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分析了栽杉保阔育林法 (A) 1 0年生林分的树高、胸径和蓄积量的生长进程 ,并与传统育林法 (B)的林分作了比较。结果表明 ,1 0年生林分的平均年生长量指标均达到“速生丰产林”的标准 ,但B大于A。A基本形成人工与天然的针阔混交林 ;在幼龄阶段胸径生长A慢于B ,林分进入壮龄后A逐渐赶上和超过B ,林分在壮龄末期 ( 9年生 )以后胸径连年生长量均下降 ,但A比B下降幅度小 ;树高受育林方法的影响较小。经预测 ,A的林分总蓄积量在 1 2年生时将接近和超过B ,进一步证明栽杉保阔育林法的优越性
The growing process of tree height, diameter at breast height and stock volume of 10 years old stands of broadleaf forest (A) was analyzed and compared with that of the traditional plantation (B). The results showed that the average annual growth index of 10-year-old stands reached the standard of “fast-growing and high-yield forest”, but B was greater than A. A basically formed artificial and natural mixed coniferous and broad-leaved forest; in the young stage, the DBH growth was slower than B; after entering the young age, the A gradually caught up with and exceeded B; the DBH after the end of the young age (9 years old) The amount of growth decreased, but the decrease of A was less than that of B. The height of tree was less affected by the method of afforestation. It is predicted that the total stock volume of A will be close to and exceed B at the age of 12 years, further demonstrating the superiority of the planted broadleaf forest