The relative importance of light and soil moisture in particular is better known than that of other environmental factors. We are coming to believe that the nature and condition of the reproduction and other surface vegetation beneath living canopies are not due to any single factor such as light or soil moisture, but to a complex of factors.
Toumey, James W., and Raymond Kienholz. 1931. Trenched Plots Under Forest Canopies. Yale School of Forestry Bulletin 30. 31 pp. + figures.
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