tailieunhanh - Báo cáo lâm nghiệp: "Seasonal fluctuation in germination of short and longterm stored Norway spruce"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Seasonal fluctuation in germination of short and longterm stored Norway spruce . | JOURNAL OF FOREST SCIENCE 54 2008 9 389-397 Seasonal fluctuation in germination of short and longterm stored Norway spruce Picea abies L. Karst. seeds G. Debnárová1 E. Smelková2 1 Centre of the Control of Forest Reproduction Material Liptovský Hrádok National Forest Centre Zvolen Slovakia Faculty of Forestry Technical University in Zvolen Zvolen Slovakia ABSTRACT Routine laboratory testing is done throughout the year to determine the quality of forest seeds. This raises the question of how the results are affected by possible seasonal effects on germination energy and germination capacity of seeds. To answer this question fluctuations in germination energy GE and germination capacity GC of Norway spruce Picea abies L. Karst. seed was determined throughout the year. The test seeds had been stored for either a short time 2 months and 1 year or a long time 12 and 13 years . Seed testing was done according to ISTA rules two times in the first year T1 and the second year T2 in each month during a year. Ten seed lots from five Norway spruce seed zones in Slovakia were used for each treatment. Obtained data were processed by analysis of covariance independent factors - T and months covariate - altitude of seed origin . The monthly germination indicators were compared to annual average using absolute differences and relative seasonal indexes . The results showed that GE and GC of short-term stored seeds were 59 and 92 and 35 and 81 for long-term stored seeds. Compared to the annual average the monthly germination indicators fluctuated very differently for GE three times more than for GC for long-term stored seeds 2-3 times more than for short-term stored seeds. For GE significant deviations were found in six months during a year in the range 11-23 for both variants of seed storage. In contrast for GC values such deviations were confirmed only for short-term stored seeds in February and March but the differences -2 were very small and can be neglected. For use in forestry .