Uddin MJ, Mohiuddin ASM, Hossain ST and Hakim A
Bangladesh is traversed by numerous rivers and it comprises most of the delta of three great rivers- the Ganges, the Brahmaputra and the Meghna. Specifically, the greater part of northeast region is taken up by the wetland basin and is characterized by the presence of numerous large, deeply flooded depressions, known as haors, between the rivers where Hakaluki haor is one of them. A study was conducted using the soil and landform information of 1985 and 2003 of Hakaluki haor wetland ecosystem. Areas of soil boundaries between 1985 and 2003 were estimated using polygon attribute tables (PAT) files which revealed that this wetland ecosystem has been decreasing at an alarming rate due to sedimentation from the surrounding hilly areas. These estimates were verified using the land type information because soil boundaries and land types are the inter-related issues. Besides, a soil profile study also revealed that a buried horizon formed beneath the plow layer which signifies the sedimentation. Thus, the wetland ecosystem degradation seriously affects the bio-resources of the study sites. A sustainable technology should be adopted to prevent the degradation of hilly lands and conservation and caring of soil resources in the basins.
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