不同培育周期米老排苗木造林效果分析

通过铺设培育周期为6 和12 个月的两种米老排（Mytilaria laosensis）实生苗( 简称I 和II 类苗) 对比试验和调查造林保存率、母株和萌条生长指标，初步评价造林后8 个月米老排幼龄林的生长表现，为确定适宜的苗木培育周期和选择合适的苗木规格提供参考。研究结果表明： I 类苗的造林保存率、母株地径和高度均显著大于II 类苗，两者间的保存率、母株地径和高度的差值分别为13.8 个百分点、0.60 cm 和0.41 m；不同培育周期的苗木对造林后萌条生长无显著影响，优势萌条地径和高度以及萌条平均地径和高度分别约为1.0 cm、1.0 m、0.8 cm、0.8 m，而萌蘖率和萌蘖数均分别超过93% 和2.5 株穴-1；I 类苗造林后80% 以上的母株生长高于优势萌条，而II 类苗造林后母株生长高于优势萌条的比例约占一半；母株地径与萌条生长指标相关性均不显著，而母株高度与优势萌条高度和萌条平均高度的相关性达到显著水平；总体上，采用培育6 个月的实生苗造林，有利于促进新造米老排幼龄林的生长。

Preliminary Analysis on Afforestation Effect of Mytilaria laosensis Seedlings Cultivated for Different Period

Growth performance of 8-month-old plantation of Mytilaria laosensis was preliminarily evaluatedby comparing two types of seedlings (Type I and II were cultivated for six and twelve months respectively) andinvestigating preservation rate, the growth index of mother plants and suckers, in order to provide referencesfor determining suitable seedling cultivation period and selecting appropriate seedling specifications for theafforestation. The results showed that the preservation rate, the diameter and height of mother plant of type I weresignificantly higher than those of type II, and the difference of preservation rate, mother plant diameter and heightbetween two types were 13.8%, 0.60 cm and 0.41 m, respectively. Different types of seedlings had no significanteffects on the growth of suckers, and the diameter and height of dominant sucker, the average diameter and heightof suckers were about 1.0 cm, 1.0 m, 0.8 cm and 0.8 m, respectively; The suckering percentage and sucker numberof both types were more than 93% and 2.5 plants clump-1, respectively; over 80% of mother plants grew higherthan dominant suckers after planting with type I seedlings while about half of mother plants did better than thoseafter planting with type II seedlings; the correlation between the diameter of mother plants and the growth indexof the suckers was not significant, but that between the height of mother plant and the height of dominant suckerand the average height of suckers reached a significant level. On the whole, the seedlings cultivated for six monthswere beneficial to promote the growth of newly-established plantation of M. laosensis.