Zobel, Donald B.; Hawk, Glenn M.; McKee, W. Arthur; Dyrness, C. T. 1973. Variation in plant moisture stress associated with forest communities in the H.J. Andrews Experimental Forest. Seattle: University of Washington; Coniferous For. Biome Internal Rep. 78. 15 p.
Measurement of plant moisture stress of 1-2 m understory coni-fers was made ia "reference stands" on the H. J. Andrews ExperimentalForest in 1970-1972. Maximum stress each year (measured between mid-night and dawn) is closely correlated with the position of each com-munity along one axis of an ordination of the vegetation. In somestands, stress decreases during rainless periods, for uncertain rea-sons. Apparently, use of different species in different plots doesnot, of itself, lead to differences in stresses measured at the plots.