木荷人工林经营效果分析

对木荷人工林经营效果的研究结果表明:木荷适应性强,对立地条件要求不严,但应优先选择Ⅰ、Ⅱ级立地的中下坡造林较好。木荷适宜营造混交林,纯林生长缓慢,难以培育大径级用材林。人工林经营应严格控制经营密度,适时间伐,20年生后木荷经营密度不宜大于975株.hm-2。在一定的密度范围内,木荷的胸径、树高、材积生长随混交比例的增大而下降,树种组成以4荷6杉较为合理。在同一立地营造的荷杉混交林的蓄积量和土壤肥力均大于木荷纯林。

The management effects of Schima superba plantation

The analysis of the management effects of Schima superba plantation showed that S.superba had comprehensive adaptability without rigorous site conditions,but prefer to middle and downslope of the site level Ⅰ and Ⅱ;it was suitable for mixed forest rather than pure one which grew slowly and was difficult to become big diameter timber.Its plantation needed to control the density,the proper thinning time,i.e.its density should not be over 975 individuals·hm-2 after 20 years.Within the given density,its DBH,tree height and volume increment decreased along with the increase of the mixed proportion,and the optimal ratio of S.superba to Cunninghamia lanceolata was 4∶6.At the same site condition,the volume and soil fertility of the mixed forest of S.superba and C.lanceolata were higher than that of the pure one.