Abstract
Studies to evaluate the changes in plant diversity and chemical properties of soil under the plantations of Cupressus torulosa D. Don and Robinia pseud-acacia Linn. raised on mine overburden areas near Paonta Sahib in Sirmour District of Himachal Pradesh were carried out during August, 2000. The number of ground flora species as recorded under Cupressus torulosa and Robinia pseud-acacia plantations were 30 m-2 and 42 m-2 respectively. On the basis of Importance Value Index (IVI), Oplismenus compositus and Eupatorium adenophorum were found to be the dominant herbs under Cupressus torulosa and Robinia pseud-acacia plantation respectively. In general, distribution of most of ground flora species was contiguous. Index of dominance was lower and index of diversity was higher for ground flora under plantations as compared to the exposed mine overburden area. The ground flora under Robinia pseud-acacia has highest diversity index (4.223). The index of dissimilarity between plantations and exposed mine overburden area was high indicate remarkable degree of dissimilarity in ground flora species. However, there was plenty of similarity between two plantations as far as ground flora under them was concerned. Soil under plantations revealed better fertility status in comparison to exposed mine overburden area.
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