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对陇县3个林场的美国黄松引种育苗、造林效果进行了调查研究。结果表明,美国黄松(Pinusponderosa)苗期生长量大于油松。八渡林场、龙门洞林场和陇县苗圃的黄松高生长量分别是油松的108.8%、105.5%和123%,陇县苗圃的黄松与油松有极显著差异,而且黄松苗木根系发达,适应性强。陇县八渡林场7a生美国黄松幼树,平均高为1.21m,平均地径生长量为3.69cm,与本地相同立地条件下生长的油松比较,树高生长量小12.4%,地径生长量大27.6%。与省内其他引种地比较,八渡林场黄松的高生长量明显大于榆林黑龙潭、延安树木园、麟游秦家沟和周至厚畛子等地。
The investigation on the introduction of seedlings and afforestation of Ponderosa americana in 3 farms in Long County was carried out. The results showed that P. pinuspondosa grew more in seedling stage than Pinus tabulaeformis. The growth of Pinus tabulaeformis, Longmen-dong forest farm and Longxian nursery was 108.8%, 105.5% and 123% respectively. The Pinus tabulaeformis and Pinus tabulaeformis in Longxian nursery had extremely significant differences, Strong adaptability. Compared with Pinus tabulaeformis grown in the same habitat in the local area, the average growth height of Pinus sylvestris var. Sativa was 7.12 m and the average diameter was 3.69 cm. Larger growth of 27.6%. Compared with other introduced areas in the province, the high growth of Pinus ponderosa in Baodu Forest Farm was significantly larger than that of Yulin Black Dragon Pool, Yan’an Arboretum, Linyou Qinjiagou and Zhouzhihou Bangzi.