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引入的国外优良树种只有栽植在立地条件与原产地相符或基本一致的地方,方可发挥良种优势,这是因为良种的生物学和生态学特性,是在原产地立地条件下经长期的自然与人工选择形成的。虽然引入的良种也可以驯化,但需要时间。立地条件包括地理区域与土壤条件两个部分,地理区域主要是气候与地貌因素所决定的,集中反映了林木生长的水热条件;土壤条件是指土壤的理化和生物特性对于具体树种的宜林性。本文就六十年代引入的I-214
The introduction of foreign fine tree species planted only in the site conditions consistent with or consistent with the original place, can play a superior seed, it is because of the biological and ecological characteristics of elite, is based on the site of origin after long-term natural and Formed by manual selection. Although introduced seeds can also be domesticated, it takes time. Site conditions include two parts of geographical and soil conditions, the geographical area is mainly determined by climate and landform factors, and focus on reflecting the water and heat conditions of forest growth; soil conditions refers to the soil physical and chemical properties and biological characteristics of the appropriate tree species Sex. This article introduced the I-214 in the 1960s