Diurnal Cycle Relationships between Passive Fluorescence, PRI and NPQ of Vegetation in a Controlled Stress Experiment

被引:65
作者
Alonso, Luis [1 ]
Van Wittenberghe, Shari [1 ]
Amoros-Lopez, Julia [1 ]
Vila-Frances, Joan [1 ]
Gomez-Chova, Luis [1 ]
Moreno, Jose [1 ]
机构
[1] Univ Valencia, IPL, C Catedrat Jose Beltran 2, Valencia 46980, Spain
关键词
drought; stress; non-photochemical energy dissipation; solar-induced fluorescence (SIF); photosynthesis; non-photochemical quenching (NPQ); Photochemical Reflectance Index (PRI); FLuorescence EXplorer; (FLEX); PHOTOCHEMICAL REFLECTANCE INDEX; CHLOROPHYLL FLUORESCENCE; WATER-STRESS; STOMATAL CONDUCTANCE; USE EFFICIENCY; LIGHT; PHOTOSYNTHESIS; CANOPY; PHOTOINACTIVATION; PHOTOPROTECTION;
D O I
10.3390/rs9080770
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In order to estimate vegetation photosynthesis from remote sensing observations; some critical parameters need to be quantified. From all absorbed light; the plant needs to release any excess that is not used for photosynthesis; by non-photochemical quenching; by fluorescence emission and unregulated thermal dissipation. Non-photochemical quenching (NPQ) processes are controlled photoprotective mechanisms which; once activated; strongly control the dynamics of photochemical efficiency. With illumination conditions increasing and decreasing during a diurnal cycle; photoprotection mechanisms needs to change accordingly. The goal of this work is to quantify dynamic NPQ; measured from active fluorescence measurements; based on passive proximal sensing leaf measurements. During a 22-day controlled light and water stress experiment on a tobacco (Nicotiana tabacum L.) leaf we measured the diurnal dynamics of passive fluorescence (Chl F); the Photochemical Reflectance Index (PRI); the Absorbed Photosynthetically Active Radiation (APAR) and leaf temperature in combination with the actively retrieved non-photochemical quenching (NPQ) parameter. Based on a bi-linear combination of diurnal APAR and PRI (plane fit model) we succeeded to estimate NPQ with a RMSE of 0.08. The simple plane fit model estimation represents well the diurnal NPQ dynamics; except for the high light stress phase; when additional reversible photoinhibition processes took place. The present works presents a way of determining NPQ from passive remote sensing measurements; as a necessary step towards estimating photosynthetic rate.
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页数:16
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