首页|DIVERSITY AND ECOLOGY OF ORCHIDS IN KOKRAJHAR DISTRICT (ASSAM)
DIVERSITY AND ECOLOGY OF ORCHIDS IN KOKRAJHAR DISTRICT (ASSAM)
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NSTL
Extensive field surveys during 1999-2007, reveal the occurrence of 70 species of orchids under 32 genera in Kokrajhar district (Assam). Majority of the species are epiphytic in habit and they are better represented along the peripheral zones of the forest than in their core zones. Dendrobium with 14 species is the largest genus in the district and is followed by Eria with six species; and Acampe, Aerides, Bulbophyllum and Oberonia with 4 species each. Seven genera are represented by two species each,and the remaining 2G genera by a single species each. Chirang Reserve Forest is the richest orchid habitat in the the district; it supports all the presently collected species. Dendrobium aphyllum (Roxb.) C.E.C. Fischer and Papilionanthe teres (Roxb.) Schltr. are identified as the pioneer species in the epiphytic orchid community dynamics, whereas Dendrobium moschatum (Buch-Ham) Sw. and Flickingeria fugax (Reichb.f.) Seidenf. form the dominant climax vegetation in the said community dynamics in the tropical deciduous forests. Cymbidium aloifolium (L.) Sw. is identified as an indicator species for degraded habitat for epiphytic orchids; it exhibits pseudo dominance when natural habitat is completely lost.
N Basu matary、R K Bora、CM Sarma
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Department of Botany, B.N. College, Dhubri, Assam-783 324, India
NSTL
