Population structure of Scotch broom (Cytisus scoparius) and its invasion impacts on the resident plant community in the grasslands of Nilgiris, India

We investigated age and size class structures of Scotch broom stands, and the effects of invasion on the native plant community, in the high-altitude grasslands of the Nilgiris, South India. Girth, height and age of broom stems were recorded. Native vegetation cover was assessed under broom and in the surrounding grasslands. Age was positively correlated with girth and height of broom. Middle-age classes were better represented than the younger classes. Species richness and diversity of native plants were affected by invasion intensity, but not duration.