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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Sep 2012, 33 (5)                                     Back


nstantaneous and historical temperature effects on a-pinene

Analysis of vegetation in an Imperata grassland of Barak valley, Assam

 

Author Details

 

Ashim Das Astapati

Department of Botany, Gurucharan College, Silchar - 788 004, India 

Ashesh Kumar Das

(Corresponding author)

Department of Ecology and Environmental Science, Assam University, Silchar - 788 011, India

e-mail: asheshdas684@hotmail.com

 

 

 

 

 

Publication Data

Paper received:

28 January 2011

 

Revised received:

18 May 2011

 

Accepted:

14 June 2011

 

Abstract

Imperata grassland at Dorgakona, Barak valley, North Eastern India was analyzed for species composition and diversity pattern in relation to traditional management practices. 19 families were in the burnt and unburnt plots of the study site with Poaceae as the most dominant one. 29 species occurred in the burnt plot and 28 in the unburnt plot. Most of the species were common in both the plots. The pattern of frequency diagrams indicated that the vegetation was homogeneous. Imperata cylindrica, a rhizomatous grass was the dominant species based on density (318.75 and 304.18 nos. m-2), basal cover (158.22 and 148.34 cm2 m-2) and Importance value index (IVI) (132.64 and 138.74) for the burnt and unburnt plots respectively. Borreria pusilla was the co-dominant species constituting Imperata-Borreria assemblage of the studied grassland. It was observed that B.  pusilla (162.25 nos. m-2 and 50.37 nos. m-2), I. cylindrica (318.75 nos. m-2 and 304.18 nos. m-2) and Setaria glauca (24.70 nos. m-2 and 16.46 nos. m-2) were benefited from burning as shown by the values sequentially placed for burnt and unburnt plots. Certain grasses like Chrysopogon aciculatus and Sacciolepis indica were restricted to burnt plot while Oxalis corniculata showed its presence to unburnt plot. Grasses dominated the grassland as revealed by their contribution to the mean percentage cover of 72% in burnt plot and 76% in unburnt plot. The dominance-diversity curves in the study site approaches a log normal series distribution suggesting that the resources are shared by the constituent species. Seasonal pattern in diversity index suggested definite influence of climatic seasonality on species diversity; rainy season was conducive for maximum diversity (1.40 and 1.38 in the burnt and unburnt plots, respectively). Dominance increased with concentration of fewer species (0.0021 in burnt plot and 0.0055 in unburnt plot) in summer and behaves inversely to index of diversity. This study showed that the traditional management practices benefits the farmers as it promote grassland regeneration with I. cylindrica as the dominant grass.  

 

Key words

Imperata cylindrica, Borreria pusilla, Poaceae, Importance value index, Barak valley

 

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