【摘要】 <正> 红松生长与光照关系十分密切,光在影响红松生长诸因子中起重要作用。为进一步探讨红松生长与光的关系,做了在不同光照条件下,10年生红松生长的观测,其结果如下。一、观测区自然概况观测区位于桓仁县大南沟的尹家大坡,东经124°51′,北纬41°13′,海拔高550-1,200米,年平均气温4.6℃,年降雨量900毫米,无霜期120天;西坡5—10度,暗棕色森林土,土层厚20—40厘米;观测区伐前是以山杨(Populus davidiana)、黄桦(Betula costata)为主的低产杂木林。于1974年春进行择伐改造,保留胸径4—18厘米有培养前途的目的树种每亩20株左右;改造后林冠下见缝插针更多还原

【Abstract】 Observations of 10 years’ artificial red pine trees show that for trees younger than 10 years old, they can grow faster under a relative illumination of 90—51% than that of 100%.A relative illumination of 50—21% starts to influence the tree growth, and that of <20% has a severe influence.A proper shield can inhibit the regrowth and branching of red pine and postpone its seeding stage.更多还原