百合引种栽培的初步研究

The planting experiment on introducing 18 lily cultivars to Huangshan Region, Anhui Province was made by observing growth height, flowering property,and other growth indexes.The result showed that most of 18 cultivars could grow and flowering normally and was easily to be planted in the local climate.Five cultivars—Cascade and Sempre-Avanti of Eastern strains,Roma,Cordelia and Prato of Asia strains had proper flower numbers,good flower color,no flower abscission,and proper height,suitable for cultivating as fresh cutting flowers;Eight cultivars—Mediterrannee,Siberia,Miami,Berlin and Cheny-Blossom of Eastern strains and Alaska,London, and Geneve from Asia strains had proper flower numbers and good flower color without flower abscission, but low height,which were suitable as potting flowers and ornamental flowers for garden;Three cultivars—Bergamo of Eastern strain,Prato and Elite of Asia strain had bad flower shape,serious flower abscission,and low ornamental value,so they still needed further study when introduced;and 2 cultivars—Navona and Coral-Fashion of Asia hybrid strains couldn’t grow and flower,so they were unsuitable for planting in the local climate.

毛竹实生苗造林基肥种类比较研究

用复合肥、钾肥、磷肥及饼肥4种不同基肥进行毛竹实生苗造林试验,连续3年对其各项生长指标进行观测调查,结果表明:4种不同基肥对毛竹实生林生长均有明显的促进作用,其中第1年和第3年生长效应较弱,第2年效应明显,竹冠幅、地径、竹高等指标差异显著。主要生长指标均大于对照,不同基肥种类对毛竹生长的影响有较大差异,其中复合肥作用效果最好,钾肥作用效果最差。最后讨论了产生第3年后生长效应减弱的原因。

银鹊树的树种特性研究

在阐述银鹊树的生物学特性与生态学特性的基础上,重点分析了它的观赏价值,并对其繁殖方法进行了初步试验与探讨,为开发与利用银鹊树资源提供参考。

黄山地区竹类资源保护及其开发利用

黄山地区竹类资源丰富,有9属46种及变种、变形、栽培型,分布在黄山的全国特有属和种有4属5种,通过区系分析,合轴散生中型竹类占有首位。大部分竹类具有很高的经济价值或观赏价值,黄山地区竹类资源的开发利用具有广阔的前景。文内根据当地的实情提出了一些具体的保护及开发利用措施。

影响发动机配气相位变化的主要因素及预防措施

本文就发动机在使用、维修中,对配气相位变化产生影响的主要因素进行了分析,并提出了预 防措施。