The Allelopathic Influence of Broadleaf Trees and Shrubs on Seedlings of Douglas-fir
The allelopathic potential of leaf litter from five species of broadleaf trees and shrubs found in southwestern Oregon on the germination and early growth of Pseudotsuga menziesii was examined. While each of these species showed significant allelopathic potential when tested in a highly artificial system against seeds of cucumber, the observed reductions in growth when tested against P. menziesii ranged from about 44 percent of control growth for Umbellularia californica to about 98 percent of control for Arbutus menziesii. No consistent expression of allelopathy was observed when bioassays, using field soil, were the basis of experimentation. The data show that allelopathy is of potential importance among the many ecological factors which operate under field conditions. Forest Sci. 31:945-952.
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Document Type: Journal Article
Affiliations: Environmental Sciences and Resources/Biology, Portland State University, Portland, OR 97207
Publication date: 1985-12-01
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