摘要
为阐明地被物对油松幼苗早期更新的影响,通过野外播种和室内控制试验,分析野外不同播种方式、不同凋落物厚度及凋落物水浸液浓度对油松种子萌发和幼苗早期生长的影响。结果表明:野外不同播种方式显著影响油松种子萌发率及幼苗生长状况,萌发率依次为清除灌木草本及凋落物>清除草本和凋落物>清除灌木和凋落物>清除灌木和草本,说明凋落物是影响种子萌发的主要因素;清除灌木草本及凋落物和清除灌木草本处理下幼苗高度、基径、根和茎生物量高于其他播种方式。1和2 cm厚凋落物对油松种子萌发没有显著影响,3 cm厚凋落物及先铺凋落物再播种均显著降低油松种子的萌发率及推迟种子的始萌发时间。不同浓度凋落物水浸液对油松种子萌发率和幼苗根长、茎长无显著影响。凋落物主要通过阻碍种子与地面的接触影响油松幼苗早期更新,合理地清理林下地被物能促进油松的天然更新。
To illustrate the effect of ground cover on early regeneration,seed germination and seedling growth of Pinus tabulaeformis under different sowing patterns were measured,with different litter thickness and different litter aqueous extracts treatments.The results showed that sowing patterns had significant effects on the seed germination and seedling growth of P.tabulaeformis,and the germination rate was in an order of clearing shrubs herbs and litters 〉 clearing herbs and litters 〉 clearing shrubs and litters 〉 clearing shrubs and herbs,indicating that litter was the major factor influencing the seed germination and seedling growth of P.tabulaeformis.The height,the basal diameter,the root and stem biomass of the seedlings under clearing shrubs herbs and litters and clearing shrubs and herbs were higher than other sowing patterns.The 1 cm and 2 cm thickness litters had no influence on the seed germination of P.tabulaeformis,but the 3 cm thickness litters and paving litters before sowing significantly decreased the germination rate of P.tabulaeformis seed and the beginning time of germination.The litter water extract had no significant influence on P.tabulaeformis seed germination and the early growth of seedlings.These results indicated litter affected the P.tabulaeformis early regeneration by physical obstacles,thus reasonable cleaning up ground cover can promote the natural regeneration of P.tabulaeformis plantation.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2014年第1期49-54,共6页
Scientia Silvae Sinicae
基金
"十二五"国家科技支撑计划(2012BAD22B0302)
关键词
播种方式
凋落物厚度
凋落物浸提液
种子萌发
幼苗生长
sowing patterns
litter thickness
litter water extract liquor
seed germination
seedling growth
