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选择苗干高3.6厘米以上、无病虫害、无机械损伤的优质壮苗作插干。一般在意杨苗大量落叶至萌芽前,自平地截取,不留高桩,截面要求光滑平整。选留的优质插干应修除侧枝,并按干粗0.5厘米一个级差进行分级。然后按每20株或30株打捆,放于河中或池塘中浸泡3~7天。应选择地下水位在1.5~3.0米之间,沙壤、轻沙壤的地栽植。一般在2月至3月上旬,打深60-80厘米的洞定植。为保证苗干与土壤的紧密结合,插干前可用稀泥浆灌洞或用水直接灌洞,然后插入苗干,轻摇几下,就近铲土并踏实洞口。
1、本种不可在我国东北、华北、西北及长江流域,南方热带地区才能种植。
2、由于意杨树冠扩展大,整体树形圆柱状。株行距一般可为3×5米以上,这种密度生长出来的树,一般较笔直,成材率高。成材因管理及需求而异,可为8~10年后再伐。
3、意杨不能一直浸泡在水中生长,这会腐烂根系,导致全株枯死。
落叶大乔木,树冠长卵形。树皮灰褐色,浅裂。叶片三角形,基部心形,有2-4腺点,叶长略大于宽,叶深绿色,质较厚。叶柄扁平。
生长快速,树杆挺直。阳性树种。喜温暖环境和湿润、肥沃、深厚的沙质土,对杨树褐斑病和硫化物具有很强的抗性。
原产意大利。我国1 958年从东德引入,1965年又从罗马尼亚引入,1972年再由意大利引进。
用集装箱密集繁殖白杨树
匈牙利的林业专家研究出一种用集装箱密集繁殖白杨树的方法,良种白杨树可以用无性繁殖的方法培育根系。放入集装箱的压条周围堆上泥炭和珠光石,集装箱周围开一些孔,从孔里可以看见压条。这种集装箱苗圃具有与温室一样的条件,营养期结束后,从箱里取出压条。采用这种方法一根压条能长100~150条树根,而传统方法只能长10~15条树根。
南方地区杨树胶合板材定向培育技术的研究
Based on the results of more than ten year's scientific research and practice, some key techniques for cultivating poplar veneer glued wood were summarized systematically. The results were as follows: (1)Selecting appropriate poplar clones for various cultivation zones according to their growth rate and wood quality. (2)Choosing good sites being suitable for poplar clone growing (at least SI≥18?m). (3)Adopting reasonable planting density which can produce more timbers to meet the need of plywood(the tree spacing should be more than 5?m×5?m). (4)Using correct planting methods for different soil conditions, however, large seedling with 2 year old root and 1 year old stem (seedling height>4?m)were advocated. (5)Taking effective measures to tend the stand, the most effective measure was interplanting with crops. (6)Pruning was neccessary to produce non node timber, but pruning method, pruning intensity and pruning season should be controlled properly. If the 6 measures mentioned above were carried out, the poplar forests with a high yield and high quality could be ensured. In order to provied some theoretical basis for cultivating poplar veneer glued wood, 4 optimum cultivation patterns were also established using the method of two dimensions system.