International Science Community Association International Research Journal of Biological Sciences 2278-3202 7 7 2018 07 10 Phytosociological investigation, Biodiversity conservation and Life form pattern in a Holeptelia integrifolia community under Rajaji Tiger Reserve, Uttarakhand, India 13 26 EN Joshi Kinjal 1 Gujarat Ecological Education & Research (GEER) Foundation, Gandhinagar-382007, Gujarat, India Tatu Ketan 2 Gujarat Ecological Education & Research (GEER) Foundation, Gandhinagar-382007, Gujarat, India Kamboj R.D. 3 Gujarat Ecological Education & Research (GEER) Foundation, Gandhinagar-382007, Gujarat, India Ali Md. Romjan 1 Department of Zoology, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh Kamrujjaman Md. 2 Department of Zoology, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh . Akash 1 Gurukula Kangri University, Haridwar, Uttarakhand-249401, India . Navneet 2 Gurukula Kangri University, Haridwar, Uttarakhand-249401, India Bhandari B.S. 3 H.N.B. Garhwal University; Shrinagar, Uttarakhand-246174, India > Research Paper 2018 5 4 2018 07 10 The study assessed different composition of vegetation, pattern of plant diversity as well as biodiversity conservation in Rajaji Tiger Reserve, Haridwar-Pauri forest divison (29°15\' to 30°31\' N, 77°52\' to 78°22\' E, altitude 250–1100 m) in Shivalik Hills of outer Himalaya. The site represents the different combination of dominants and co- dominant species. In trees, most of the species showed contagious pattern of distribution but Listea chinensis, Morus alba Mallotus phillipensis, Cassia fistula showed random pattern of distribution. On the other hand maximum shrubs species showed contagious pattern but only one species showed regular pattern of distribution. In herbs most of the species showed contagious distribution while four species showed the random pattern but none of the species showed regular pattern. The Shannon diversity index for trees was 1.887 and for shrubs and herb it was 1.893 and 2.987 respectively. Plant species with higher number always show high diversity in the forest. The Simpson index for trees was 0.193 and 0.330, for shrubs and herbs it was 0.058. The Pielou eveness index was 0.68 for trees, 0.86 for shrubs and 0.88 for herbs. The species richness index (Margalef index) was 2.60 for trees, 1.21 for shrubs, and 4.82 for herbs. Copyright@ International Science Community Association