免炼山对桉树人工林生长的影响初探

Preliminary Study on Effects of Non-burning Treatment on Growth of Eucalypt Plantation

为了研究一种能代替炼山的采伐剩余物管理方式,以尾巨桉(Eucalyptus urophylla×E.grandis)人工林为研究对象,采用“风炮机”和“二锄法”等高工效免炼山综合管理技术,探究免炼山处理方式对桉树人工林生长的影响。结果表明,免炼山处理4年后,林分的蓄积量、胸径和树高分别比炼山处理高出20.66%、1.88%和7.97%;免炼山区的树高生长速度显著高于炼山区,平均胸径在第3年显著高于炼山区,第3~4年胸径增长速度放缓,可能是未施肥造成的。该免炼山造林技术操作简便,在减少肥料投入量的情况下,免炼山区域桉树人工林生长更好。

In order to study a management method of harvest residues to replace burning,taking Eucalyptus urophylla×E.grandis plantation as research object,high-efficiency non-burning comprehensive management technologies such as"guns"and"second-hoe method"were applied,and effects of non-burning treatment on growths of eucalypt plantation were studied.Results showed that after 4 years of non-burning treatment,stand accumulation,DBH and tree height were 20.66%,1.88%and 7.97%higher than those of burning treatment,respectively.Growth rate of tree height in non-burning treatment was significantly higher than that in burning treatment.Average DBH in nonburning treatment was significantly higher than that in burning treatment in the third year.Growth speed of DBH slowed down from the third to the fourth year,which might be caused by no fertilization.The non-burning technology was easy to operate.In the condition of reducing fertilizer input,growth of eucalypt plantation in non-burning treatment was better.