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白桦是冀北山区的一个主要成林树种,具 有分布广、生长快、材质好,抗旱、抗寒,喜 光喜肥,抗病虫害等许多优点。目前对于白桦 次生林的经营方式是抚育、改造、采伐利用。 对于采伐迹地,靠萌芽更新或人工引进针叶树 辅助更新。对实生幼树没有采取培育措施,也 没有提到经营的议事日程上来。实生白桦能否 更新?能否成林?就这个问题,作者在平山林 区内设置了28块临时性标准地进行调查。现将 调查结果报告如下:
Betula platyphylla is a major forest tree species in the north of Hebei Province. It has many advantages such as wide distribution, fast growth, good material, drought resistance, cold resistance, hi light hi, pest resistance and so on. At present, the management mode of birch secondary forest is tending, reforming and harvesting. For deforestation, rejuvenation or artificial introduction of conifers to update. No measures have been taken to nurture young saplings nor to mention the business agenda. Is it possible to update the actual birch? Can it be a forest? On this issue, the author set up 28 temporary standards in the Pingshan Forest Area to conduct a survey. Now report the findings as follows: