The survival rate and stem moisture content after planting of Larix kaempferi container seedling according to thawing conditions
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This study was conducted to find out the optimal thawing conditions in connection with refrigerated storage in nursery stage in order to maintain high seedling quality until planting in plantation. Refrigerated container seedlings of <i>Larix kaempferi</i> were produced under 32 different thawing conditions [2 thawing timings (April, May) × 2 shadings (shading, non-shading) × 2 packaging boxes (open, closed) × 4 thawing duration regimes (1, 3, 6, 12 days)] and then planted in plantation. We performed four-way ANOVA to test the effect of the thawing conditions on survival rate (SR) and stem moisture content (SMC) of thawed seedling after planting. The SR of <i>L. kaempfer</i> seedlings was statistically different in each of the four factors, such as thawing timing, shading, packaging box and duration, and significant interactive effects of four factors were also confirmed. Thawing showed a higher SR of seedlings in April than in May. In both thawing timings, it showed the highest SR of seedlings in the thawing condition in which light was shaded and packaging box was opened. As thawing duration increased, SR of seedlings decreased. The shading and thawing duration significantly affected SMC of <i>L. kaempferi</i> seedlings. The SMC of seedlings tended to increase as the thawing duration becomes longer, which is opposite to the result for SR. High temperature in the prolonged thawing duration may result in more active growth of seedlings with enhancing water movement in stem, as refrigerated dormant seedlings started growing with thawing. These results suggest that the best thawing condition is thawing duration of less than 3 days before planting and opening package box in well-ventilated shady locations nearby plantation. The optimal thawing condition will improve the quality of seedling production in nursery stages and increase seedling growth performances in plantation stages.
Keywords: Deforestation and forest degradation, Climate change
ID: 3622374