关键词: 机械处理, 出根率, 萌芽率, 种子, 房山栎, 夏栎

Abstract: The germination delay and irregulation of Quercus seeds affect the seedling quality and growth. In this study we investigated effects of different mechanical treatments, including removing cup scar (RS), removing pericarp (sound cotyledon) (RP/SC), removing pericarp and cutting off 1/2 cotyledon (HC), removing pericarp and cutting off 2/3 cotyledon (TC), on seed germination and seedling growth of Q. ×fangshanensis and Q. robur. The results showed that 1) both species had characteristics of delayed and irregular germination and emerged roots without shoots; 2) compared with untreated control(CK), RP, HC and TC significantly shortened the root and shoot mean germination time of Q. ×fangshanensis and Q. robur seeds, and increased root and shoot synchronization index and vigor index; RP and HC could significantly increase seed rooting and germination percentage, root length and shoot height, and TC significantly promoted the seed rooting and shooting germination percentage compared with CK, however, the root length and shoot height with TC treatment had no significant difference from CK; 3) compared with sound cotyledon, cutting off too much cotyledon (2/3) remarkably decreased seed rooting and germinating percentage; 4) removing cup scar significantly decreased the root length and shoot height, mean germination time, however, no siginificant difference was detected on the root and shoot synchronization index, germination percentage and vigor index between RS and CK. Thus, RP and HC can effectively accelerate germination and uniform seedlings, which has an important practical significance in Q. ×fangshanensis and Q. robur seedlings.

Key words: mechanical treatments, rooting percentage, germinating percentage, seeds, Quercus×fangshanensis, Quercus robur