摘要
该文根据对北京妙峰山林场 3个不同密度栓皮栎人工林光照强度的实测结果分析得出 :林冠透射率随太阳高度角的增大而增大 ,日变动范围 0 .0 6 6 0～ 0 .1 1 1 8,林地反射率的日变动范围 0 .0 0 2 7～ 0 .0 0 6 6 ,林地吸收率0 .0 6 32～ 0 .6 0 5 2 .光斑的光照强度随着直径的增大而增加 ,中心相对照度和直径呈正指数关系 .光照强度在垂直方向上的变化是从上到下递减的 ,且递减率逐渐减小 .林分的郁闭度越大 ,林冠吸收率越大 ,透射率越小 ,反射率越大 .
From the analyses on the data of actual measurement of three different densities Quercus variables artificial light intensity of sunny days, we draw conclusions as follows: transmission through canopy increases when the sunlight increases, ranging from 0.066?0 to 0.111?8 daily. The reflection ranges from 0.002 7 to 0.006 6 and the absorption does from 0.063 2 to 0.605 2 daily. Light intensity of facula increases when the diameter of the trees increases, and there lies a correctitude index relationship between the center relative light intensity and diameter. Depressive percentage of light intensity decreases with the decrease of the height. When the crown density increases, the absorption and the reflection also increase, but the transmission decreases.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2000年第4期92-96,共5页
Journal of Beijing Forestry University
基金
国家林业局资助!"北京林业大学山西太岳山生态定位研究站"研究内容
关键词
栓皮栎
光照强度
相对照度
光斑
Quercus variables, light intensity, relative light intensity, facula
