stands and 513.88 g 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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Amarasinghe, M.D., Balasubramaniam, S. (1992). Net primary productivity of two mangrove forest stands on the northwestern coast of Sri Lanka. In: Jaccarini, V., Martens, E. (eds) The Ecology of Mangrove and Related Ecosystems. Developments in Hydrobiology, vol 80. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-3288-8_5
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DOI: https://doi.org/10.1007/978-94-017-3288-8_5
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