Floristic composition and ecological assessment of tree species diversity in tropical forests of Srikakulam and Vizianagaram districts of Andhra Pradesh, India

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Year 2015 Vol 4 Issue 1
Document Type : original article
¹Duvvada Srinivasa Rao ² Prayaga Murty Pragada ³ Owk Aniel Kumar
¹D e p a r t m e n t o f Botany, Andhra University, Visakhapatnam - 530003, Andhra Pradesh, India
²D e p a r t m e n t o f Botany, Andhra University, Visakhapatnam - 530003, Andhra Pradesh, India
³D e p a r t m e n t o f Botany, Andhra University, Visakhapatnam - 530003, Andhra Pradesh, India
Abstract
Phytosociological investigation of vegetation serves as a pre - requisite for investigating the details of the primary productivity of an ecosystem. The present study deals with Environmental Statistics and Ecological Assessment of tree species diversity in Srikakulam and Vizianagaram districts of Andhra Pradesh, India.

The present investigation deals with the comparison of species diversity indices of plant species i.e., Simpson’s index, Shannon – wiener index, species richness with other counter parts. Importance Value Index = Relative density + Relative frequency + Relative dominance Based on the frequency classes of tree species were determined. According to Raunkiaer classify to There are 5 frequency classes, i.e. 'A ' c lass with the species of frequency ranging from 1 - 20%; 'B' class 21 - 40%; 'C' class 41 - 60%; 'D' class 61 - 80% and 'E' class 81 - 100% based on the frequency pattern of the community, the homogeneity and heterogeneity of the vegetation.
The study resulted in documentation of total 165 tree species, belonging to 119 genera and 50 families were recorded, and 160 are dicot s a nd 5 are monocots. The ecological studies have taken up to visualize the positive impact of protection on tree diversity. Conclusion: An understanding of the distribution of tree species and their assemblages must play an important role in elucidating the lar ger patterns of distribution of diversity. The quantitative inventory of tree species diversity revealed a considerable variation in the composition of dominant species and density in various forest areas and the estimations of IVI have helped to understanding t he ecological significance of the species, present in different communitie
Keywords
Floristic composition, Ecological assessment, tree species diversity, Srikakulam and Vizianagaram
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