Net primary productivity of two mangrove forest stands on the northwestern coast of Sri Lanka 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 -2 and 407 g m respectively. The average annual rates of above in the estuarine stands and 287 g m mangrove stands are 588 gm ground woody growth are 615 g m mangrove stands. Hence estuarine mangrove stands record a higher annual rate of above-ground net primary production (NPP; 1203 g m ) than the fringing mangrove stands (694 g m rate of NPP in the water front zones of the stands (1300 g m' -2 -2 in the island-fringing -2). The annual -2 in the estuarine stands and 875 g m -2 in the fringing stands) are greater than those in the back mangrove zones (115 g m in the estuarine stands and 514 g m differences in tidal flushing and influence of freshwater in the two localities. -2 in the island-fringing stands). These variations may be attributed to the Based on the information in the abstract, which of the following state ments is false: O productivity in above-ground biomass increment is greater in the estuarine stand than the island fringing stand
Net primary productivity of two mangrove forest stands on the northwestern coast of Sri Lanka 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 -2 and 407 g m respectively. The average annual rates of above in the estuarine stands and 287 g m mangrove stands are 588 gm ground woody growth are 615 g m mangrove stands. Hence estuarine mangrove stands record a higher annual rate of above-ground net primary production (NPP; 1203 g m ) than the fringing mangrove stands (694 g m rate of NPP in the water front zones of the stands (1300 g m' -2 -2 in the island-fringing -2). The annual -2 in the estuarine stands and 875 g m -2 in the fringing stands) are greater than those in the back mangrove zones (115 g m in the estuarine stands and 514 g m differences in tidal flushing and influence of freshwater in the two localities. -2 in the island-fringing stands). These variations may be attributed to the Based on the information in the abstract, which of the following state ments is false: O productivity in above-ground biomass increment is greater in the estuarine stand than the island fringing stand
Chapter10: Feeds And Feeding
Section: Chapter Questions
Problem 20SA
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Transcribed Image Text:Read the abstract below, and answer the question based on your reading.
Net primary productivity of two mangrove forest stands on the northwestern coast of Sri Lanka
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
-2
-2
mangrove stands are 588 g m
" respectively. The average annual rates of above
-2
and 407 g m
ground woody growth are 615 g m
-2
in the estuarine stands and 287 g m
in the island-fringing
mangrove stands. Hence estuarine mangrove stands record a higher annual rate of above-ground net
primary production (NPP; 1203 gm ) than the fringing mangrove stands (694 g m). The annual
rate of NPP in the water front zones of the stands (1300 g m in the estuarine stands and875 g m
m-2
-2
in the fringing stands) are greater than those in the back mangrove zones (115 gm in the estuarine
-2
-2
stands and 514 g m in the island-fringing stands). These variations may be attributed to the
differences im tidal flushing and influence of freshwater in the two localities.
Based on the information in the abstract, which of the foll owing statements is false:
O productivity in above-ground biomass increment is greater in the estuarine stand than the island
fringing stand
Transcribed Image Text:productivity in above-ground biomass increment is greater in the estuarine stand than the island
fringing stand
productivity in litterfall is greater in the estuarine stand than the island fringing stand
O productivity can be measured in part by measuring carbon in litterfall
O productivity can be measured in part by measuring carbon in above-ground biomass increment
subtracting above-ground biomass increment from litterfall provides the total productivity for a
mangrove stand
Expert Solution
Step 1
Gross primary productivity refers to carbon fixation amount by all the producers present in the given ecosystem during photosynthesis. However, it is not the correct estimate of energy harnessed by the producers as a large amount of energy is lost during respiration. When this part is eliminated from the gross primary productivity, it is known as net primary productivity.
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