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湿地松(Pinus elliottii Engelm),原产北美南部。我所1948年引种4,000余株,1960年起作为母树林经营,经过几次疏伐,现保留母树1,530株。1960年开始结实,历年收到的种子,已繁育栽植湿地松林1,050亩。建立湿地松母树林,是一项新的工作,根据我们十多年来的实践经验,现对营建技术提出如下意见,供参考: 一、林地选择母树林是培育优良母树,提供优质种子的林分,要求有较好的立地条件。林地选择是否适宜,将直接影响母树林的生长和种子的产量和质量。特别是湿地松为外来树种,因此选择林地时要注意下列几点:
Pinus elliottii Engelm, native to southern North America. I introduced more than 4,000 plants in 1948 and operated as mother trees in 1960. After several deforestation, 1,530 mother trees are now kept. The seed that began to be strong in 1960 and received over the years has been planted to plant 1,050 mu of wetland pine forest. The establishment of wetland pine woods is a new job, based on our more than 10 years of practical experience, the construction technology is now on the following views for reference: First, woodland selection is to cultivate a good parent tree, to provide high-quality seeds of the forest Points, require a better site conditions. The suitability of woodland selection will directly affect the growth of parent woods and seed yield and quality. In particular, pine is exotic species, so when you choose forest land should pay attention to the following points: