The Influence of Adjacent Mature Douglas-Fir Forests and Mountain Meadows on Soil Nutrient Cycling, Microbial Activity, and the Occurrence of Ectomycorrhizal Mats
Price, Edwin R.
The long-term effects of vegetation on soil characteristics is important knowledge for foresters. This study was designed to measure some of these effects using old growth Douglas-fir and old field sites in the Willamette National forest and the H.J. Andrews Experimental Forest in the central Oregon Cascades. Soil samples were collected along transects running from old growth forest to old fields. 𝛽-Glucosidase enzyme activity, denitrification potential, and temperature were elevated significantly in old fields compared to old growth forest, while readily degradable carbon, ectomycorrhizal mat distribution and litter depth were found to be higher in old growth than in the fields. In addition, intermediate values for variables studied were observed in transition zones for these tests. Variable trends were found in substrate-induced respiration tests for fungallbacterial dominance. Continued inhabitance of these fields by grass and fern vegetation changes several biochemical and biotic variables and probably serves to inhibit succession to a tree-dominated area.
vii, 23 p.
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