Nature Environment and Pollution Technology

Ranjit Dutta ¹, Debojit Baruah ¹, S. K. Sarma ², Lakhi Prasad Hazarika ³

Affiliations
1 Department of Botany, Lakhimpur Girls' College, P.O. Khelmati, Lakhimpur-787 031, Assam, IN
2 Department of Botany, Gauhati University, Guwahati, Assam, IN
3 Department of Zoology, North Lakhimpur College, Assam, IN

Abstract

Pre-impact studies of the 2000 MW lower Subansiri dam have been carried out from January 2006 to December 2006 on certain hydrobiological aspects of downstream of the river Subansiri viz., physicochemical parameters, phytoplankton, zooplankton and freshwater fish diversity. The water quality is suitable for planktonic and fish diversity. In thedownstreamof proposed dam, a total of 199 taxa have been recorded and identified which include 48 species of algae, 23 species of zooplankton, and 128 species of freshwater fishes belonging to 9 orders, 27 families and 78 genera.

Keywords

River Hydrobiology, Plankton, Fishes, Subansiri River Dam.

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Sanjeeb Kr. Nath ¹, S. K. Sarma ²

Affiliations
1 Department of Botany, Dhing College, Dhing, Nagaon-782 123, Assam, IN
2 Department of Botany, Gauhati University, Guwahati-781 014, Assam, IN

Abstract

The flora of Laokhowa Wildlife Sanctuary consists of many useful plants having great commercial as well as socio-economic importance. Some of these plants have already been utilized and a large number of species are consumed by the forest villagers and the villagers of surrounding areas. Promising plant resources of the sanctuary, categorized like timber plants, fibre-yielding plants, and oil yielding and other minor forest products yielding species, have been enumerated.

Keywords

Laokhowa Sanctuary, Biosphere Reserve, Forest Species, Plant Resources, Floristic Work.

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Sanjeeb Kumar Nath ¹, S. K. Sarma ²

Affiliations
1 Department of Botany, Dhing College, Dhing, Nagaon-782 123, Assam, IN
2 Department of Botany, Gauhati University, Guwahati-781 014, Assam,, IN

Abstract

The study deals with analysis of soil of Laokhowa Wildlife Sanctuary of Assam to understand the physico-chemical properties. The soil is mainly alluvial in nature. The texture varies from sandy and loamy sandy to clay loam. The removal of finer soil particles from the soil surface during rainy season might have contributed to sandy or sandy loam nature, and accumulation of finer soil particles and deposition of clay during flood have resulted in clayey loam nature of soil in different parts of the sanctuary. The soil is acidic in nature with soil pH varying from 4.36-6.86. Logging and grazing have direct effect on physical and chemical conditions of soil, nutrient content and decomposition rate of litter. Organic carbon varies from 0.09- 3.24% and the difference may be attributed to recurrent floods and addition of plant litter and animal remains. In general, different chemical properties of the soil show variations to a great extent. The variation in the chemical content in different parts of the sanctuary may be due to periodic flood, siltation and excessive biotic interferences.

Keywords

Wildlife Sanctuary, Biotic Interferences, Floodwater, Soil Texture, Overgrazing, Deforestation, Acidification of Soil.

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