© 2001 Heron Publishing—Victoria, Canada
Growth and annual ring structure of Larix sibirica grown at different carbon dioxide concentrations and nutrient supply rates
Kenichi Yazaki (1), Ryo Funada (1, 6), Shigeta Mori (2), Yutaka Maruyama (3), Anatoly P. Abaimov (4), Masazumi Kayama (1) and Takayoshi Koike (5)
1. Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan / 2. Forestry and Forest Products Research Institute, Tohoku Research Center, Morioka 020-0123, Japan / 3. Forestry and Forest Products Research Institute, Hokkaido Research Center, Sapporo 062-8516, Japan / 4. Sukachev Institute of Forestry, Siberian Branch, Akademgorodok, Krasnoyarsk 660036, Russia / 5. Hokkaido University Forests, FSC, Sapporo 060-0809, Japan / 6. Author to whom correspondence should be addressed (funada@for.agr.hokudai.ac.jp) / Received September 18, 2000
Summary
We compared effects of ambient (360 vpm) and elevated (720 vpm) carbon dioxide concentration ([CO2]) and high and low nutrient supply rates on stem growth, annual ring structure and tracheid anatomy of Siberian larch (Larix sibirica Ledeb.) seedlings over two growing seasons. Elevated [CO2] had no significant effect on either stem height or diameter growth; however, both stem height and diameter growth were enhanced
by the high nutrient supply rate, and these increases were stimulated by elevated [CO2]. Elevated [CO2] tended to increase the width of the annual xylem ring, the number of cells in a radial file spanning the ring, and tracheid
lumen diameter, whereas it tended to reduce cell wall thickness, although there were no statistically significant CO2 effects on tracheid anatomy. Changes in tracheid cell morphology seemed to be dependent on changes in shoot elongation rates.
Keywords:
annual ring width, elevated carbon dioxide, [CO2], Siberian larch, stem morphology, tracheid dimensions.
