红锥优质用材林间伐整枝与中期施肥试验

对红锥人工纯林开展间伐整枝和中期施肥试验研究,结果表明,间伐整枝或适量中期施肥均能有效提高林分生长量,不同程度地改善林分质量和林分结构,尤其是适当间伐整枝配合适量施肥效果最好,实施1年后林分平均树高、胸径和材积增量分别比间伐整枝、施肥的单项效应和对照林分提高37.0%～113.5%、50.0%～134.2%和36.8%～194.2%。此外,间伐整枝也明显改善了林分小气候环境。研究还表明,在红锥人工林高度郁蔽后（七年生左右）,间伐30%（伐去生长不良和干形较差的林木）并剪去保留木下脚枝和分叉枝（修枝高度为树冠长1/2）,同时配合每株沟施复合肥120g、尿素65g、氯化钾22g的方案是可行的,可进一步示范推广。

Experiment of Thinning Pruning and Medium-term Fertilization in Castanopsis Hystrix High-quality Timber Plantation

tudy on release-thinning and pruning and the medium-term fertilization in timber stands of Castanopsis hystrix was carried out.The results showed that thinning and pruning or appropriate medium-term fertilization could improve stands growth,the stands quality and structure in varying degrees.Proper thinning and pruning with moderate fertilization showed the best effect.The average tree height,DBH and volume increment raised by 37.0%~113.5%,50.0%~134.2% and 36.8%~194.2% than thinning and pruning,fertilization of the individual effect and control,respectively after one year implementation.In addition,thinning and pruning significantly improved microclimate environment of stands.The research also indicated that after the plantation high close canopy(7-year-old or so),the solution was feasible that 30% intensity thinning(cutting the non-performing and poor stem form of the tree)and pruning wood offal forked sticks and branches(pruning height was 1/2 of crown height),with application of compound fertilizer 120g,urea 65g and potassium chloride 22g at the same time.It was suggested that the method could be expanded furtherly.