峦大杉人工林树冠、根系生长和林木分级的早期密度效应  

Early Density Effect on Growth of Crown and Root,and Forest Classification of Cunninghamia konishii Plantation

作　　者：欧建德 吴志庄[2] Ou Jiande;Wu Zhizhuang(Mingxi Forestry Bureau, Sanming 365200, P. R. China;China National Bamboo Research Center Key Laboratory of High Efficient Processing of Bamboo of Zhejiang Province)

机构地区：[1]明溪县林业局,福建三明365200 [2]国家林业局竹子研究开发中心浙江省竹子高效加工重点实验室

出　　处：《东北林业大学学报》2018年第12期15-19,共5页Journal of Northeast Forestry University

基　　金：福建省属公益类科研院所基本科研专项(2011R1013-2).

摘　　要：为了解峦大杉林分树冠、根系以及林木分级的密度效应,通过测定福建省12个8年生不同林分密度的峦大杉样地的树冠、根系的生长性状与分级木比例情况,并将12个林分密度样地按照不同密度划分为4种密度类型(2 325～2 475、2 700～2 750、2 800～3 000、3 350～3 375株·hm^(-2)),进行密度类型间的树冠根系生长与各分级木比例等性状的差异性比较。结果显示:(1)林分密度显著影响峦大杉树冠生长和生长竞争指标。树冠冠幅、冠长、树冠率、树冠体积、表面积、树冠生长空间指数和生长空间竞争指数随着密度增加而减少,树冠圆满度、树冠生产效率随着密度增加而增加;峦大杉的冠幅、树冠率和树冠圆满等3个性状显著性变化的密度较冠长明显更小,树冠体积、表面积和树冠生产效率等3个性状显著性变化的密度一致。峦大杉的生长空间竞争指数显著性变化的密度较生长空间指数更小。(2)林分密度显著影响峦大杉的单株根生物量、根幅与根深等根系性状,峦大杉根系生长量与根幅随着密度增加而减少;根深随密度增加而增加;峦大杉单株根生物量、根幅和根深等性状显著性变化的密度一致。(3)林分密度显著影响着峦大杉优势木和被压木比例,但对平均木比例无显著性影响。峦大杉优势木比例与被压木比例显著性变化的密度一致。For testing the density effect of crown,root and forest classification of Cunninghamia konishii,a field experiment was conducted to study the growth traits of crown,root systems,and tree classification in 12 plots of 8-a C. konishii plantation with different stand density,and the 12 stand density plots with different density were divided into 4 types of density( 2 325-2 475,2 700-2 750,2 800-3 000,and 3 350-3 375 trees per hm2). The difference between the crown root growth and the graded wood’s proportion of the density types were analyzed. The results showed:( 1) the stand density had significant effect on growth and competition index of tree crown of C. konishii,the crown width,crown length,crown ratio,crown volume,surface area,growth space index and growth space competition index showed decreasing with the increasing of density,and the crown fullness ratio and crown production efficiency showed increasing with the increasing of density.The density of significant change of crown width,crown ratio and crown fullness ratio was smaller than that of crown length,the density of significant changes of crown volume,crown surface area and canopy productivity was consistent. The density of significant change of growth space competition index was smaller than that of growth space index.( 2) the stand density had significant effect on root traits of C. konishii,such as individual root biomass,root width and root depth,individual root biomass,root width showed decreasing with the increasing of density,and root depth showed increasing with the increasing of density; The density of significant changes of individual root biomass,root width and root depth was consistent.( 3) the stand density significantly affected the ratio of dominant stem and overtopped stem of C. konishii,and the stand density had no significant effect on the average stem proportion; The density of significant changes of the ratio of dominant stem and overtopped stem was consistent.

关 键 词：峦大杉 人工林 树冠 根系 林木分级 林分密度 

分 类 号：S751[农业科学—森林经理学]