摘要
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046、043、056.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270%、234%、496%.单叶的分光谱反射、透射和吸收的特点是,单叶对紫外辐射几乎全部吸收;对光合有效辐射的吸收也很大(718%),透射很小(96%),有一定的反射(186%);对近红外辐射、反射率和透射率接近吸收率小些(269%).林冠分光谱辐射特点是,可见光和紫外辐射主要被林冠吸收(939%、941%),有少量反射和透过;林冠对近红外辐射的吸收较大(592%),有一定的反射(263%),透过较少(144%).
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.
出处
《应用生态学报》
CAS
CSCD
2000年第1期19-21,共3页
Chinese Journal of Applied Ecology
基金
中国科学院百人计划项目!"森林界面生态学"
国家自然科学基金!重点项目 (39730 1 1 0
39470 1 39)
中国科学院长白山开放站基金资助
