Structure and Some Dimensional Relations of Six Clones of Salix and Clone of Populus (Trichocarpa X Deltoides) from a Clonal Trial at Studsvik, Sweden

摘要

The morphlogy and dimensional relations of current shoots on two-year-old stools of six Salix and one Populus clone were studied. The aims of the study were (a) to describe the structure of the shoot population, (b) to develop regression relationships for estimating shoot dry weight and surface area from non-destructive measurements. Results reported here refer to a single occasion in autumm 1978, but were intended to give guidance in the preparation of sampling system for actively growing stand. Shoot basal diameter was the estimative variable which gave rise to the smallest absolute and relative standard errors of estimate for the various characters studies studied. Although the form of the relationships was similar for all clones studied, when joint relationships were applied to individual clones, systematic errors of estimation occurred for most characters. Estimates of the variance of the characters studied cannot confidently be used in developing a samplling system for growing stands. The change in variance with time during the growing season needs to be studied seperately. Since most of the relationships found were specific for individual clones, they should be used with caution for estimates in clones not included in the present material or differing in respect e.g. of stool age. (ERA citation 07:042872)