杉木短轮伐建材林萌芽更新研究

A study on sprout replant of c hinse fir for short rot ation

在杉木分布北缘的苏南低山丘陵试验研究表明，利用萌芽杯幼龄速生的阶段优势，能发掘短轮伐小径材的生产潜力。影响萌芽林生长的因素主要有更新林分种源的遗传特性，立地条件，伐桩密度与更新方式。在山洼、山谷阴坡坡脚等优良立地，实施２２５０～２４００株／桩·ｈｍｔ２密度控制，小块状更新，集约肥培管抚，９年生萌芽林蓄积量达１１８．２～１２６．７ｍ２／ｈｍ２，可产出约８５％的小径材．在山坡中下部中等立地条件，实施较高密度（３０００～３３００株／桩·ｈｍ２）控制，窄带状（８～１０ｍ宽）更新，集约管抚，９～１５年生蓄积量达１１１．７～１３９．６ｍ３／ｈｍ２，可产出约４０％的小径材和农用椽材。而在较差岗坡立地，即使采取高密度（４５００株／桩·ｈｍ２：），窄带状荫芽更新与高水平集约管抚，也无生产小径材的可能。

Experiinental results in the hilly mountains of jiangsu indicated that using the superior of sprout replant plantion of C hinese fir could increase the produc-tive capacity of small diameter timber by shoit rotation. The factors affecting the growth of sprout plantation mainly were the provenance of replant forest,site condition,replant method , and stump density,By the means of small block replant and intensiye management in good site condition,the volume of 9 yea-rs old Sprout plantation could reach 118.2-126.7m3 /hm2,with the density con-trol of 2250-2400 plant or stump/hm2,which the small diameter timber was 85%.The narrow belt-shaped replant (8-10m widtli)and 3000-3300 plant or stump/hm2in the middle site the volume of 9-15 years old one was 111.7-139.6m3/hm2,with 40%small diameter timber and rafter,However,in the bad site,even if the high density(4500 plant or stump/hm2),narrow belt-shaped replant,and goodintensive management were aplied,the probality of small diameter prcductionwas not existed .