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白桦(Betula platyphylla Suks)次生林在我省分布为数不少。据统计,其蓄积约占我省森林总蓄积的16.8％。可见其在森林经营中所应占的地位。我们综合以往调查资料,研究分析其生长特性,试图对我省桦木生产的合理布局和经营管理等方面提出一些看法。一、分布状况白桦是喜光、喜酸性土壤的树种,耐瘠薄严寒,适应性强,分布广,易在针叶林采伐迹地上更新,常见与山杨伴生,堪称北方次生林区的“姐妹”树种,白桦是其中的先锋树种之一。按我省植被分区分类系统看,白桦次生林的分布范围主要属于暖温带落叶
Betula platyphylla Suks secondary forest in our province a large number of distribution. According to statistics, its accumulation accounts for about 16.8% of the total forest reserves in our province. We can see its position in the forest management. Based on the previous survey data, we studied and analyzed its growth characteristics and tried to put forward some opinions on the rational layout and management of birch production in our province. First, the distribution of the birch is hi light, Hi acidic soil tree species, resistance to infertile cold, adaptable, widely distributed, easy to cut in the coniferous forest regeneration, common with the aspen, called the northern secondary forest “sisters” Tree species, birch is one of the pioneer tree species. According to the division of vegetation classification system in our province, the distribution of secondary birch secondary forests mainly belong to warm temperate deciduous