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Coupling sun-induced chlorophyll fluorescence (SIF) with soil-plant-atmosphere research (SPAR) chambers to advance applications of SIF for crop stress research
Remote Sensing of Environment ( IF 11.1 ) Pub Date : 2024-10-16 , DOI: 10.1016/j.rse.2024.114462
C.Y. Chang, M.A. Hassan, T. Julitta, A. Burkart

Sun-induced chlorophyll fluorescence (SIF) has recently emerged as a proxy for canopy photosynthesis of vegetation and offers a promising approach for scalable remote crop monitoring. Effective application of SIF for crop monitoring requires better understanding of the processes that cause SIF-photosynthesis decoupling at leaf and canopy scales. To answer this challenge, we developed a novel automated multi-targeting hyperspectral spectrometer (OctoFlox). First, we evaluated the performance of OctoFlox and found high stability and cross-channel comparability. Second, we performed an evaluation of different SIF retrieval methods to identify the best suited retrieval method for our system configuration for both red (SIFRed) and far-red SIF (SIFFR). We then deployed OctoFlox within Soil-Plant Atmosphere Research (SPAR) controlled-environment chambers that enable measurement of canopy-scale SIF and photosynthesis with matching footprints. We analyzed the effect of the SPAR chamber tops on the light environment and found minimal impact on the spectral response. Lastly, we examined the response of SIF and canopy photosynthesis using the SPAR chambers. Soybean plants were evaluated at pre-drought, drought (irrigated at 100 % field capacity vs. 33 % field capacity for 2 weeks) and after 1 week recovery from drought. During early growing season, SIFFR and SIFRed exhibited similar responses. At peak growing season (R2 growth stage), SIFFR increased during afternoon depression of photosynthesis, but SIFRed decreased. We demonstrate that pairing SIF instrumentation with SPAR chambers can accelerate understanding SIF-photosynthesis relationships from diurnal to seasonal scales in relation to crop physiological responses to abiotic stress. We provide user recommendations for future applications using OctoFlox and SPAR chambers for co-measuring SIF and GPP.

中文翻译:


将太阳诱导的叶绿素荧光 (SIF) 与土壤-植物-大气研究 (SPAR) 室相结合,以推进 SIF 在作物胁迫研究中的应用



太阳诱导的叶绿素荧光 (SIF) 最近已成为植被冠层光合作用的代表,并为可扩展的远程作物监测提供了一种很有前途的方法。将 SIF 用于作物监测的有效应用需要更好地了解在叶片和冠层尺度上导致 SIF 光合作用解耦的过程。为了应对这一挑战,我们开发了一种新型的自动多目标高光谱仪 (OctoFlox)。首先,我们评估了 OctoFlox 的性能,发现了高稳定性和跨通道可比性。其次,我们对不同的 SIF 检索方法进行了评估,以确定最适合我们的红光 (SIFRed) 和远红光 SIF (SIFFR) 系统配置的检索方法。然后,我们在土壤-植物气氛研究 (SPAR) 受控环境室中部署了 OctoFlox,该室能够测量树冠尺度的 SIF 和具有匹配足迹的光合作用。我们分析了 SPAR 腔室顶部对光环境的影响,发现对光谱响应的影响很小。最后,我们使用 SPAR 室检查了 SIF 和冠层光合作用的响应。在干旱前、干旱(以 100% 的田间容量灌溉,以 33% 的田间容量灌溉 2 周)和从干旱中恢复 1 周后对大豆植株进行评估。在生长季节早期,SIFFR 和 SIFRed 表现出相似的反应。在生长高峰期 (R2 生长阶段),SIFFR 在光合作用下午抑制期间增加,但 SIFRed 降低。我们证明,将 SIF 仪器与 SPAR 室配对可以加速理解从昼夜尺度到季节尺度的 SIF 光合作用关系与作物对非生物胁迫的生理反应有关。 我们为未来使用 OctoFlox 和 SPAR 暗室共同测量 SIF 和 GPP 的应用提供用户建议。
更新日期:2024-10-16
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