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Ⅰ—455杨Populus euramericana(Dode)Guinier生长快,干形良好,尖削度小,树干增粗快,这些特性优于沙兰杨、Ⅰ_(214)杨等欧美杨类,在华北平原上是一个有良好前景的绿化用材树种。为了充分发挥它的速生特性,我们对其幼林阶段进行了生长节律的观测及施肥效应的研究。一、试验区自然条件试验区设在山东省茌平县苗圃。该地年平均气温13.2℃,绝对最高气温40.8℃,绝对最低气温-19.8℃,年降水量600毫米。土壤为粘壤质褐潮土,80厘米以上土
Ⅰ-455 Populus euramericana (Dode) Guinier grew fast, with good stem shape, small taper and thick stems. These characteristics are superior to those of European and American poplars such as Sallam, I_ (214) A good prospects of afforestation timber species. In order to give full play to its fast-growing characteristics, we observed the growth rhythm and the effect of fertilization on its young stage. First, the experimental area of natural conditions Test area is located in Chiping County, Shandong Province Nursery. The annual average temperature of 13.2 ℃, the absolute maximum temperature of 40.8 ℃, the absolute minimum temperature of -19.8 ℃, the annual rainfall of 600 mm. Soil is sticky loamy brown soil, 80 cm above soil