Spatial extent of impact of red alder on soil chemistry of adjacent conifer stands
1992
Rhoades, C.C. | Binkley, D.
We examined patterns in soil N availability and pH along transects extending from mixed stands of conifers (mostly Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)) and red alder (Alnaus rubra Bong.) to pure conifer stands at two locations. At the relatively infertile Wind River site, increased N availability was apparent for about 8-12 m downslope of the alder-conifer stand, but no effect was apparent upslope. At the fertile Cascade Head site, no trend was apparent in N availability across the stand boundaries, but soil pH in the conifer stand was depressed for about 5 m from the alder-conifer stand. Overall, the effects of alder on soil chemistry appeared limited to a distance of less than half the height of the trees.
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