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Growth was strongly related to growing stock level (GSL) for 5 years after thinning 20-year-old poles on Site Index50 115 land at the Elliot Ranch Plantation in northern California. Five GSL's- basal areas anticipated when trees average 10 inches d. b. h. or more - ranging from 40 to 160 square feet per acre were tested. Periodic annual increment (PAI) in diameter decreased curvilinearly from 0.51 to 0.21 inch, with increasing GSL's from 40 to 160. But only trees in plots heavily thinned to GSL 40 (and briefly in GSL 70) grew faster in diameter after thinning than these same trees grew before thinning. PAI in basal area and net volume rose steadily with increasing GSL9s, reaching 9.0 square feet and 255 cubic feet per acre, respectively, at GSL 160. Apparently, even light thinning reduced volume production, but thinning still is recommended to shorten time until first commercial entry and to promote stand health.
Excerpt from Growth of Immature Stands of Ponderosa Pine in the Black Hills Combinations of the variables sampled can be determined by noting the locations of the entries in tables 4 to 9 (see pages 8 to Each plot was carefully checked for uniformity of density, age, and site index. None of the plots had been thinned or otherwise disturbed during the 20-year period preceding measurement. A complete inventory was made on each plot, and data were obtained for computing the past stand. All trees were bored to determine radial growth at breast height for the past 10 and 20 years. Heights were measured on a sample of the trees and past height growth was determined by boring. The site index of each plot was computed from soil and topography (myers and Van Deusen, 1960b)to avoid errors due to the effect of stand density on tree height. Average age of the main stand on each plot was determined; occasional small invaders in stands of low density were omitted. Dead trees were measured and classed as having died 0-10, 11-20, or 21+ years ago. Dead trees on permanent plots and in stands thinned at known dates were used as guides in estimating time of death. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.
Vegetation at the Glacier Lakes Ecosystem Experiment Site, a 600 ha research site at 3200 to 3500 m elevation in the Snowy Range of southeastern Wyoming, was categorized and described from an intensive sampling of species abundances. A total of 304 vascular plant taxa were identified through collection and herbarium documentation. Plots with tree species were separated from those without tree species for ordination and classification analyses. Detrended correspondence analysis was used to order plots along major axes of composition variation, which are inferred moisture and topographic gradients. Cluster analysis was used to categorize plots based on composition similarity. The resulting groups were named according to species dominants. We identified and described in detail 4 meadow, 4 thicket or scrub, 3 krummholz, and 2 forest plant associations.