地形对滇西北高山松火烧迹地更新的影响

通过分析地形因子与幼苗发生时间、密度、生长状况的相关关系得出：地形因子对高山松火烧迹地更新影响明显，坡向、坡位对幼苗发生密度有影响，坡度会影响幼苗发生时间，海拔对幼苗发生密度有微弱影响。根据高山松火烧迹地更新随地形因子变化规律给出了合理化建议，火烧迹地更新方式不易大面积采用，仅为下坡及地势平缓地带易采用火烧迹地更新方式。

Impact of Topography on Regeneration of Pinus densata on Fire Slash Site in Northwest Yunnan Province

The correlations of topographic factors of the fire slash site to the germination, density and growth status of the Pinus densata seedlings in northwest Yunnan Province were studied. The results showed that the regeneration of P. densata on the fire slash sites was significantly influenced by the topographic factors. The aspect and the position on the slope had effect on seedling density, the gradient of the slope affected on the seedling germination time, while the elevation factor had a weak effect on seedling density. It was proposed that fire slash site regeneration of P. densata should be adopted conditionally, which should be applied only on the downhill sites or in the flat sites.