The photochemical reflectance index (PRI) and the remote sensing of leaf, canopy and ecosystem radiation use efficiencies: A review and meta-analysis

[1]  J. Flexas,et al.  Terrestrial Photosynthesis in a Changing Environment: Remote sensing of photosynthesis , 2012 .

[2]  Christopher M. Gough,et al.  Remote sensing of canopy light use efficiency in temperate and boreal forests of North America using MODIS imagery , 2012 .

[3]  Steven F. Oberbauer,et al.  Remote sensing of tundra gross ecosystem productivity and light use efficiency under varying temperature and moisture conditions , 2010 .

[4]  Tiit Nilson,et al.  Responses of the reflectance indices PRI and NDVI to experimental warming and drought in European shrublands along a north-south climatic gradient , 2010 .

[5]  A. Kowalski,et al.  Hidden, abiotic CO2 flows and gaseous reservoirs in the terrestrial carbon cycle: Review and perspectives , 2010 .

[6]  Jonas Ardö,et al.  Patterns and controls of the variability of radiation use efficiency and primary productivity across terrestrial ecosystems , 2010 .

[7]  J. Moreno,et al.  Remote sensing of sun‐induced fluorescence to improve modeling of diurnal courses of gross primary production (GPP) , 2010 .

[8]  Corinne Le Quéré,et al.  Trends in the sources and sinks of carbon dioxide , 2009 .

[9]  Thomas Hilker,et al.  An assessment of photosynthetic light use efficiency from space: Modeling the atmospheric and directional impacts on PRI reflectance , 2009 .

[10]  Zbyněk Malenovský,et al.  Near-distance imaging spectroscopy investigating chlorophyll fluorescence and photosynthetic activity of grassland in the daily course. , 2009, Functional plant biology : FPB.

[11]  Ingo Ensminger,et al.  Biochemical constrains limit the potential of the photochemical reflectance index as a predictor of effective quantum efficiency of photosynthesis during the winter spring transition in Jack pine seedlings. , 2009, Functional plant biology : FPB.

[12]  W. Verhoef,et al.  PROSPECT+SAIL models: A review of use for vegetation characterization , 2009 .

[13]  Thomas Hilker,et al.  Dynamics of spectral bio-indicators and their correlations with light use efficiency using directional observations at a Douglas-fir forest , 2009 .

[14]  Z. Malenovský,et al.  Scientific and technical challenges in remote sensing of plant canopy reflectance and fluorescence. , 2009, Journal of experimental botany.

[15]  Michele Meroni,et al.  Indicators of ozone effects on Fagus sylvatica L. by means of spectroradiometric measurements , 2009 .

[16]  Julie C. Naumann,et al.  Spatial variations in salinity stress across a coastal landscape using vegetation indices derived from hyperspectral imagery , 2009, Plant Ecology.

[17]  Markus Reichstein,et al.  Tracking seasonal drought effects on ecosystem light use efficiency with satellite-based PRI in a Mediterranean forest. , 2009 .

[18]  Michele Meroni,et al.  A flux-based assessment of the effects of ozone on foliar injury, photosynthesis, and yield of bean (Phaseolus vulgaris L. cv. Borlotto Nano Lingua di Fuoco) in open-top chambers. , 2009, Environmental pollution.

[19]  Roberta E. Martin,et al.  Leaf Chemical and Optical Properties of Metrosideros polymorpha Across Environmental Gradients in Hawaii , 2009 .

[20]  J. García-Plazaola,et al.  Distribution and evolutionary trends of photoprotective isoprenoids (xanthophylls and tocopherols) within the plant kingdom. , 2009, Physiologia plantarum.

[21]  Kuan-Ming Lai,et al.  Relationships of photosynthetic capacity to PSII efficiency and to photochemical reflectance index of Pinus taiwanensis through different seasons at high and low elevations of sub-tropical Taiwan , 2009, Trees.

[22]  Thomas Hilker,et al.  Detection of foliage conditions and disturbance from multi-angular high spectral resolution remote sensing , 2009 .

[23]  Zheng Niu,et al.  [Effects of N, K fertilization on the relationship between photosynthetic light use efficiency and photochemical reflectance index (PRI)]. , 2009, Guang pu xue yu guang pu fen xi = Guang pu.

[24]  Thomas Hilker,et al.  Linking foliage spectral responses to canopy-level ecosystem photosynthetic light-use efficiency at a Douglas-fir forest in Canada , 2009 .

[25]  S. Frolking,et al.  Canopy nitrogen, carbon assimilation, and albedo in temperate and boreal forests: Functional relations and potential climate feedbacks , 2008, Proceedings of the National Academy of Sciences.

[26]  J. Peñuelas,et al.  Remote estimation of carbon dioxide uptake by a Mediterranean forest , 2008 .

[27]  Julie C. Naumann,et al.  Linking Physiological Responses, Chlorophyll Fluorescence and Hyperspectral Imagery to Detect Salinity Stress Using the Physiological Reflectance Index in the Coastal Shrub, Myrica cerifera , 2008 .

[28]  Martín F. Garbulsky,et al.  Estimación de la eficiencia del uso de la radiación en bosques mediterráneos a partir de datos MODIS. Uso del Índice de Reflectancia Fotoquímica (PRI) , 2008 .

[29]  M. Rossini,et al.  Leaf level early assessment of ozone injuries by passive fluorescence and photochemical reflectance index , 2008 .

