论文部分内容阅读
为研究白桦林下红松树冠下的光场和温场特征；选择白桦幼龄林、中龄林和成熟林．各定位3－4株1-8年生的红松幼苗或幼树；应用点温计和数字式照度计测定幼苗冠下光照和温度的分布特征。结果表明，①红松幼苗树冠下光场在直角坐标系中呈抛物线型；②红松幼苗树冠边缘总有较高的光照刺激；③更新红松树冠下地面温场20－80cm范围内为均匀分布，各时刻温场波度在0．4℃-28℃的幅度内；④温场和光场的连续性有时受光斑和暗班的影响。
In order to study the light field and temperature field under the canopy of Pinus bungeana, the young birch, middle-aged and mature forests were selected. Each of 3-4 1-3 year-old Korean pine seedlings or saplings was located. The distribution characteristics of light and temperature under the canopy of the seedlings were measured by using a pyrometer and a digital illuminometer. The results showed that ① the light field under the canopy of the Korean pine seedlings was parabolic in the Cartesian coordinate system; ② the crown of the Korean pine seedlings always had the higher light stimulation; ③ the average ground temperature under the canopy of the Korean pine canopy was uniform within the range of 20-80 cm Distribution, the temperature field at each time wave in the range of 0.4 ℃ -28 ℃; ④ the temperature field and the continuity of the light field sometimes affected by light spots and dark classes.