Relative to Northern Grasslands in South-Central Canada and North-Central
United States
35. Buell, M.F., and H.F. Buell. 1959. Aspen invasion of prairie. Torrey
Bot Club Bul 86:264-265.
Aspen propagative roots extend over 20m into prairie haylands. The authors
calculate age and growth rate of the roots and suggest that recurrent fire
formerly prevented aspen invasion into grasslands.