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Effect of Minimum Night Temperature on Growth of Seedlings of Pinus densiflora and Betula platyphylla in Container Culture during Winter Season  

홍성각 (건국대학교 산림환경과학과)
윤종규 (임업연구원 중부임업시험장)
윤택승 (임업연구원 중부임업시험장)
김종진 (건국대학교 산림환경과학과)
Publication Information
Journal of Bio-Environment Control / v.11, no.4, 2002 , pp. 163-167 More about this Journal
Abstract
This study was carried out to investigate the effect of minimum night temperature in the PE house on growth of seedlings of Pinus densiflora and Betula platyphylla in winter season. The experiment was performed with three minimum night temperature regimes,5~8$^{\circ}C$, 10~13$^{\circ}C$ and 15~18$^{\circ}C$. The temperature regimes were maintained for 8 weeks (to April 6) after germination peak, and then were broken by increasing natural temperature. The temperature did not affect the germination rate but delayed the germination by 10 days. Height, root collar diameter growth, and dry weight of two species were reduced by relatively low night temperature. The reduction was more obvious in the dry weight of above the ground measured at 8 weeks after germination. The seedlings grown for 8 weeks at 5~8$^{\circ}C$ showed the lowest T/R ratio. It was also observed that the height growth response in Betula platyphylla seedlings to relatively low temperature was more sensitive than Pinus densiflora.
Keywords
container culture; minimum night temperature; early growing stage; growth response; T/R ratio;
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