在对平泉大窝铺小鹰窝沟等处更新良好的天然油松林进行调研后认为 :阳坡油松林在 4 0 a左右达到更新成熟。在此期间对林地进行刈草和块状整地 ,造成裸露、疏松和凹凸不平的微地形 ,并在种子半年实行渐伐、择伐或强度间伐 ,保留郁闭度在 0 .3～ 0 .6 ,可获得满意的更新效果 ,此结论将对承德市 6万余公顷人工油松林的更新提供有益的启示 The survey on the well-developed natural Pinus tabulaeformis forest at Xiaoying dimple in Pingquan Dawei shop concluded that the Pinus tabulaeformis forest reached a maturity of maturity around 40 days. In the meantime, mowing and massaging the forest land resulted in nudity, looseness and uneven microtopography. Six months of seed-cutting, selective cutting or intensity thinning were carried out. The closed canopy density ranged from 0.3 to 0.6, This result will provide a satisfactory enlightenment to the renewal of more than 60,000 hectares of artificial Chinese pine forests in Chengde City