Abstract
Plant species diversity of plantation forest and degraded forest in Surajpur block (Barotiwala) of Kuthar Forest Range in Kunihar Forest Division of Himachal Pradesh was studied in October, 2000. The number of herbs and grasses species under plantation forest and degraded forest was 31 m-2 and 25 m-2, respectively. On the basis of importance value index (IVI), Justicia simplex and Andropogon sp. were observed to be the dominant herbs under plantation forest and degraded forest, respectively. In general, distribution of most of plant species was contiguous. Index of dominance was lower and index of diversity was higher for shrubs and herbs species under plantation forest than that of degraded forest. Index of diversity for herbs was 4.40 in plantation forest and 3.70 in degraded forest. The index of dissimilarity for herbs between plantation forest and degraded forest was high indicating remarkable degree of dissimilarity in herbs species. However, there was plenty of similarity between plantation forest and degraded forest as far as shrubs species under them was concerned. The soil under plantation forest has better fertility status in comparison to degraded forest.
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