Seed Characteristics and Germination Properties according to Change of Cone Production in Pinus densiflora Stands

摘要

This study was carried out to obtain the several data for improving the seed supply in Pinus densiflora. Seed characteristics and germination properties according to change of cone production from 2003 to 2006 were analyzed in three plus stands of P.densiflora. P. densiflora showed good production at interval of two years in the periodicity of seed production. Seed potential and percent of filled seed (PFS) among the major seed characteristics showed positive relations to the change of cone production, whereas percent of developed seed (PDS) and seed efficiency showed opposite trend. As a result of regression analysis between seed characteristics and cone production, seed potential (R~2=0.682, p<0.01) and PFS (R~2=0.161, non-significant) presentedpositive correlation with cone production while PDS (R~2=0.418, p<0.05) and seed efficiency (R~2=0.308, non-significant) presented negative correlation. In germination properties percent of germination (PG) showed similar tendency to cone production, while mean germination time (MGT) showed opposite tendency. As a result of regression analysis between germination characteristics and cone production, PG showed positive correlation, whereas MGT showed negative correlation. Therefore, we could expect highgermination percentage and short period for germination when we harvested cones at good cone production time.