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在北亚热带江苏南京郊进行邓恩桉和冈尼桉两个耐寒桉树的引种试验,苗期研究表明,夏雨型种邓恩桉播种后出苗较快,3月中旬播种,一般10天开始出苗,20天时苗木基本出齐;冬雨型种冈尼桉播种后出苗较迟,一般20天才开始出苗,40天时苗木基本出齐。两种桉树苗术前期生长较慢,100天时,邓恩桉平均苗高16.4cm,冈尼桉仅5.1cm。邓恩桉干7月开始速生,8月呈现峰值,至11月下旬逐渐停止生长。1年生苗平均高1.63m,最高可达2.5m。冈尼桉不适应南京地区夏季高温,在遮阳网覆盖遮荫降温条件下,7月份陆续死亡。邓恩桉对低温有明显的适应性,在冬季—7℃自然低温下,仅叶片边缘及少量嫩芽出现轻度寒害,显示出引种潜力。
In the northern subtropical Jiangsu Nanjing suburb of Dunn Eucalyptus and Eucalyptus Dunn two cold-resistant eucalyptus introduction test, seedling studies have shown that the summer rain species Dunn Eucalyptus seedling emergence faster, sowing in mid-March, generally 10 days began to emerge, 20 days seedlings Basically homogeneous; winter rain type Eucalyptus eucalyptus emerge later after planting, usually 20 days to start emergence, 40 days when the seedlings basically Qi Qi. The two eucalyptus seedlings preoperative growth is slow, 100 days, Dunn Eucalyptus average height of 16.4cm, Eucalyptus Gaitian only 5.1cm. Dunn Eucalyptus began fast growing in July, peaked in August and gradually stopped growing in late November. One year old seedlings average high 1.63m, up to 2.5m. Gunnian eucalyptus does not meet the summer high temperature in Nanjing, shading in the shade cover cooling conditions, one after another in July died. Dunn Eucalyptus obvious adaptability to low temperature, natural low temperature in winter -7 ℃, only the edge of the leaves and a small amount of buds appear mild cold injury, showing the potential for introduction.