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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.
Naslagwerk over ziekten (veroorzaakt door schimmels, bakterien en virussen) van belangrijke bomen voor bossen en parken in Engeland, met uitgebreide illustraties van symptomen
The landscape and vegetation of the Dolomites have characteristics that are very particular. Some 2300 species live here, about a fifth of the flora in Europe as a whole. This book depicts what the plant cover of the Dolomites is composed of, how it was formed, and what future evolution may bring. The data presented is based on the authors’ combined botanical research, which consists of thousands of surveys throughout the entire region of the Dolomites. To explain the vegetation, 106 plant communities are described in detailed datasheets. Biological, geological, climatic and physical-chemical parameters are given for each plant community, including a description of the habitat, the indicator species, the floristic composition, distribution, conservation, and alteration risks, as well as a distribution map and a photo of the association. The associations are grouped into habitats, such as the human habitat, natural forests and meadows on the valley floor, the coniferous forest belt, screes, alpine vegetation on granite, porphyry, and volcanic rock, as well as on dolomite and limestones. In closing, the authors make a case for using the scientific information provided in the book for the conservation of the Dolomites, the heritage of all humanity. Additional in-depth analysis will be presented in the supplementary volumes “Plant Life of the Dolomites: Vegetation Tables” and “Plant Life of the Dolomites: Atlas of Flora.”