This is the first edition of the book which is written for the students studying in the field of ecology, forestry courses as under graduate, Post-graduate and research level. The content provides the method to analyze the threat and conservation status of various vegetation types by analyzing the IVI, richness in number of kinds of species, their average IVI in terms of significant or non-significant diversity. The present status of diversity, optimal number and average IVI for significant diversity has been evaluated. The content of this work had been published in the "Journal of Medicinal Plants Studies 2017; 5(4): 07-12, Eco. Env. & Cons. 23 (September Suppl.), 2017; pp. (S363-S371) EM International, Journal of Pharmacognosy and Phytochemistry 2017; 6(4): 544-549 International Journal of Fauna and Biological Studies 2017; 4(4): 120-125, Journal of Agriculture and Ecology Research International 16(1): 1-16, 2018 and Vindhya Bharti research journal no 14 Vol. 1, July 2017".