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选择白桦幼龄林、中龄林和成过熟林为固定样地，应用ＳＴ—９２型照度计和ＷＭＹ—０１型数字温度计对各林型和各林龄中白桦及其它树种的背阳照度和向阳体温进行了研究，结果表明，白桦树皮背阳照度高于同林分的其它树种，而体温低于其它树种；白桦与其它树种的照度差异随林龄增加而增大，而与其它树种的温度差异都在中龄林中表现最显著；白桦与其它树种在光性能和热性能上形成互补并与红松天然更新有关；热性能互补在中龄林中表现最显著；中龄林的光性能互补居于幼龄林和成熟林之间。
Select young birch forest, middle-aged forest and mature forest as a fixed plots, the use of ST-92 and WMY-01 digital thermometer for each forest type and age of birch and other species of the backlit illumination The results showed that the illumination of birch bark was higher than that of other species in the same stand and the body temperature was lower than that of other species. The difference of illumination between birch and other species increased with age, The difference of tree species temperature was the most significant in the middle-aged forest. The mutualism between the light and thermal properties of the white birch and the natural regeneration of the red pine was related to the temperature difference. The complementary of the thermal performance was the most significant in the middle- The light performance of living in the young and mature forests between the trees.