天然杨桦工业原料林密度调控技术  

Density Control Techniques of Natural Poplar-Birch Forest for Industrial Raw Material Plantation

作　　者：兰士波 

机构地区：[1]黑龙江省林业科学研究所经济林研究室,黑龙江哈尔滨150081

出　　处：《北华大学学报（自然科学版）》2012年第4期457-462,共6页Journal of Beihua University（Natural Science）

基　　金：国家科技支撑项目(2012BAD22B02-05);黑龙江省重点科技支撑项目(GA07B301-07)

摘　　要：以东北商品林中杨桦次生林为对象,采用定位观测与随机调查相结合的方法,通过林分立地类型划分、林分生长进程规律分析和密度效应的综合评价,确定0.7为天然杨桦工业原料林优质高效经营的最适密度,该密度的林分能充分利用生境,林木生长势最强,光能利用率最高,养分归还量最多,林分蓄积生长量最大.在此基础上,以林分经营密度为自变量,上层林木的平均树高、平均胸径、疏密度和林分初始密度为因变量,绘制密度调控曲线,直观展示各变量因子间错综复杂的数量关系,从定量角度确定最适密度下的林分蓄积、间伐株数量、间伐蓄积和间伐强度,提出了天然杨桦工业原料林密度调控技术与模式,为科学合理地经营天然杨桦工业原料林提供了理论依据和技术支撑.Combined continuous and oriented observation of permanent sample plots with investigation of temporary sample plots,on the base of size classification of poplar and birch natural forests,the regularity of growth process,and analysis and evaluation of the density effect,we concluded the density control techniques and pattern of natural Poplar-Birch forest for industrial raw material plantation.Result of this study can provide a theory warranty and support of science and technology for the directive cultivation of secondary Poplar-Birch forest.The results showed that the suitable density of high quality and efficient management of natural Poplar-Birch forest for industrial raw material plantation is 0.7,under the density conditions,the utility rate of luminous energy,and the nutrient return revert and volume growth of forest stands is maximum.Drawing density control curve can display visually the complexity of the quantity relationship between the each variable factors,the stand volume,thinning number,thinning volume,and its thinning intensity were determined from quantitative angle.

关 键 词：工业原料林 生长进程 经营密度 密度调控 

分 类 号：S750[农业科学—森林经理学]