[A-CG39] 陸域生態系の物質循環

[ACG39-08] カラマツ林の総一次生産量推定における林冠上端の太陽光誘起クロロフィル蛍光SIFの構造的および植物生理学的効果

*両角 友喜¹、野田 響¹、加藤 知道²、小林 秀樹³、酒井 佑槙⁴、高橋 善幸¹ (1.国立環境研究所、2.北海道大学、3.海洋研究開発機構、4.苫小牧工業高等専門学校)

キーワード：光学リモートセンシング、連続観測、群落放射伝達モデル

Solar-Induced chlorophyll Fluorescence (SIF) is related to the photosynthetic processes and is dynamic on an hourly scale responding to gross primary production (GPP). Remotely sensed SIF emitted above the canopy also depends on the canopy structure as described such as the clumping effect. To apply it to the study of the terrestrial carbon cycle, it is important to explore the physiological information within SIF. The 3-D canopy radiative transfer model can explicitly simulate SIF processes and is expected to split the canopy’s structural and physiological effects. The aim of the study is to evaluate the physiological-related SIF-GPP relationship based on a modeling approach for structural effects. The continuous SIF measurement was conducted using a fine spectroradiometer in 2020-2021 on the tower of the FHK flux site in central Japan. The FLiES-SIF model treated the light traveling within relatively sparse tree stands using the input of in-situ leaf-level full-spectral fluorescence yield measured by leaf clip. We present the SIF-GPP relationship among various meteorological conditions. The study further demonstrates the canopy structure effect on tower and satellite observation with various solar and observing angles. The result will be further applied to the regional GPP estimation via satellite SIF observations and models.