Browsing by Subject "Species diversity"

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    Diversity ofTrees in the Darjeeling Foothill Region of Eastern Himalaya
    (University of North Bengal, 2008-03) Rai, U.; Das, A. P.
    Phytosociological investigation using 20 x 20 m quadrats has been made on seven major forest types of Darjiling foothill region within an altitudinal range of 135 m to 1200 m leading to the record of 215 species of trees, 11 species of liana and three species of palms. Analysis of data revealed that the East Himalayan Sal forest showed highest species diversity but have moderate species richness and concentration of dominance. High species diversity and species richness were recorded from Semi Evergreen Mixed forest, Wet Mixed Deciduous Forest & Lower Bhabar Sal Forest with correspondingly low concentration of dominance. Bamboo brake had the lowest species diversity with high concentration of dominance. Computation of similarity index showed a poor relation between different forest types and reflected the developing nature of vegetation. Also, these forests have a high regeneration status with a good species composition. It has also been predicted that the anthropogenic interferences may cause the abrupt change in the structure of these vegetation types.
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    Impact of invasive alien weeds on phytodiversity of Terai-Duars region of West Bengal, India
    (University of North Bengal, 2019-03) Biswas, Kishor; Das, Abhaya Prasad
    The article reports the investigation on the impacts of alien invasive weeds on phyto-diversity of Terai-Duars belt of West Bengal. Invasive weed-invaded and non-invaded vegetation tracts, under same ecological conditions, were sampled and compared to understand their impact on the local biodiversity. Invaded area was inhabitated by a fewer number of species, poor in species diversity, with higher concentration of dominance and poor in species richness. The study suggested further research on the impact of aggressive and invasive alien weeds on Biodiversity and ecosystem of this area.