通过对引进的5个品种的美国薄壳山核桃幼树连续2年的树高与地径生长节律的测定比较，结果表明：美国薄壳山核桃高生长峰值出现在4、7月份，地径增长则分别出现在5、6、8月份；生长期可划分为生长前期、生长旺盛期、生长减缓期与生长基本停止期。不同品种薄壳山核桃不同生长阶段的高与地径生长量存在显著差异，全生长期内不同品种的高生长与地径生长量均随时间的延长而差异减小。不同品种间的高、径生长速率不同，赣选2号的月均高生长量最大，赣选1号较小；地径月均增长量则以赣选5号的较大，赣选1号的较小；引进薄壳山核桃苗木时，应考虑引进经过区域试验种源的优良品种。%The tree height and ground diameter growth rhythms of treelets of introduced five American pecan ( Carya illinoinen-sis Koch.) varieties were measured and compared for continuous 2 years.The results showed that the growth peak of American pe-can tree height appeared in April and July , and that of its ground diameter respectively turned up in May , June and August .The growth period could be divided into growth early stage , exuberant growth stage , slow growth stage , and growth basic stop stage . There were significant differences in tree height and ground diameter increment at various stages among five American pecan varie -ties, but these differences all decreased with the advance of their growth and development .The growth rates of tree height and ground diameter among five varieties were different .The average monthly tree height growth of pecan variety Ganxuan No .2 was the most, while that of Ganxuan No.1 was the least.The average monthly increment in ground diameter of Ganxuan No .5 was the most, and that of Ganxuan No .1 was the least.So the excellent pecan varieties which have gone through regional test should be considered as the introduced seedlings .
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