柳树苗定向培育优质造林壮苗的培育

怎样培育香樟树苗 树又名香樟、 乌樟，樟科樟属 Cinnamomum Camphoracl.)Presl. 乔木，树高 50m.树冠庞 大，呈广卵形，树皮幼时绿色，光滑，老时 灰褐色或黄褐色，不规则纵裂。叶互生，卵 形至卵状椭圆形，长 6-12cm ，下面微被白 粉，离基三出脉，脉腋有腺点，圆锥花序生 于新枝叶腋，花小、淡黄绿色。果近球形， 径 6-8cm ，熟时紫黑色。花期 4-5 月，果期 8-11 月，产于长江流域以南， 尤以台湾、 福 建、江西、湖南最多， 喜光、稍耐荫，喜温 暖湿润气候，以深厚、肥沃、湿润和微酸性 或中沙壤为付佳 。深根性，萌芽力强，寿命 长，耐烟尘，对二氧化硫、 臭氧有较强抗性。 以播种繁殖为主，也可以软枝扦插或分蘖。 樟树根深叶茂， 冠大荫浓，是优美的庭荫树、 行道树、风景林、防护林树种。 可植于溪边、 池畔、孤植、丛植于草坪、片植、群植作背 景树。 香樟的

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.