摘要
种子作为木本植物或灌木树种的主体,在群落更新中起着重要作用。充足的良好种源是物种天然更新成功所必须具备的条件之一,而一个物种的种源多少是由种子生产、种子雨密度、种子库动态决定（Simpson,1989）。
This experiment was conducted to study densities and spatial distribution of seed rain and soil seed bank of endangered plant Amygdalus mongolica at different altitudes between 2008 and 2009 in Baotou,Inner Mongolia.Self-renewal abilities and effect of changes in the micro-habitats on A.mongolica populations were analyzed.The purpose is to provide reference information for protection and reconstruction of A.mongolica populations.The results showed that the seed rain density changed obviously,while the soil seed bank density did not change significantly in the inter-annual.Seed rain mainly distributed around the shrub crown within 2 m,and the horizontal distribution was relatively narrow.The soil seed bank mainly distributed in the litter layer of 1.50 m circumference section around the parent tree,in which it was not conducive to seed germination.There existed more significant differences in the seed rain and soil seed bank at different altitude zone（P0.05）,which showed a decreasing trend with the elevation increased.The correlation analysis showed that,seed rain densities had a significant negative correlation（P0.05） and soil seed bank densities had even a more significant negative correlation（P0.01） with altitude gradient.Therefore,altitude would be the most important factor that determines the seed rain and soil seed banks.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2012年第10期145-149,共5页
Scientia Silvae Sinicae
基金
内蒙古自然科学基金项目(2009BS0506)
内蒙古人才开发基金资助项目
关键词
蒙古扁桃
种子雨
土壤种子库
海拔梯度
Amygdalus mongolica
seed rain
soil seed bank
elevation gradient
