长白山阔叶红松林太阳辐射分光谱特征

根据对林冠上方和林下太阳辐射的观测及气象站资料,分析了长白山阔叶红松林太阳辐射分光谱特征。结果表明,长白山阔叶红松林区太阳总辐射、直接辐射、散射辐射的光合有效辐射系数有一定的日变化和年变化,年平均值分别为０．４６、０．４３、０．５６。阔叶红松林中不同树种的单叶对于太阳总辐射的反射率、透射率、吸收率的平均值分别为２７．０％、２３．４％、４９．６％。单叶的分光谱反射、透射和吸收的特点是,单叶对紫外辐射

Spectral characteristics of solar radiation in broadleaved Korean pine forest in Changbai Mountain

Based on the measurement above and below forest canopy and meteorological data,the spectral characteristics of solar radiation in broadleaved Korean pine forest in Changbai Mountain was analyzed.The results show that the photosynthetically active radiation(PAP)coeffcients of total radiation,direct radiation and scatter radiation changed daily and yearly,with an annual averages of 0^46,0^43 and 0^56 respectively.The average reflectivity,transmissitvity and absorptivity of single leaves of different tree species in Korean pine forest were 27^0%,23^4%,49^6% respectively.Single leaves nearly absorbed all of the ultraviolet radiation(UV) and 71^8% of photosynthetically active radiation,but transmitted 9^6% and reflected 18^6%.As for near infrared radiation (NIR),the reflectivity and transmissitivity of leaves were a little less than the absorptivity.The forest canopy absorbed 93^9% PAR and 94^1% UV,but reflected and transmitted less.It absorbed 59^2%,reflected 26^3% and transmitted 14^4% NIR.