【摘要】 14年生不同立地级杉木林间伐强度试验结果表明 ,间伐强度对不同立地级的杉木树高生长影响不显著 ,而杉木胸径、单株材积和经济出材率均随间伐强度提高而增加 ,单位面积蓄积量和总出材量均随间伐强度加大而减小。不同立地指数级 (1 6、1 8)以中度间伐经济效益最高 ,其次是强度间伐 ,对照最低。更多还原

【Abstract】 The experiment on the thinning intensity of 14-year-old Cunninghamia lanceolata forests with different site classes reveals that the influence of the thinning intensity on the height growth of C.lanceolata with different site classes is not significant;the dbh,single-tree volume and economic outturn percentage of C.lanceolata increase with the raising of the thinning intensity whereas the stocking and total outturn per unit area reduce with the increase of the thinning intensity;and the economic benefits of the moderate thinning are highest for the different site index classes(16,18),those of the strong thinning are second and those of the control are lowest.更多还原