冠层叶绿素荧光角度校正及其对植被总初级生产力估算精度的影响  

Angular Normalization of Ground Observations of Sun-induced Chlorophyll Fluorescence for Assessing Vegetation Productivity

作　　者：丑述仁 李明[2] CHOU Shu-ren;LI Ming(Space Security Center,Space Engineering University,Beijing 101416,China;Key Laboratory of Songliao Aquatic Environment,Ministry,School of Civil and Environmental Engineering,Jilin Jianzhu University,Changchun 130118,China)

机构地区：[1]航天工程大学太空安全研究中心,北京101416 [2]吉林建筑大学市政与环境工程学院松辽流域水环境教育部重点实验室,长春130118

出　　处：《科学技术与工程》2020年第26期10665-10668,共4页Science Technology and Engineering

基　　金：国家自然科学基金青年科学基金(41901362);吉林省科技发展项目(20190303092SF);吉林省产业技术研究与开发专项项目(2019C056-6)。

摘　　要：在典型小麦区建立多角度叶绿素荧光观测系统,对多角度叶绿素荧光进行了热点方向角度订正并计算角度校正后冠层总的荧光,利用叶绿素荧光角度校正模型校正后提高了总初级生产力(gross primary production,GPP)的估算精度。结果表明:角度校正后的冠层荧光和热点荧光估算GPP的相关系数(R 2)分别提高0.22±0.06和0.23±0.02。厘清不同条件下观测几何对冠层日光诱导叶绿素荧光(sun-induced chlorophyll fluorescence,SIF)和GPP的贡献差异,分析利用SIF估算GPP的误差,优化基于SIF的GPP估算模型。Ground observations were normalized at multiple angles on clear days to the hotspot direction(SIF hotspot)and a weighted sum of SIF(SIF canopy)was computed from sunlit and shaded leaves to represent the canopy.Results show that angular normalization of multiple angle SIF measurements significantly improves the correction of SIF to GPP derived from EC measurements over a wheat canopy.The total canopy SIF(SIF canopy)and the SIF in the hotspot direction(SIF hotspot),obtained after the angular normalization,are better correlated with GPP than the original SIF observation.The coefficients of determination(R 2)increase by 0.22±0.06 and 0.23±0.02 using SIF canopy and SIF hotspot,respectively,after the angular normalization.

关 键 词：冠层叶绿素荧光 热点叶绿素荧光 角度订正 总初级生产力 

分 类 号：Q948.2[生物学—植物学]