Phytotoxic Effects of Cherrybark Oak
Growth of natural vegetation as well as survival and growth of planted seedlings of cherrybark oak (Quercus falcata var. pagodaefolia Ell.) were much less beneath large seed trees of cherrybark oak. In greenhouse studies, germination and seedling growth were reduced in soils collected beneath cherrybark oak. Cold-water extracts of fresh, whole leaves of cherrybark oak contained a substance which inhibited growth of sweetgum (Liquidambar styraciflua L.) seedlings. Chromatographic and spectrophotometric analyses revealed that the primary inhibiting substance in leaf extract was salicylic acid. Leaching of this substance from oak crowns by rain presumably causes inhibition of the understory beneath cherrybark oak. Forest Sci. 17: 180-185.
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