Pike, Lawrence H.; Tracy, Diane M.; Sherwood, Martha A.; Nielsen, Diane. 1972. Estimates of biomass and fixed nitrogen of epiphytes from old-growth Douglas-fir. In: Research on coniferous forest ecosystems: first year progress in the coniferous forest biome, US/IBP: Proceedings of a symposium; 1972 March 23-24 ; Bellingham, WA. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station: 177-187.
Epiphytes are sampled concurrently with measurements of surface area of trunk and branch systems ofold-growth Douglas-fir (Pseudotsuga menziesii). Crude predictions of epiphyte biomass in branch systems arecorrected by more detailed sampling of a subset of branch systems. Nitrogen analyses enable conversion ofepiphyte biomass to the total amount of nitrogen present in the epiphytes.