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在我国北亚热带江苏南京南郊进行邓恩桉和冈尼桉两个耐寒桉树的引种试验 ,苗期研究结果表明 ,夏雨型种邓恩桉播种后出苗较快 ,3月中旬播种 ,一般 10d开始出苗 ,2 0d时苗木基本出齐 ;冬雨型种冈尼桉播种后出苗较迟 ,一般 2 0d才开始出苗 ,4 0d时苗木基本出齐。两种桉树苗木前期生长较慢 ,10 0d时 ,邓恩桉平均苗高 16 4cm ,冈尼桉仅 5 1cm。邓恩桉于 7月开始速生 ,8月呈现峰值 ,至 11月下旬逐渐停止生长。 1a生苗平均高 1 6 3cm ,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月陆续死亡。邓恩桉对低温有一定的适应性 ,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
The introduction test of two cold-resistant eucalyptus dunnii and Eucalyptus globulus in the southern subtropics of southern Jiangsu province was carried out. The results of seedling stage showed that the summer rain-type species Eucalyptus dunnii emerged faster after sowing and sowed in mid-March, The seedlings were almost the same at the same time. The winter rain seedlings of E. giganteum seedlings appeared late after emergence, and generally began to emerge 20 days later. The early growth of two kinds of eucalyptus seedlings slow, 10d, Dunn Eucalyptus average height of 16 4cm, only 5 1cm Eucalyptus. Dunn Eucalyptus began fast growing in July, peaked in August and gradually stopped growing in late November. 1a seedlings average high 1 6 3cm, up to 25m. 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 has a certain degree of adaptability to low temperature. In winter, only slight frost damage occurred at the leaf edges and a few shoots at natural low temperature of 7 ℃, indicating the potential for introduction