巨尾桉大径材间伐试验研究  

Thinning Trial on Eucalyptus grandis × E. urophylla Stand for Large-Diameter Timber Production

作　　者：张金文 

机构地区：[1]福建省漳州市农业科学研究所,福建漳州363005

出　　处：《林业科学研究》2008年第4期464-468,共5页Forest Research

基　　金：福建省林业厅科学基金资助项目(闽林科[2002]10号)

摘　　要：为培育巨尾桉大径材,对造林密度为1 650株.hm-2的10年生巨尾桉,开展二次间伐试验,首次间伐在造林后3 a进行,第二次间伐在第1次间伐后3 a进行,分别设置间伐株数2/3、1/2、1/3及不间伐(对照)4种间伐强度处理,采用随机区组试验设计。分析不同间伐强度对巨尾桉林分胸径、树高、单株材积、林分蓄积和经济效益的影响。结果表明:第2次间伐保留密度为645株.hm-2的林分,其平均胸径23.6 cm、立木单株材积0.552 5 m3、林分蓄积356.379 m3.hm-2、经济效益为293 385元.hm-2,分别比对照增加21.2%、54.2%、5.2%、28.4%,均优于其他不同处理。表明间伐强度以株数1/3为宜,保留密度为645株.hm-2的巨尾桉大径材林分,其胸径、单株材积、林分蓄积量和经济效益达到最大值。In order to cultivate large-diameter Eucalyptus grandis × E. urophylla timber, a twice-thinning trial was conducted on 10-year-old E. grandis × E. urophylla stand with the initial density of 1 650 trees per hectare. The first thinning was conducted 3 years after afforestation, and the second thinning conducted 3 years after the first thinning. Three thinning intensities （2/3,1/2, and 1/3）and a control （no thinning）were arranged. The randomized block experimental design was adopted to study the effects of different thining intensities on the DBN, tree height, individual volume, stand volume and economic benefits of E. grandis × E. urophylla. The results showed that the mean DBN, individual volume, stand volume and economic benefits of the stand with 645 trees reserved per hectare after the second thinning were 23.6 cm,0.552 5 m^3 ,356. 379 m^3·hm^-2 ,and 293 385 RBM yuan,which increased by 21.2% ,54.2% ,5.2% and 28.4% compared with the control respectively, and better than the other thinning treatments. It also showed that the optimal thinning intensity was 1/3. The large-diameter E. granclis × E. urophylla stand with the reserved density of 645 trees per hectare could maximize the DBH, individual volume, stand volume and economic benefits of E. grandis × E. urophylla stand.

关 键 词：巨尾桉 大径材 间伐试验 

分 类 号：S792.39[农业科学—林木遗传育种]