中文摘要：

调查四川省攀枝花市原始云南松林中的65个林窗,研究林窗的面积、年龄和开阔度对云南松更新的影响。结果表明：林窗干扰有利于云南松天然更新;小林窗中云南松幼苗更新密度最大,大林窗中云南松幼树及成树的密度较大;幼苗和幼树在幼年林窗中密度较大,而成树在老年林窗中密度最大;云南松幼苗密度随开阔度的提高而降低,幼树和成树的密度则增加;开阔度越大云南松个体也越大,但在开阔度低于0.6的林窗中,云南松更新困难;林窗和非林窗下云南松的重要值均排第1位,表明未来该研究区仍以云南松为优势种。

英文摘要：

The effects of gap size, gap age and canopy openness on Pinus yannanensis regenration were investigated with 65 gaps in virgin old-growth P. yunnanensis forest in Panzhihua, Sichuan Province. The results showed that gap disturbance promoted P. yunnanensis regeneration. Regeneration densities of seedlings peaked in small gap, while saplings and mature trees peaked in large gaps. The gap age also played a role, that is, seedlings and saplings density peaked in young gaps, and mature trees peaked in mature gaps. Canopy openness had significant effects on P. yunnanensis regeneration. Seedling regeneration density decreased with an increase of canopy openness, while saplings and mature trees increased with canopy openness broadened. P. yunnanensis of natural regeneration was stronger in gaps with large canopy openness, whereas it was difficult for P. yunnanensis to regenerate in gaps with low canopy openness （ 〈 0.6 ）. The P. yunnanensis were listed as the most importance value both in gaps and non-gap, indicating P. yunnanensis will be the dominant species in this area in the future.