Excerpt from The Great Basin Naturalist, 1980, Vol. 40Stem xylem water potential (predawn) of conifers along a 10 x 50 m transect from meadow through aspen to conifer was mea sured with a pms pressure bomb (waring and Cleary 1967) on 3 August 1977. At least three different branches of each spruce or fir were measured, these trees were all about 1 m tall. Tree Species population structure along this same transect was assessed by aging stems and estimating their heights. Ages were determined by counting terminal bud scale scars or annual growth rings in xy lem cores. In the latter case, the age at the coring height m) was corrected to total age by adding 5 years for aspen and 20 years for fir or spruce, values based on average number of bud scale scars at that height.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.