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Annals of Botany 35: 117-126, 1971
© 1971 Annals of Botany Company

RESEARCH-ARTICLE

Growth of One-year-old Douglas Fir Plants at Four Spacings

R. VAN DEN DRIESSCHE

Research Division, British Columbia Forest Service Victoria, B.C.

Received: 11 May 1970   

Six-month-old Douglas fir seedlings were planted at 2-in, 4-in, 6-in, and 12-in spacings in November 1968 into plots which were split into unfertilized and fertilized portions. Height and dry-weight measurements were made from March 1969 to January 1970. Mean seedling dry weight increased with spacing to 6 in, but then decreased as spacing increased from 6 to 12 in. Net assimilation rate (NAR) also showed a similar relationship to spacing, but leaf-area ratio (F) decreased as spacing increased from 2 to 6 in. Decrease in F was related to decrease in the ratio needle area: needle dry weight which occurred with increase in spacing. NAR showed an inverse relationship to leaf-area index (L) in the 2-in, 4-in, and 6-in spacings, and the ceiling value of L appeared to be above the highest value (4) reached. Fertilizer increased final dry weight, height, and L, and increased the proportion of dry matter devoted to stem production at close spacing, and the proportion of root at all spacings. Plant size was limited more by light than nutrient supply at z-in and 4-in spacings.

Final-yield measurements were also made on 4-year-old Douglas fir plants grown for 2 years on unreplicated plots at 4-in, 8-in, 12-in, and 18-in spacings. Results indicated dry-matter production per unit area of ground increased with age at the same L.


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