摘要
本文通过对抚宁县、卢龙县境内的天然次生油松林的调查研究指出,由于近年来不合理的反复择伐和整枝,多数Ⅰ～Ⅱ龄级的油松林已成为径级小、干形不良和庇护土壤能力极低的稀疏林分。有纯林也有混交林,有同龄林也有异龄林。林内有油松和栎树的天然更新幼树。文中论述了用油松林疏伐保留株数标准控制油松林密度问题,并制定了合理整枝标准;特别强调对油松林应采取封山育林措施,促进油松的天然更新,变疏林为密林。
The investigation on the natural secondary stands of Chinese pine was made in Funing and Lulong counties.Having been recieved unreasonal and frequent selection cuttings and excessive prunings in the past few years, most of theChinese pine stands in 1 to 2 age-classes seriously deteriorated. Their stand density drastically reduced and could not protect soil from erosion as well as before, tree diameter class became smaller, and bole form worse.In the stands, pure and mixed even-aged and uneven-aged of Chinese pine and oak, their saplings were found by and large enough for regeneration.The authors suggested to maintain the density of CMense pine stands by using ' the reserved stemnumber standard for thinning Chinese pine stand' , They also laid down a standard for reasonable pruning. Furthermore, it is particularly emphasized that closing mountains to human activities is a realistic and effetive way to promote regeneration of Chinese pine, and to increase stand density.
关键词
油松
天然更新
疏伐
封山育林
Chinese pine
natural regeneration
thinning
stand struction
