抚育间伐强度对辽东地区杂木林生长效应的影响

摘要

By measuring & comparing variations of five major grow th factors (leaf area ,number of trees ,mean diam-eter ,individual volume and accumulation ) for weed trees in Eastern Liaoning Province ,effects of four kinds of thinning intensities on growth effect of weed trees were studied .Result shows that :the leaf area index decrease with the increases of thinning intensity ,and the dead trees decrease due to natural thinning of trees .DBH ,individual vol-ume ,volume growth have great inter-annual differences ;growth rate ,showing variation of size interval ,increase with the increase of thinning intensity ,then decrease to a certain extent ;the growth rate are the largest in the areas within the weak thinning intensity .Comprehensive analysis shows that :weed trees grow well under mild anthropogenic in-terference in Eastern Liaoning Province ;excessive human disturbance is disadvantageous to the management of weed trees .%通过测定和比较辽东地区杂木林叶面积、株数、平均胸径、单株材积和蓄积等生长因子的变化，研究4种间伐强度对杂木林生长效应的影响。结果表明：随间伐强度的增大，叶面积指数降低，因自然稀疏而死亡的林木株数减少；胸径、单株材积、蓄积生长量存在很大的年际差异，生长速度呈现大小间隔变化规律，且随间伐强度的增大而增大，到一定程度后开始降低，皆以弱度间伐区最大。综合分析认为：辽东地区杂木林在轻度人为干扰的条件下生长良好，过多的人为干扰对杂木林经营不利。