%0 Journal Article
%T Detecting Photosynthesis Fluorescence under Natural Sunlight Based on Fraunhofer Line<br>利用夫琅和费暗线探测自然光条件下的植被光合作用荧光研究
%A LIU Liang-yun
%A ZHANG Yong-jiang
%A WANG Ji-hua
%A ZHAO Chun-jiang
%A <br>刘良云
%A 张永江
%A 王纪华
%A 赵春江
%J 遥感学报
%D 2006
%I 
%X The amount of chlorophyll fluorescence emitted by a leaf or canopy under natural sunlight is difficult to quantify because the signal is obscured by the reflected light.Firstly,the principle and method of separating the fluorescence emissive signal from canopy radiance spectrum based on Fraunhofer line was introduced.Secondly,the Solar Fraunhofer line was linked to the molecular oxygen absorption by the terrestrial atmosphere at 688nm and 760nm.The two Fraunhofer lines at 688nm and 760nm are obvious in the radiance spectra by ASD FieldSpec Pro NIR spectrometer,which largely overlap the chlorophyll fluorescence emission spectrum of leaves.Therefore,the two Fraunhofer lines at 688nm and 760nm could be selected to detect the emissive fluorescence.Thirdly,the statistical correlative coefficients(R~2) between PAR and emissive fluorescence of winter wheat and Parthenocissus tricuspidata at 688nm and 760nm reach 0.9.The emissive fluorescence of winter wheat at 688nm equals to that at 760nm,the emissive fluorescence of Parthenocissus tricuspidata at 688nm is 3 times larger than that at 760nm.Compared with canopy reflectance spectrum,fluorescence spectrum is more sensitive to species and plant stress conditions.Finally,the emissive fluorescence at 688nm and 760nm was related to F_v/F_m by a OS1-FL modulated chlorophyll fluorometer,the correlative coefficients are highly significant at 0.999 confident level,which means that the emissive fluorescence calculated from the two Fraunhofer lines at 688nm and 760nm could replace the modulated chlorophyll fluorometer method and be applied to airborne remote sensing.
%K fluorescence
%K Fraunhofer line
%K spectra
%K photosynthesis
%K remote sensing<br>荧光
%K 夫琅和费暗线
%K 光谱
%K 光合作用
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=A41A70F4AB56AB1B&jid=F926358B31AC94511E4382C083F7683C&aid=AA53BF7E93503849&yid=37904DC365DD7266&vid=F3090AE9B60B7ED1&iid=CA4FD0336C81A37A&sid=B47A0E731AF43EB2&eid=205BE674D84A456D&journal_id=1007-4619&journal_name=遥感学报&referenced_num=1&reference_num=13