天然柄扁桃优树选择研究

对荒漠草原区和山地区2种不同条件下的天然柄扁桃生长状况进行调查,通过初选和复选,采用主成分分析法,确定了天然柄扁桃优树指标及标准。结果表明:荒漠草原区入选优树的标准为灌丛高≥1.42 m,平均单枝基径≥1.82 cm,平均单枝分枝长≥24.01 cm,种子长径≥11.50 mm,叶面积≥1.03 cm2,平均单枝分枝数≥16.00条;山区入选优树的标准为灌丛高≥1.61 m,总结实量≥663个,平均单枝分枝长≥25.42 cm,种子长径≥11.69 mm,千粒重≥354.16 g,平均单枝分枝数≥13.00条。

Selection of Plus Tree of Natural Prunus pedunculata

In this paper, the natural Prunus pedunculata in different site of desert - steppe area and mountain area were investigated. The index and standard of plus tree of natural Prunus pedunculata were determined by the meth- ods of preliminary selection, final selection and principle component analysis. The results show that in desert - steppe area, the standard for selection of plus tree was the shrub height ≥ 1.42 m, the average base diameter of single branch ≥ 1.82 cm, the average branch length of single branch ≥ 24. 01 cm, the length - diameter of seed ≥ 11.50 mm, the leaf area ≥1. 03 cm^2, the average branch number of single branch ≥16. 00 strips. In mountain are- a, the standard of selected plus trees is the shrub height ≥ 1.62 m, the total number of fruit ≥663, the average branch length of single branch ≥25.42 cm, the length -diameter of seed ≥11.69 mm, the thousand kernel weight ≥354. 16 g, the average branch number of single branch ≥13. 00 strips.