B008-08
Assessing the effect of nitrogen addition treatment on Solar-Induced Chlorophyll Fluorescence on winter wheat in Japan: Field-based detection and radiative modelling

Monday, 7 December 2020: 07:28
Virtual
Tomoki Morozumi1, Tomomichi Kato1, Hideki Kobayashi2, Yuma Sakai3, Kanokrat Buareal4, Katsuo Tsujimoto5, Lan Wu6, Hideki Ninomiya4 and Yukari Mizuno7, (1)Research Faculty of Agriculture, Hokkaido University, Sapporo, Japan, (2)Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan, (3)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, (4)Graduate School of Global Food Resources, Hokkaido University, Sapporo, Japan, (5)Tohoku University, Sendai, Japan, (6)Hainan University, College of Ecology and Environment, Hainan, China, (7)Hokkaido University, Sapporo, Japan
Recorded Presentation
Abstract:
The influence of nitrogen input, as a key chemical factor on plant growth, has been investigated in field experiments to understand the mechanism controlling the gross primary production and optimize management to improve the efficiency of crop yield. Chlorophyll is the pigment compound occupying the large proportion of plant nitrogen content. Therefore, Solar Induced Chlorophyll Fluorescence (SIF), remote sensing proxy of photosynthetic capacity, thought to be affected by nitrogen addition. We constructed the continuous canopy SIF observation system with high resolution spectrometer, and examined (I) the relationships of SIF to photosynthesis estimated by ecophysiological model based on gas exchange analysis, (II) the effect on radiative transfer modelled-SIF from structural growth of plant body, leaf-level chlorophyll content in 3-levels Nitrogen fertilizer treatments, to investigate the potential of SIF to detect the fertilized crop growth. Incoming and outgoing spectral radiances, at three different N fertilized plots with 2 replications were measured by high resolution spectrometer (HR4000, Ocean Optics, Dunedin, FL, USA; spectral resolution: 0.12 nm) during April-July in 2019 at a winter wheat (Triticum aestivum) field in Hokkaido Agricultural Research Center, Sapporo, Hokkaido, northern Japan. SIF was retrieved using spectral fitting method for O2-A absorption band (759-767nm). We also observed leaf-level photosynthesis capacities (Vcmax, Jmax), plant height and relative chlorophyll content. Forest Light Environmental Simulator-SIF (FLiES-SIF) model was modified to simulate wheat canopy SIF under various 3D stand structure. We presented that SIF varied daily and seasonally, and those patterns differed among Nitrogen fertilized stages, and related to factors of leaf photosynthetic activity, optically modelled wheat canopy SIF and estimated CO2 assimilation ratios. Those preliminary results indicate that SIF signals responded with photosynthetic capacity affected by Nitrogen addition, and it suggests the use of SIF could contribute to efficient crop production.
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