Permeability Changes Induced in Three Western Conifers by Selective Bacterial Inoculation


  • Bruce R. Johnson


Tsuga heterophylla, Abies grandis, Pseudotsuga menziesii, permeability, bacteria, Bacillus polymyxa, sapwood, bordered pit membranes, torus


The longitudinal gas permeability and impregnability with paraffin oil of western hemlock, grand fir, and Douglas-fir sapwood markedly increased after exposure to bacteria. Heartwood was not affected. Bacillus polymyxa was more effective in increasing gas permeability than any other single or mixed culture tested. Scanning electron microscopy suggested that this was largely due to degradation of bordered pit membranes.


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