92
At Diamond Harbour, dissolved phosphate concentration ranged from 1.54 ppm
(during premonsoon in 1984) to 6.99 ppm (during premonsoon in 2009) (Fig. 4.14).
At Namkhana, dissolved phosphate concentration ranged from 0.98 ppm (during
premonsoon in 1984) to 6.05 ppm (during premonsoon in 2009) (Fig. 4.15).
Ajmalmari, the station in the Matla estuary exhibited a phosphate value from
0.56 ppm (during premonsoon in 1984) to 2.96 ppm (during premonsoon in 2009)
(Fig. 4.16). In both Diamond Harbour and Namkhana of the Hooghly estuarine
system, phosphate has increased 1.96 μg at l
−1
/decade and 2.11 μg at l
−1
/decade
respectively. In Ajmalmari, located in the Matla estuarine complex, the rate of
increase is 0.92 μg at l
−1
/decade.
Fig. 4.6 Paddy field and small scale shrimp farms in the mangrove ecosystem: a potential source
of nitrogen and phosphorus
Fig. 4.7 Different size of feed used for feeding the culture species
4 Mangroves: A Nutrient Retention Box
At Diamond Harbour, dissolved phosphate concentration ranged from 1.54 ppm
(during premonsoon in 1984) to 6.99 ppm (during premonsoon in 2009) (Fig. 4.14).
At Namkhana, dissolved phosphate concentration ranged from 0.98 ppm (during
premonsoon in 1984) to 6.05 ppm (during premonsoon in 2009) (Fig. 4.15).
Ajmalmari, the station in the Matla estuary exhibited a phosphate value from
0.56 ppm (during premonsoon in 1984) to 2.96 ppm (during premonsoon in 2009)
(Fig. 4.16). In both Diamond Harbour and Namkhana of the Hooghly estuarine
system, phosphate has increased 1.96 μg at l
−1
/decade and 2.11 μg at l
−1
/decade
respectively. In Ajmalmari, located in the Matla estuarine complex, the rate of
increase is 0.92 μg at l
−1
/decade.
Fig. 4.6 Paddy field and small scale shrimp farms in the mangrove ecosystem: a potential source
of nitrogen and phosphorus
Fig. 4.7 Different size of feed used for feeding the culture species
4 Mangroves: A Nutrient Retention Box