PRECISION MEASUREMENT OF RADIAL GROWTH AND DAILY RADIAL FLUCTUATIONS IN DOUGLAS FIR | Zendy

Giles Warrack | Zendy; C. Joergensen | Zendy

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PRECISION MEASUREMENT OF RADIAL GROWTH AND DAILY RADIAL FLUCTUATIONS IN DOUGLAS FIR

Author(s) -

Giles Warrack,

C. Joergensen

Publication year - 1950

Publication title -

the forestry chronicle

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.335

H-Index - 49

eISSN - 1499-9315

pISSN - 0015-7546

DOI - 10.5558/tfc26052-1

Subject(s) - dial , thinning , douglas fir , computer science , statistics , environmental science , test (biology) , mathematics , engineering , ecology , forestry , geography , electrical engineering , biology

The dial indicator, one of industry's precision tools, has been tested over a period of two and a half years to ascertain its suitability as a dendrometer. This study cannot claim to be the first of its kind, nor to yield exhaustive information, and on this basis the instrument should therefore neither be condemned nor accepted in full. The experience gained may be crystallized in a warning The dial indicator is unnecessarily precise for measurement of response of growth to thinning; too many sample trees are required to reduce the influence of biological variation so as to match instrumental precision. The dial indicator is technically inferior to the dendrograph as a recorder of daily fluctuations in stem diameter.The experimental results were found to contribute significantly to a better understanding of the Douglas fir in its relation to environment and silvicuitural management; but in evaluating the experiments as such it should be borne in mind that their original design has been restricted by their basic purpose, namely to test the dial indicator.

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