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Effects of CO2 Concentration and Nutrient Status on Growth, Growth Rhythm and Biomass Partitioning in a Willow, Salix phylicifolia

J. Silvola and U. Ahlholm
Oikos
Vol. 67, No. 2 (Jun., 1993), pp. 227-234
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3545467
Stable URL: http://www.jstor.org/stable/3545467
Page Count: 8
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Effects of  CO2 Concentration and Nutrient Status on Growth, Growth Rhythm and Biomass Partitioning in a Willow, Salix phylicifolia
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Abstract

Cuttings of the willow Salix phylicifolia were grown in pots containing moist organic-rich soil for four months in closed chambers at 4 CO2 concentrations (300, 500, 700, 1000 ppm) and 4 nutrient levels (fertilization of 0, 100, 500, 1000 kg ha-1 monthly). The plants received natural light, but the average temperature was 3-6°C higher than out of doors. Both CO2 concentration and fertilization affected biomass production, the average increase caused by CO2 enhancement being approx. 100%, Nutrient level had a considerable effect on the increased biomass production achieved by CO2 enhancement, since the increase was minimal at lower nutrient levels. At the same time the effect of fertilization was dependent on the CO2 concentration, the production increase caused by fertilization being much less at 300 ppm than at the other CO2 concentrations. CO2 concentration and fertilization had the opposite effects on biomass partitioning, a higher nutrient level increasing the proportion of the biomass located in the stems and a higher CO2 concentration that in the roots. Both fertilization and CO2 concentration affected the growth rhythm, a high CO2/nutrient ratio leading to a shorter growing season and a low ratio to a longer one.

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