【摘要】 通过3 a的野外调查与浇水、覆盖试验,分析了影响樟子松(Pinus sylvestris var.mongolica)天然更新的6个主要因子,即:气候特点、母树林郁闭度、种实、积沙层厚度、枯枝落叶层厚度、植被,特别是影响樟子松天然更新的主导因子。结果表明:章古台沙地樟子松天然更新是可能的;天然更新的樟子松在空间上呈带状、群团状分布,一般分布在母树树冠投影以外的东北方向;天然更新的樟子松年龄一般是不连续的,主要集中在年降水量大的年份,且每年的5、6、11、12月及翌年1月降水量显著影响着天然更新的樟子松数量;樟子松天然更新可分为林缘更新和林隙更新2种,更新密度一般为1 100～5 200株.hm-2,在无人为干预的情况下,林缘天然更新樟子松长势要好于林隙。应充分利用各种有利条件,进行天然更新和人工促进天然更新。更多还原

【Abstract】 Six factors,climatic characteristics,canopy closure of seed production forest,seeds,sand layer thickness,litter thickness and vegetation,affecting natural regeneration of Mongolian Scots pine(Pinus sylvestris var.mongolica),were analyzed through three years of field survey,watering and covering test.Results show that the natural regeneration of Mongolian Scots pine is feasible in Zhanggutai sandy land.The naturally regenerated seedlings were distributed in shapes of strip and clump,normally in the northeast of the mother trees.The ages of naturally regenerated seedlings were not continuously distributed,and natural regeneration mainly occurred in the years with plenty of precipitation.The number of regenerated seedlings was closely related to precipitation in May to June and November to January of the following year.There were two spatial patterns of the natural regeneration,namely regeneration in forest gap,and regeneration along the edge of plantation.The density of regenerated seedlings was 1100-5200 stems per hectare.The regenerated trees grew better along plantation edges than in forest gaps without artificial intervention.Therefore,we should make full use of favorable conditions for natural and artificial promoting regeneration of Mongolian Scots pine.更多还原