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通过种子分级播种、控制苗木密度、生长期切根与剪顶等综合性的试验研究 ,使马尾松大田苗达到了优质苗的质量指标 :(1)每公顷产优质苗 10 0～ 12 0万株 ,I级苗率达 80 %以上 ;(2 )苗木茎干粗壮 ,高径比为6 0～ 70 ;(3)苗木根系发达 ,冠根比为 4～ 5 ;(4)苗木须根数量多 ,菌根感染率高。在相同的田间管理条件下 ,所采用的 4项技术措施 ,对培育大田优质苗各有相应的促进作用 ,其中以切根技术尤为突出。切根苗的高径比与冠根比均在壮苗的适宜范围内 ,须根数量多、菌根感染率高 ,均明显优于未切根的普通大田苗 ,这将有效地提高造林质量
By seed sowing, control of seedling density, growth and root cutting and cutting the top of the comprehensive experimental study of Masson Pine seedlings to achieve high quality seedlings quality indicators: (1) per hectare produce high-quality seedlings 10 0 ~ 120 000 (2) the stalks of the seedlings are sturdy and the height-diameter ratio is 60 ~ 70; (3) the root system of the seedlings is developed and the crown-root ratio is 4 ~ 5; (4) , Mycorrhizal infection rate is high. Under the same management conditions in the field, the four technical measures adopted have the corresponding promoting effect on nurturing high-quality seedlings in the field, among which the cutting technology is particularly prominent. The height-diameter ratio and crown-root ratio of cut rooted seedlings were both within the suitable range of strong seedlings, with more fibrous roots and higher mycorrhizal infection rates, which were significantly better than those of un-cut rooted common field seedlings, which would effectively improve the plantation quality