Diurnal Response of Sun-Induced Fluorescence and PRI to Water Stress in Maize Using a Near-Surface Remote Sensing Platform
Diurnal Response of Sun-Induced Fluorescence and PRI to Water Stress in Maize Using a Near-Surface Remote Sensing Platform
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使用近地表遥感平台太阳诱导荧光和 PRI 对玉米水分胁迫的日响应
DOI：
10.3390/rs10101510
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发表时间：
2018-09
期刊：
影响因子：
5
通讯作者：
Sanxue Ren
中科院分区：
文献类型：
--
作者：
Shan Xu;Zhigang Liu;Liang Zhao;Huarong Zhao;Sanxue Ren
利用田间太阳诱导荧光（SIF）和光化学反射指数（PRI）数据，研究了玉米冠层尺度上不同水分胁迫下的日变化。利用自动田间光谱系统对4个不同灌溉处理的田间小区进行了玉米冠层的连续和长期测量。该系统利用光谱仪采集可见光到近红外光谱，在480~850 nm的光谱范围内提供亚纳米光谱分辨率。分别在O2-A和O2-B波段采用光谱拟合方法（SFM）获取红SIF（FR）和远红SIF（FFR）数据。除PRI外，Δ PRI值通过减去清晨PRI值从PRI中得出。光合有效辐射（PAR）的数据，冠层部分吸收PAR（fPAR），和空气/冠层温度和光系统II操作效率（YII）在叶尺度上同时收集。本文比较了拔节期浇水前后各参数的日变化规律。结果表明：（1）水分胁迫下，FR和FFR均下降，但FR的峰值始终出现在中午，且FFR的峰值随着胁迫程度的增加而提前。叶片折叠和非光化学猝灭（NPQ）的增加是这种趋势的主要原因。叶片YII在8：00 ~ 14：00逐渐下降，然后恢复。在干旱条件下，叶片YII较小，下降更快。因此，叶片和冠层尺度上的荧光产量对水分胁迫都有响应。(ii)作为NPQ变化的良好指标，昼夜PRI和Δ PRI数据也显示出由于水分胁迫而导致的特定下降。Δ PRI可以消除冠层结构的影响。水分胁迫下，Δ PRI在8：00 ~ 13：00之间迅速下降，最大降幅约为0.05。13：00以后，它们的值开始增加，但不能恢复到早晨的水平。(iii)较高的冠气温差（Δ T）表明气孔关闭导致叶温升高，下午叶温维持较高状态。总之，为了科普水分胁迫，叶片折叠和生理变化都被激活。在监测干旱方面，SIF在中午左右表现最好，PRI在中午之后表现更好。
Sun-induced Fluorescence (SIF) and Photochemical Reflectance Index (PRI) data were collected in the field over maize to study their diurnal responses to different water stresses at the canopy scale. An automated field spectroscopy system was used to obtain continuous and long-term measurements of maize canopy in four field plots with different irrigation treatments. This system collects visible to near-infrared spectra with a spectrometer, which provides a sub-nanometer spectral resolution in the spectral range of 480~850 nm. The red SIF (FR) and far red SIF (FFR) data were retrieved by Spectral Fitting Methods (SFM) in the O 2 -A band and O 2 -B band, respectively. In addition to PRI, Δ PRI values were derived from PRI by subtracting an early morning PRI value. Photosynthetic active radiation (PAR) data, the canopy fraction of absorbed PAR (fPAR), and the air/canopy temperature and photosystem II operating efficiency (YII) at the leaf scale were collected concurrently. In this paper, the diurnal dynamics of each parameter before and after watering at the jointing stage were compared. The results showed that (i) both FR and FFR decreased under water stress, but FR always peaked at noon, and the peak of FFR advanced with the increase in stress. Leaf folding and the increase in Non-photochemical Quenching (NPQ) are the main reasons for this trend. Leaf YII gradually decreased from 8:00 to 14:00 and then recovered. In drought, leaf YII was smaller and decreased more rapidly. Therefore, the fluorescence yield at both the leaf and canopy scale responded to water stress. (ii) As good indicators of changes in NPQ, diurnal PRI and Δ PRI data also showed specific decreases due to water stress. Δ PRI can eliminate the impact of canopy structure. Under water stress, Δ PRI decreased rapidly from 8:00 to 13:00, and the maximum range of this decrease was approximately 0.05. After 13:00, their values started to increase but could not recover to their morning level. (iii) Higher canopy-air temperature differences ( Δ T ) indicate that stomatal closure leads to an increase in leaf temperature, which maintains a higher state in the afternoon. In summary, to cope with water stress, both leaf folding and changes in physiology are activated. To monitor drought, SIF performs best around midday, and PRI is better after noon.
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DOI：
10.3390/s16060775
发表时间：
2016-05-27
期刊：
Sensors (Basel, Switzerland)
影响因子：
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DOI：
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