JAPRS & SIS, Vol.34, Part 7, “Resource and Environmental Monitoring”, Hyderabad, India, 2002
adversities leading to mangrove degradation (Anonymous, 3 kh ve
2000). The possible causes for the mangrove degradation and E oh A Field sampling locations
losses identified during GIS analyses are given below. h te
The mangroves in the peripheral zone was readily accessible to
man and cattle due to its proximity to settlements. Therefore,
degradation of the peripheral mangrove could be attributed to-
two major factors 1) felling of mangroves for fuel and timber,
and 2) cattle grazing of the mangrove and regenerating young
ones. Above all, lack of tidal inundation resulted in tidal inlet
chocking, leading to the loss of wetlands and mangroves.
HOTTE Eng
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o Bass 2l
« do (oct
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:; DO (uae) 4 j
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ET SN ,
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e!
s Bengal
che
;. Select ler Spahal Distbuion | Select a zone ENT >
Term Jar dotais
Parameter Pre monsoon Me d
BI 3:4
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ET sas
Sample id BOTTOM
| | Sample cep 041 - 058
| Sun de MA
EL Tite iae TRO
FIG 8: GIS PLOT OF SHOWING THE DISTRIBUTIO
OF THE DO IN DIFFERENT CHANNELS.
The fringe mangroves were not readily accessible by man and
cattle. However, for the Rhizophora sp., a dominant form of Stn. Salinity DO pH
No. Lat Long ppt
the fringe mangroves, sediment supply could be a limiting
factor for the renewal of substratum for propagation. The I II I | II I IT
salinity in station 7, 8, 9 and 10 was in par with coastal waters
d. 925'49" © 46°29” . : ; . : ‘
during the summer season due to lack of fresh water mixing, 1 11725740 79946029 99 | 21134 142177] 81
followed by 3 and 4 where the fresh water mixing was limited,
; M ; 2 11?25'46" ? 46'59" 6.9 24.1 | 4.7 | 4.2 | 7.9 | 8.0
and in 1 and 2, the salinity was very low as tidal inundation was 12546 774659
less. Hence, the possibility of degradation and loss in the fringe 3 112552" | 794739" | 122 | 330 | 39 | 44 | 80 | &i
region could be attributed to lack of freshwater flow from
upstream leading to insufficient sediment supply (Purvaja and 4 | 112529" | 79473277 | 183 | 302 | 31| 42 | 711 80
Ramesh, 2000).
- : 5 11°26'09" |. 79°47°23" 145 | 25.2 | 4.1 | 44 | 7.9 | 8.2
The core mangrove predominantly Avicennia was inaccessible
to man or cattle and one of the high saline tolerant species. 6 11°26’56”. | 79° 47°32> 113.2 | 290 [ 34 1.45 [ 79 82
Hence the degradation and losses could be attributed to
prolonged hyper salinity leading to increase in soil salinity due 7 |.11*2023" ] 79° 4746" 1]-14.2.1. 317 - 3.0 ] 40.1.78. | 82
to lack of fresh water supply or sufficient rainfall or ground
water. Detailed study of soil salinity in this zone is 8 11925*18" | 79*43'19". | 212 | 317 ] 41:1.37 1:20 4 8.1
recommended. In the above circumstances management plan
for the restoration of the mangroves in each mangrove zones 9 | 1172455” | 79748317 | 186 |. 322 | 39 | 44 1.7.1 | 8.2
require unique solutions.
- pe
10 | 11°24’11” | 79° 4835” 154 | 319 | 39 | 43. | 78 | 82
The core mangrove comprising predominantly Avicennia was
inaccessible to man or cattle and highly saline tolerant. Hence Annual 1996 683.2mm 1997 636.9mm
- the degradation and losses could be attributed to prolonged Rainfall
— ee TA
hypersalinity due to lack of freshwater supply or insufficient Table-1: Field Obser vation on Salinity, DO & pH at different
rainfall or ground water leading to increase in soil salinity. Sample Points during I - monsoon 98, II - summer 99.
Detailed study of soil salinity in this zone is recommended. In
the above circumstances management plan for the restoration of
the mangroves in each mangrove zone requires unique
solutions.
428
b om 0 r^
