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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。
Based on the investigation of secondary natural Pinus tabulaeformis forests in Funing County and Lulong County, this paper pointed out that because of unreasonable repeated seasons and pruning in recent years, most of the Ⅰ ~ Ⅱ age-class Pinus tabulaeformis forests have become small-diameter and dry Poor and sheltered soil with extremely low sparse stand. Pure forest also mixed forest, the same age forest also have different age forest. The forest has pine trees and oak trees, natural regeneration of saplings. In this paper, we discussed how to control the density of Pinus tabulaeformis plantation by using the standard of thinning preserved stands of Pinus tabulaeformis, and set up a reasonable standard of pruning. In particular, the measures of closing hillsides and afforestation should be taken to promote the natural regeneration of Pinus tabulaeformis forest.