Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Niche width and diversity pattern in different landscapes of an alpine grazingland in Garhwal Himalaya, India.

Abstract

Data are presented on niche width/location, species diversity, β-diversity, equitability, P×F (presence × frequency) index and CI (continuum index) for important herbs and graminoids in 5 sample stands in an alpine grazing land in Panwali Kantha (Garhwal, Western Himalaya, Uttar Pradesh). The stands were at different aspects (SW, SE or E.) and altitudes (3400-3600 m) and included 2 Carex-forb communities, a Danthonia-forb community, a Poa-Trachydium community and a Poa-Agrostis community; assessments were made over 2 successive growth periods (May-October 1995-96). Among the graminoids Phleum alpinum exhibited maximum niche width, and Bupleurum lanceolatum and Taraxacum officinale showed maximum niche location. Higher β-diversity and equitability values in one of the Carex-forb communities indicated rapid change in species composition and community heterogeneity according to species adaptability and growth requirements. CI values demonstrated the impact of environmental gradients on the vegetation well.