197
direction most part of the agricultural lands are converting from agricultural crops
to shrimp cultivation due to high salinity intrusion. As a result the soil fertility of
agricultural lands are losing its fertility.
The major cities like Calcutta is still located in the upper north and Mongla,
Bagerhap, Sathkhira, Khulna cowns are located under this salinity threshold line
(Fig. 6.6). On the other hand most of the coastal towns in the deltaic region are also
affected due to high salinity intrusion. The traditional urban vegetation and crops
are also changing due to salinity intrusion in the urban areas of the Bengal coastal
region. In Fig. 6.6 the red line illustrates the salinity thresholds line for agricultural
crops and vegetation productivity.
The threshold line which is indicating that the contour of exceeded threshold
value (43,220 dS/m), which is harmful and threat for normal agricultural crops production and coastal urban vegetable production as well as high threat for safe drinking water availability in the coastal towns in Bangladesh. The coastal region of the
Bengal delta of Bangladesh which is declared as Bengal coastal region is 47,000 km
2
is now under threat for agricultural crop production and urban biodiversity conservation. As well as the present condition is penetrating the coastal urban food security when agricultural productivity is gradually reducing in the coastal region in
Bangladesh.
Fig. 6.5 The mangrove vegetation and biodiversity in the coastal wetland areas in Sundarbans
region in Bangladesh
6 Degraded Coastal Wetland Ecosystems in the Ganges-Brahmaputra Rivers Delta…
direction most part of the agricultural lands are converting from agricultural crops
to shrimp cultivation due to high salinity intrusion. As a result the soil fertility of
agricultural lands are losing its fertility.
The major cities like Calcutta is still located in the upper north and Mongla,
Bagerhap, Sathkhira, Khulna cowns are located under this salinity threshold line
(Fig. 6.6). On the other hand most of the coastal towns in the deltaic region are also
affected due to high salinity intrusion. The traditional urban vegetation and crops
are also changing due to salinity intrusion in the urban areas of the Bengal coastal
region. In Fig. 6.6 the red line illustrates the salinity thresholds line for agricultural
crops and vegetation productivity.
The threshold line which is indicating that the contour of exceeded threshold
value (43,220 dS/m), which is harmful and threat for normal agricultural crops production and coastal urban vegetable production as well as high threat for safe drinking water availability in the coastal towns in Bangladesh. The coastal region of the
Bengal delta of Bangladesh which is declared as Bengal coastal region is 47,000 km
2
is now under threat for agricultural crop production and urban biodiversity conservation. As well as the present condition is penetrating the coastal urban food security when agricultural productivity is gradually reducing in the coastal region in
Bangladesh.
Fig. 6.5 The mangrove vegetation and biodiversity in the coastal wetland areas in Sundarbans
region in Bangladesh
6 Degraded Coastal Wetland Ecosystems in the Ganges-Brahmaputra Rivers Delta…