scholarly journals Relationship between photochemical reflectance index with multi-angle hyper-spectrum and light use efficiency in urban green-land ecosystems

2016 ◽  
Vol 40 (10) ◽  
pp. 1077-1089
Author(s):  
YANG Zhi-Qing ◽  
◽  
CHEN Bao-Zhang ◽  
ZHA Tian-Shan ◽  
and JIA Xin
Keyword(s):  
Light Use Efficiency ◽  
Urban Green ◽  
Photochemical Reflectance Index ◽  
Use Efficiency ◽  
Urban Green Land ◽  
Green Land

scholarly journals Ability of the Photochemical Reflectance Index to Track Light Use Efficiency for a Sub-Tropical Planted Coniferous Forest

2015 ◽  
Vol 7 (12) ◽  
pp. 16938-16962 ◽  
Author(s):  
Qian Zhang ◽  
Weimin Ju ◽  
Jing Chen ◽  
Huimin Wang ◽  
Fengting Yang ◽  
...  
Keyword(s):  
Coniferous Forest ◽  
Light Use Efficiency ◽  
Photochemical Reflectance Index ◽  
Use Efficiency

Estimating photosynthetic light-use efficiency using the photochemical reflectance index: variations among species

2004 ◽  
Vol 31 (3) ◽  
pp. 255 ◽  
Author(s):  
Jianmin Guo ◽  
Craig M. Trotter
Keyword(s):  
Light Response ◽  
Species Group ◽  
Photosynthetic Parameters ◽  
Co2 Uptake ◽  
Light Use Efficiency ◽  
Photochemical Reflectance Index ◽  
Response Data ◽  
Use Efficiency ◽  
Species Specific ◽  
The Relationship

Recent studies have shown that the photochemical reflectance index (PRI), derived from narrow waveband reflectance at 531 and 570 nm, can be used as a remote measure of photosynthetic light-use efficiency (LUE). However, uncertainty remains as to the consistency of the relationship between PRI and LUE across species. In this study we examined the relationship between the PRI and various photosynthetic parameters for a group of species with varying photosynthetic capacity. At constant irradiance, for the species group as a whole, the PRI was well correlated with LUE (r2=0.58) and with several other photosynthetic parameters, but best correlated with the ratio of carotenoids to chlorophylls contents (Caro / Chl). Despite the interspecific trends observed, determination of light response functions for the PRI in relation to photosynthetic parameters revealed that species-specific relationships were clearly stronger. For example, r2>0.90 for species-level PRI / LUE relationships. Also, the species-specific light-response data show that the magnitude of the PRI can be related to the magnitude of the saturated irradiance and the rate of CO2 uptake. As demonstrated here, a light response function provides a simple yet precise approach for characterising the relationship between the PRI and photosynthetic parameters, which should assist with improved evaluation of the usefulness of the PRI as a generalised measure of LUE.

scholarly journals Potential of Photochemical Reflectance Index for Indicating Photochemistry and Light Use Efficiency in Leaves of European Beech and Norway Spruce Trees

2018 ◽  
Vol 10 (8) ◽  
pp. 1202 ◽  
Author(s):  
Daniel Kováč ◽  
Petra Veselovská ◽  
Karel Klem ◽  
Kristýna Večeřová ◽  
Alexander Ač ◽  
...  
Keyword(s):  
Norway Spruce ◽  
European Beech ◽  
Early Morning ◽  
Photochemical Quenching ◽  
Physiological Status ◽  
Photosynthetic Parameters ◽  
Light Use Efficiency ◽  
Photochemical Reflectance Index ◽  
Temperature Regimes ◽  
Use Efficiency

Hyperspectral reflectance is becoming more frequently used for measuring the functions and productivity of ecosystems. The purpose of this study was to re-evaluate the potential of the photochemical reflectance index (PRI) for evaluating physiological status of plants. This is needed because the reasons for variation in PRI and its relationships to physiological traits remain poorly understood. We examined the relationships between PRI and photosynthetic parameters in evergreen Norway spruce and deciduous European beech grown in controlled conditions during several consecutive periods of 10–12 days between which the irradiance and air temperature were changed stepwise. These regime changes induced significant changes in foliar biochemistry and physiology. The responses of PRI corresponded particularly to alterations in the actual quantum yield of photosystem II photochemistry (ΦPSII). Acclimation responses of both species led to loss of PRI sensitivity to light use efficiency (LUE). The procedure of measuring PRI at multiple irradiance-temperature conditions has been designed also for testing accuracy of ΔPRI in estimating LUE. A correction mechanism of subtracting daily measured PRI from early morning PRI has been performed to account for differences in photosynthetic pigments between irradiance-temperature regimes. Introducing ΔPRI, which provided a better estimate of non-photochemical quenching (NPQ) compared to PRI, also improved the accuracy of LUE estimation. Furthermore, ΔPRI was able to detect the effect of drought, which is poorly observable from PRI.

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