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Medientyp:
E-Artikel
Titel:
Seasonal Growth of Dominant, Intermediate, and Suppressed Red Pine Trees
Beteiligte:
Kozlowski, Theodore T.;
Peterson, Theodore A.
Erschienen:
The University of Chicago Press, 1962
Erschienen in:Botanical Gazette
Sprache:
Englisch
ISSN:
0006-8071
Entstehung:
Anmerkungen:
Beschreibung:
<p>1. During 1960 and 1961 a study of cambial growth was conducted with vernier tree ring bands in a thirty-four-year-old red pine (Pinus resinosa Ait.) stand in central Wisconsin. The seasonal rate of cambial growth and time of initiation of cambial growth were studied for trees of dominant, intermediate, and suppressed crown classes. In addition, cambial growth in the upper stem was studied in dominant and intermediate trees for comparison with growth in the lower stem. 2. Dominant trees started growing earlier, grew faster, and had a longer growing season than intermediate trees. Suppressed trees grew negligibly and had a very short growing season. 3. Growth of all trees was highly intermittent throughout the growing season. Individual trees grew, stopped growing, and then resumed growth. Growth cessation of some trees occurred even during the time when the average rate of growth for all trees was greatest. Seasonal growth patterns varied greatly during successive years, indicating extreme sensitivity of diameter growth to environmental stresses. 4. This study emphasized that growth inhibition in suppressed trees resulted from decreased rates of growth, shorter growing season, and later initiation of growth than in intermediate or dominant trees. 5. Trees grew faster in the upper than in the lower stem in both dominant and intermediate trees. In dominant trees there were more instances of growth cessation in the lower part of the stem than in the upper part. But in intermediate trees there were only a few more instances of growth cessation in the lower stem than in the upper stem. At both heights, however, growth cessation and resumption occurred much more frequently in intermediate than in dominant trees. 6. Possible internal causes of growth intermittency are discussed. The delay in growth initiation of the more suppressed trees emphasizes the importance of hormones in competition among trees. 7. Hydration effects on growth measurements of stems are discussed.</p>