[A-CG46] 陸域生態系の物質循環

[ACG46-06] 熱帯林および温帯林における葉群クロロフィル蛍光の鉛直多層観測

*両角 友喜¹、野田 響¹、加藤 知道²、村岡 裕由³、中路 達郎²、高梨 聡⁴、小杉 緑子⁵、Lion Marryanna⁶ (1.国立環境研究所、2.北海道大学、3.岐阜大学、4.森林総合研究所、5.京都大学、6.Forest Research Institute Malaysia (FRIM))

キーワード：光学リモートセンシング、光合成、東南アジア、タワー観測

Tropical forests are the most diverse and vertically heterogeneous among terrestrial ecosystems, which play an essential role in the global carbon cycle. In the stratified forest, which exhibits the assembly of tall trees, seedlings, and small herbaceous plants, the light utilization of vertical profile is key to understanding variations of carbon uptake. In the present study, we focused on chlorophyll fluorescence in overstory and understory as a proxy for CO₂ assimilation rate. We used the Fraunhofer-line approach to retrieve solar-induced chlorophyll fluorescence (SIF) at the canopy scale with tower-mounted fine spectral visible-near-infrared sensors to detect fluorescence at 760 nm wavelength. The results include a diurnal and seasonal analysis of the tropical evergreen broadleaved forest at the 52 m tower in inland Peninsular Malaysia in 2024. The implication of ecophysiological function will be discussed in comparison with the previous report on a temperate forest in Gifu, central Japan.