【摘要】 总结了美国中南部密西西比州等4州44个悬铃木种源在安徽黄山育苗试验的结果。结果表明:在黄山的地理、气候条件下,苗期生长迅速,当年苗高可达92.5cm,地径0.75cm,表现出较好的速生性能。幼苗叶片对低温、初霜的生理反应有明显差异,但主梢、侧枝均无受冻现象,表明各种源都具有较强的抗寒性,适宜在我国亚热带地区引种栽植。种源间苗高、地径生长量差异均达显著以上水平。苗高、地径生长快的悬铃木优良种源,多分布于美国中南部纬度偏低、经度偏高的地区,其中优于均值的阿拉巴马州L 2 10 21#、路易斯安那州F 1 08 21#、密西西比州B 1 10 29#和I 2 02 20#4个种源可作为我国亚热带地区引种的初选优良种源。更多还原

【Abstract】 This paper summarizes the experiment of growing seedlings which 44 seed sources of(P.occidentalis L.) from 4 states like Mississippi are situated in the middle south of America.The test shows that the growth during the seedling stage is rapid under the geographic and climate conditions of Huangshan area.The height of seedling can reach 92.5 cm in the same year,and the ground diameter can reach 0.75 cm,which presents rapid feature.The tender leaves have obviously distinctive reactions to a low temperature and the first frost,while trunks and lateral buds have not been affected by the cold weather,which demonstrates that different varieties of provenances have strong resistance to the cold and can be adapted to growing in the tropical areas in our country.The difference in the seedling height among the provenances as well as in the growth of the ground diameter has reached a certain level.The excellent provenances of the P.occidentalis L.which have the characteristics of high seedling and quick growth of the ground diameter,are distributed over the area of the lower latitude and the higher longitude in the middle south of America.Among these sources, the Alabama’s L21021#, the Louisiana’s F10821#,the Mississippi’s B11029# and T20220# are superior to the average value,which can be the first to be selected as excellent provenances in the tropical areas in China.更多还原