柳樹苗定向培育優(yōu)質(zhì)造林壯苗的培育

怎樣培育香樟樹苗 樹又名香樟、 烏樟，樟科樟屬 Cinnamomum Camphoracl.)Presl. 喬木，樹高 50m.樹冠龐 大，呈廣卵形，樹皮幼時(shí)綠色，光滑，老時(shí) 灰褐色或黃褐色，不規(guī)則縱裂。葉互生，卵 形至卵狀橢圓形，長 6-12cm ，下面微被白 粉，離基三出脈，脈腋有腺點(diǎn)，圓錐花序生 于新枝葉腋，花小、淡黃綠色。果近球形， 徑 6-8cm ，熟時(shí)紫黑色?；ㄆ?4-5 月，果期 8-11 月，產(chǎn)于長江流域以南， 尤以臺灣、 福 建、江西、湖南最多， 喜光、稍耐蔭，喜溫 暖濕潤氣候，以深厚、肥沃、濕潤和微酸性 或中沙壤為付佳 。深根性，萌芽力強(qiáng)，壽命 長，耐煙塵，對二氧化硫、 臭氧有較強(qiáng)抗性。 以播種繁殖為主，也可以軟枝扦插或分蘗。 樟樹根深葉茂， 冠大蔭濃，是優(yōu)美的庭蔭樹、 行道樹、風(fēng)景林、防護(hù)林樹種。 可植于溪邊、 池畔、孤植、叢植于草坪、片植、群植作背 景樹。 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.