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Water extracts of 56 plants common in jack pine forests were used as moistening media for jack pine (Pinus banksiana Lamb.) seed germination tests. Nine of these extracts consistently inhibited germination. Five extracts often stimulated germination. Greenhouse tests indicated rapid denaturing of biologically active substances and stimulation of growth by Cornus canadensis. Field tests showed definite inhibition of Pinus banksiana germination in the presence of Prunus pumila, Gaultheria procumbens, and Solidago juncca. Best germination was observed in the presence of Pinus resinosa, Pteridium aquilinum, and Cornus canadensis. It is concluded that biologically active chemicals influence plant succession and distribution.
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Robert Thorson Brown (1967) studied this question.
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