我国水资源有限，农业旱灾多发，亟需发展农业旱情遥感监测技术，提高农业抗旱能力，发展节水型农业。叶绿素荧光是植物光合作用的有效探针，利用日光诱导叶绿素荧光（solar-induced fluorescence ，SIF）有望发展新型的农业旱情遥感监测方法。但目前干旱胁迫下作物冠层SIF的响应规律尚不明确。因此本项目计划通过实验观测和模型模拟，分析冠层结构、太阳角度、土壤背景等因素对冠层荧光的影响规律，检验冠层SIF与作物冠层整体生理状态的关联程度，发现干旱胁迫下冬小麦、玉米冠层荧光的响应规律及其差异，为发展基于SIF的遥感干旱胁迫探测技术打下理论基础。

Because of limited water resources and frequent agricultural droughts in our country, there is urgent need of developing remote sensing monitoring technology of agricultural drought to improve the agricultural drought resistance ability and develop water-saving agriculture. Chlorophyll fluorescence is an effective probe of plant photosynthesis. It is promising to develop a new type of agricultural drought remote sensing monitoring methods based on the solar-induced fluorescence (SIF). But the response law of crop canopy SIF under drought stress is unclear. Through experimental observations and model simulation, this project will 1) analyze the influence law of canopy structure, the angle of the sun and the soil background on canopy fluorescence, 2) inspection the relationship between the canopy SIF and the crop physiology state of whole canopy, 3) find the response of canopy SIF of winter wheat and corn under drought stress. The study will lay a theoretical basis for the development of remote sensing drought stress detection technology based on SIF.