河北省园林绿化用白皮松苗木质量分级标准研究

Study on the Grading Standards of Seedling Quality of Pinus bungeana Zucc. for Landscaping in Hebei

针对河北省白皮松苗木生产现状,对石家庄、保定、邯郸、邢台、廊坊、唐山等地的苗圃进行了抽样调查,测定了苗木地径、苗高、冠幅、最大半冠径、最小半冠径、侧枝数量(大于30 cm)、根球横径及纵径、断根数量(≥0.5 cm)等数值,计算了树冠饱满度、偏冠度、枝条的疏密度,取得了苗木的各项数据。在正态性检验的基础上,对数据进行方差齐性检验和差异显著性检验,再根据正态总体参数估计理论,按95%的可靠性,计算出树冠饱满度、偏冠度、枝条的疏密度分级的理论临界值;最后结合苗圃生产实际,对各理论临界值分别进行适当调整,分量化指标和综合控制指标确定最终的苗木质量分级标准。

Based on seedlings production of Hebei Pinus bungeana Zucc,the nursery in Shijiazhuang,Baoding,Handan,Xingtai,Langfang,Tangshan was sampled and surveyed.The ground diameter,seedling height,crown,the biggest half crown,the smallest half crown,collateral quantity,ball diameter and longitudinal diameter,broken root quantity were measured.The crown plumpness,partial crown degree and branches porosities were calculated.All data of seedlings were obtained.Based on normal test,the data’s variance and significant test of difference were made.Based on the normal general index estimation theory,according to 95% reality,the theatrical critical value of crown plumpness,partial crown degree and branches porosities were calculated.Lastly,combining with nursery actual production,every theoretical critical value was adjusted.The final grading standards of seedlings quality were defined according to quantitative index and comprehensive control index.