Key points are not available for this paper at this time.
D. B. Lawrence, R. E. Schoenike, A. Quispel, G. Bond, The Role of Dryas Drummondii in Vegetation Development Following Ice Recession at Glacier Bay, Alaska, with Special Reference to Its Nitrogen Fixation by Root Nodules, Journal of Ecology, Vol. 55, No. 3 (Nov., 1967), pp. 793-813
Lawrence et al. (Wed,) studied this question.