128
monsoon to 98.19  ±  6.12  ppm dry wt. (at Kakdwip) during monsoon in root,
21.04 ± 1.64 ppm dry wt. (at Bagmara) during premonsoon to 87.98 ± 4.16 ppm dry
wt. (at Sagar south) during monsoon in stem and 19.47  ±  1.59  ppm dry wt. (at
Bagmara) during premonsoon to 54.15 ± 4.67 ppm dry wt. (at Sagar south) in leaf.
For Cu, the values in root, stem and leaf ranged from 16.29 ± 1.29 ppm dry wt. (at
Bagmara) during premonsoon to 38.33  ±  3.16  ppm dry wt. (at Kakdwip) during
monsoon in root, 13.89  ±  1.34  ppm dry wt. (at Bagmara) during premonsoon to
31.12 ± 2.64 ppm dry wt. (at Kakdwip) during monsoon in stem and 12.23 ± 1.26 ppm
dry wt. (at Bagmara) during premonsoon to 24.82 ± 1.64 ppm dry wt. (at Kakdwip)
in leaf of A. marina. In 2014, for the same species the values ranged from
21.18 ± 1.62 ppm dry wt. (at Bagmara) during premonsoon to 43.19 ± 3.51 ppm dry
wt. (at Kakdwip) during monsoon in root, 18.78 ± 1.03 ppm dry wt. (at Bagmara)
Kakdwip
Harinbari
Chemaguri
Sagar south
Lothian island
Jambu island
Frasergunj
Gosaba
Chotomollakhali
Bali island
Sajnekhali
Bagmara
40
35
25
15
5
0
10
20
30
Root Premonsoon
Stem Premonsoon
Leaf Premonsoon
Leaf Monsoon
Stem Postmonsoon
Leaf Postmonsoon
Stem Monsoon
Root Postmonsoon
Root Monsoon
Concentration of Cu (ppm dry wt.)
Fig. 5.19 Spatio-temporal variations of Cu (in ppm dry wt) in the vegetative parts of Avicennia
alba during 2013
Kakdwip
Harinbari
Chemaguri
Sagar south
Lothian island
Jambu island
Frasergunj
Gosaba
Chotomollakhali
Bali island
Sajnekhali
Bagmara
Root Premonsoon
Stem Premonsoon
Leaf Premonsoon
Leaf Monsoon
Stem Postmonsoon
Leaf Postmonsoon
Stem Monsoon
Root Postmonsoon
Root Monsoon
45
35
25
15
5
0
10
20
30
40
Concentration of Cu (ppm dry wt.)
Fig. 5.20 Spatio-temporal variations of Cu (in ppm dry wt) in the vegetative parts of Avicennia
alba during 2014
5 Mangroves: A Sink of Heavy Metals