Call number:
ZSP-202-253
In:
Research report
Description / Table of Contents:
CONTENTS: Preface. - Abstract. - Introduction. - Theoretical considerations. - Method of canopy evaluation. - Application to forest problems. - Forest blowdown. - Radioactivity gradient. - Phenology. - Forest types and structure. - Distribution of leaves and canopy gaps. - Light quality. - Discussion and summary. - Literature cited.
Description / Table of Contents:
A technique for evaluating forest canopies was developed based on the use of a divergent lens system to obtain hemispherical photographs of tree crowns. The photography was processed from 35 mm film and enlarged as a silhouette, and the light transmission was measured with a specially fabricated macrodensitometer. It is concluded that the amount of forest canopy can be expressed as canopy closure index (CCI) at a precision of approximately 5%. It is shown by application to a variety of problems in diverse geographical areas that this technique can be used for measuring both temporal and spatial changes in the canopy, for estimating the shade light climate, and for specifying the probability of target detection through a canopy. Data are presented to analyze changes caused by explosions, radioactivity, growing season, and vegetation types. The geometry of gaps in tree crowns is discussed and the nature of shade light quality under forests is illustrated.
Type of Medium:
Series available for loan
Pages:
v, 20 Seiten
,
Illustrationen
Series Statement:
Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 253
URL:
https://www.worldcat.org/de/title/6071924
Language:
English
Location:
AWI Archive
Branch Library:
AWI Library
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