湘南地区马尾松人工林间伐效果的分析研究  

Thinning effects of Pinus massoniana plantations in the southern region of Hunan province

作　　者：李志辉[1] 

机构地区：[1]中南林业科技大学,湖南长沙410004

出　　处：《中南林业科技大学学报》2010年第4期1-6,共6页Journal of Central South University of Forestry & Technology

基　　金：国家"十一五"科技支撑项目(2006BAD24B0301)

摘　　要：以生物产量为数量指标来揭示抚育间伐对马尾松人工林生产力的影响。研究表明:不论何种立地,马尾松人工林单株生物量随间伐强度的提高而增大。14指数级的间伐样地,平均单株生物量是对照样地的1.31倍,强度间伐是对照的1.49倍。14指数级的林分,首次间伐以中度间伐为好。林分生物量与间伐强度成反比,即间伐强度越大现存生物量越小。间伐样地林分生产力具有与林分生物量同样的变化规律。间伐6年间2种立地林分生产力远远高于林分平均生产力,14指数级林分,经中度间伐,林分生产力为平均生产力的120%。14指数级的林分,可在16年生时进行弱度疏伐,12指数级的林分,第1次中度间伐后,经营中小径材,可不再进行间伐。间伐能提高林分干材百分率,干材百分率随着间伐强度的提高而提高;间伐能使树干部分通直圆满,提高材种规格和经济利用价值。The thinning effects in Pinus massoniana plantations were studied by using biomass increment as quantitative indexes.The results show as follows.Regardless of site conditions,the individual biomass of P.massoniana plantations increased positively with the raise of thinning intensity.The average per plant biomass of the stand with the site index of 14 was 1.31 times more than the control plot,the biomass of intensity intermediate felling of the stand was 1.49 times more than that of the check plot,and the first thinning for the stand of site index of 14 was the suitable moderate thinning.The stand biomass was inversely proportional to thinning intensity,namely the greater thinning intensity was,the smaller the existing biomass was.The thinning stand productivity had the same change law as the stand biomass.In six years with thinning,stand productivity was greater than the average.The stand productivity with the site index of 14 by moderate thinning was 120% of the average.For the stand with the site index of 14,light thinning can be executed at 16-year-old.For the stand with the site index of 12,no thinning need be executed after the 1st moderate thinning if the stand was for producing small-diameter lumber and mid-diameter lumber.It was proved that thinning could help to raise the stem-wood percentage of the stand,which increased with the increase of the thinning intensity,and to make the stem straight and fatness,and to promote the wood specifications and wood economic value.

关 键 词：林学 马尾松人工林 间伐效果 生物量 生产力 湘南地区 

分 类 号：S791.248[农业科学—林木遗传育种] S753[农业科学—林学]