低效乔木林改为竹木混交林试验初报

大面积的低效林严重阻碍林业可持续发展。为探索将低效乔木林改为竹木混交林的适宜条件和措施，通过在低效乔木林中栽植楠竹，研究了林地坡向、林分郁闭度、林地清理方式、竹苗类型以及造竹密度对楠竹生长的影响。结果表明：最适宜楠竹生长的低效林郁闭度为0.3，采取带状劈割后，栽植楠竹原丛苗，造竹密度500丛/hm²；营建的林分第4年郁闭成林，第6年进入收益期，第7年新竹平均胸径达6.9 cm，竹子覆盖度为60%，竹木混交林状态基本形成。林地坡向对楠竹生长无影响，阳坡和阴坡均适宜于楠竹生长。

Preliminary Study of Low-efficiency Arbor Forest Improvement into Bamboo-Arbor Mixed Forest

Large-area low-efficiency forest has seriously impeded the sustainable forestry development. To explore the appropriate conditions and measures of improving low-efficiency arbor forest into bamboo-arbor mixed forest, the study analyzed the impacts of slope direction, stand canopy, land clearing mode, types of bamboo seedlings and afforestation density on the growth of Phyllostachys pubescens by planting this bamboo species in low-efficiency arbor forest. The result showed that the canopy of forests that were most suitable for Ph. Pubescens growth is 0.30, and after the splitting bush, the original clump-seedlings were planted with the density at 500 /ha; the stand went mature at the 4^th year and entered the harvesting period at the 6^th year, and when the 7^th year came, the new bamboo culms could reach the average diameter of 6.9 cm, and the bamboo coverage at 60%, which marked the formation of bamboo-arbor mixed forest. The slope direction had no impact on Ph. pubescens growth, and both sunny slope and shady slope were all suitable for its growth.