对杉木(Cunninghamia lanceotata(Lamb.)Hook.)人工林进行4种不同强度择伐作业,分别为弱度12.9%、中度23.5%、强度46.1%和极强度64.6%,分析不同强度择伐5 a后对植被、土壤和凋落物的影响。结果表明:与未采伐相比,林分平均树高、平均胸径、蓄积量和断面积均随择伐强度增大呈先增大后减小的趋势;林下灌木和草本的物种多样性指数均增大;0~20 cm土层土壤密度、水分、孔隙状况和养分状况,均得到一定程度的改善;强度择伐下林地凋落物现存量及其养分总量均最大。综合比较得出,强度择伐5 a后林地生态环境的综合改善效果较佳,更适宜南方山地杉木人工林的科学经营与管理。
This study focused on the ecological effects of different selective cutting intensities in Chinese fir plantation.Four kinds of treatments were set up with selective cutting intensities,including low selective cutting intensity of 12.9%,medium selective cutting intensity of 23.5%,high selective cutting intensity of 46.1%,over-high selective cutting intensity of 64.6% and control without selective cutting.Effects of different selective cutting intensities on the vegetation,soil,and litter were investigated and analyzed five years later.Compared with the control,the results indicated that the mean height,the mean DBH,volume and basal area increased and then decreased with increasing of selective cutting intensity.The species diversity of shrub and herb layers under forest communities increased.The soil density,soil water content,soil porosity condition and soil nutrient status from 0~20 cm soil layers were improved in some degree.Total nutrient content of litter in plantation land with high selective cutting intensity reached the maximum.According to comprehensive comparison,the improvement of comprehensive effect on forest ecological environment was preferable with high selective cutting intensity.So it was more appropriate to be used for the scientific operation and management of Chinese fir plantation in mountainous areas in South China.
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