【摘要】 通过对引进的3个家系美国东部黑核桃4-5年生幼树的年生长节律及物候分析比较,结果表明:(1)黑核桃春季萌动、抽梢生长较晚,生长期仅为80 d左右,高、径生长集中在5-7月;(2)为使新梢充分木质化,预防2次生长带来的早、晚霜危害,树木停止高生长后,及时有效控水;(3)同一种源不同家系间,高、径生长存在差异,引进种子苗木时,应考虑引进经过区域试验种源的优良家系。更多还原

【Abstract】 Annual growth rhythm and phenology of the saplings of 4-5 years old from 3 families of eastern American black walnut introduced were analyzed and compared with each other. The results showed that black walnut germinated and sprouted more lately in spring, the growth period only last about 80 days, and the height and diameter were increased mainly from May to July. In order to promote full lignification of new shoots and prevent the damage of early and night frosts to new shoots during the second growth, irrigation should be controlled effectively in time after the growth of height stop. Growth of height and diameter were different between different families from the same provenance, so excellent families which had gone through regional test should be considered as seedlings introduced.更多还原