Key points are not available for this paper at this time.
Jonathan Silvertown, Miguel Franco, Irene Pisanty, Ana Mendoza, Comparative Plant Demography--Relative Importance of Life-Cycle Components to the Finite Rate of Increase in Woody and Herbaceous Perennials, Journal of Ecology, Vol. 81, No. 3 (Sep., 1993), pp. 465-476
Silvertown et al. (Wed,) studied this question.