米槠林林下套种三尖杉人促更新效果分析

The Man-promoted Regeneration Effect of Cephalotaxus fortunei interplanted under Castanopsis carlessi Forest

在米槠林中进行不同强度间伐后套种三尖杉的人促更新试验。结果表明:米槠林间伐后,在林下套种三尖杉可以构建层次明显,较为复杂的林分结构,且对上层米槠生长、培育较高规格材种有明显促进作用,与不间伐、不套种ACK处理比,平均胸径增加14.3~30.5%,平均树高增加18.4~30.5%。;以A-3处理(间伐后保留上层木450株/hm^2)林分郁闭度在0.47左右,林下三尖杉生长较好;坡向、坡位、坡形以阳坡、中下部、凹形区生长优于半阴坡、中上部、凸形区;经方差分析A-3、A-2、A-1处理与ACK处理,A-3与A-1处理,单株材积间差异达到极显著水平,A-3处理与A-2、A-1处理,A-2、A-1处理与ACK处理单株材积间差异达到显著水平。米槠三尖杉复合林分中米槠单株材积明显增长,有利于培育米槠大径材,且保育了一定数量具有用材和景观价值的三尖杉。

The man-promoted regeneration effect of Cephalotaxus fortunei interplanted under different density intermediate cutting of Castanopsis carlessi forest was studied. The results showed that after C. carlessi intermediate cutting, C. fortunei interplanted under the forest could construct a distinct layer and complicated stand structure, and obviously promote the upper layer forest of C. carlessi to be high specification wood. Compared with the none intermediate cutting and none interplanting（ACK）, the average DBH and height increased 14.3-30.5% and 18.4-30.5%, respectively. C. fortunei forest grew best using the A-3 treatment（upper layer 450 individuals/hm^2 after intermediating） and under the density of around 0.47.The trees on sunny slope, middle and low slope position, and concave zone grew better than that of semi-shady slope, middle and low slope position, and convex zone, respectively. The results of variation analysis showed there were great significant difference between A-3, A-2 or A-1 and ACK treatment in individual volume, as well as A-3 and A-1; there were significant difference between A-3 and A-2 or A-1 treatment in individual volume, as well as A-2, A-1 and ACK. The individual volume of C. carlessi in the multi-storey forest of C. fortunei and C. carlessi increased obviously, which was good for cultivating big diameter timber, and raised a number of rare species C. fortunei with the value of timber and landscape.