湿地松(Pinus elltiotteii)原产美国东南部亚拉巴马州、佛罗里达州、佐治亚州、路易斯安娜州、密西西比州和西卡罗莱那州等。我国一九三○年首次引入美国湿地松。此后又四次大量引种。这几次引种的湿地松均为混合种,树木个体间生长量差异很大,而湿地松经美国林业科学工作者在本国进行地理种源试验,已证明种源间具有显著的遗传差异。为了进一步筛选湿地松优良种 Pinus elltiotteii native to the southeastern United States Alabama, Florida, Georgia, Louisiana, Mississippi and West Carolina and so on. Our country introduced the American pine slash for the first time in 1930. Since then introduced a large number of four. The introduced species of Pinus tabulaeformis are mixed species, and the growth of tree species varies greatly among individuals. However, the provenance of Pinus elliottii in the United States by forestry scientists in the United States has proved that there is a significant genetic difference between provenances. In order to further screen the Pinus elliottii species