[30]  Stewart B Rood,et al.  Seasonal photosynthetic gas exchange and leaf reflectance characteristics of male and female cottonwoods in a riparian woodland. , 2008, Tree physiology.

[31]  Elizabeth M. Middleton,et al.  Regional mapping of gross light-use efficiency using MODIS spectral indices , 2008 .

[32]  T. A. Black,et al.  Separating physiologically and directionally induced changes in PRI using BRDF models , 2008 .

[33]  M. Schaepman,et al.  Angular sensitivity analysis of vegetation indices derived from CHRIS/PROBA data , 2008 .

[34]  Kenlo Nishida Nasahara,et al.  Utility of spectral vegetation indices for estimation of light conversion efficiency in coniferous forests in Japan , 2008 .

[35]  Julie C. Naumann,et al.  Leaf chlorophyll fluorescence, reflectance, and physiological response to freshwater and saltwater flooding in the evergreen shrub, Myrica cerifera , 2008 .

[36]  W. Oechel,et al.  A new model of gross primary productivity for North American ecosystems based solely on the enhanced vegetation index and land surface temperature from MODIS , 2008 .

[37]  K. Winter,et al.  Lutein epoxide cycle, light harvesting and photoprotection in species of the tropical tree genus Inga. , 2008, Plant, cell & environment.

[38]  Michele Meroni,et al.  Assessing Steady-state Fluorescence and PRI from Hyperspectral Proximal Sensing as Early Indicators of Plant Stress: The Case of Ozone Exposure , 2008, Sensors.

[39]  D. Baldocchi ‘Breathing’ of the terrestrial biosphere: lessons learned from a global network of carbon dioxide flux measurement systems , 2008 .

[40]  Pablo J. Zarco-Tejada,et al.  Assessing Canopy PRI for Water Stress detection with Diurnal Airborne Imagery , 2008 .

[41]  Ismael Moya,et al.  Photochemistry, remotely sensed physiological reflectance index and de-epoxidation state of the xanthophyll cycle in Quercus coccifera under intense drought , 2008, Oecologia.

[42]  J. Peñuelas,et al.  Normalized difference spectral indices for estimating photosynthetic efficiency and capacity at a canopy scale derived from hyperspectral and CO2 flux measurements in rice , 2008 .

[43]  Xulin Guo,et al.  Estimation of grassland CO2 exchange rates using hyperspectral remote sensing techniques , 2008 .

[44]  John R. Miller,et al.  Use of hyperspectral remote sensing to estimate the gross photosynthesis of agricultural fields , 2008, Canadian Journal of Remote Sensing.

[45]  N. Coops,et al.  Multi-Angle Remote Sensing of Forest Light Use Efficiency , 2007 .

[46]  J. V. Soares,et al.  Characterization of pasture biophysical properties and the impact of grazing intensity using remotely sensed data , 2007 .

[47]  Nobuko Saigusa,et al.  Utility of spectral vegetation index for estimation of gross CO2 flux under varied sky conditions , 2007 .

[48]  Mathias Disney,et al.  Can we measure terrestrial photosynthesis from space directly, using spectral reflectance and fluorescence? , 2007 .

[49]  J. Gamon,et al.  Ecological Applications of Remote Sensing at Multiple Scales , 2007 .

[50]  Derek R. Peddle,et al.  Photosynthesis, chlorophyll fluorescence and spectral reflectance in Sphagnum moss at varying water contents , 2007, Oecologia.

[51]  J. Peñuelas,et al.  Seasonal soil VOC exchange rates in a Mediterranean holm oak forest and their responses to drought conditions , 2007 .

[52]  Roberta E. Martin,et al.  Genetic variation in leaf pigment, optical and photosynthetic function among diverse phenotypes of Metrosideros polymorpha grown in a common garden , 2007, Oecologia.

[53]  W. Oechel,et al.  On the use of MODIS EVI to assess gross primary productivity of North American ecosystems , 2006 .

[54]  H. Yamano,et al.  Relating photosynthesis of biological soil crusts with reflectance: preliminary assessment based on a hydration experiment , 2006 .

[55]  Josep Peñuelas,et al.  Relationship between light use efficiency and photochemical reflectance index in soybean leaves as affected by soil water content , 2006 .

[56]  Roberta E. Martin,et al.  Vegetation–Climate Interactions among Native and Invasive Species in Hawaiian Rainforest , 2006, Ecosystems.

[57]  Craig M. Trotter,et al.  Estimating photosynthetic light‐use efficiency using the photochemical reflectance index: the effects of short‐term exposure to elevated CO2 and low temperature , 2006 .

[58]  G. A. Blackburn,et al.  Hyperspectral remote sensing of plant pigments. , 2006, Journal of experimental botany.

[59]  M. Schildhauer,et al.  Spectral Network (SpecNet)—What is it and why do we need it? , 2006 .

[60]  W. Oechel,et al.  Parallel adjustments in vegetation greenness and ecosystem CO2 exchange in response to drought in a Southern California chaparral ecosystem , 2006 .

[61]  John A. Gamon,et al.  Mapping carbon and water vapor fluxes in a chaparral ecosystem using vegetation indices derived from AVIRIS , 2006 .

[62]  Benoit Rivard,et al.  Comparison of spectral indices obtained using multiple spectroradiometers , 2006 .

[63]  Chung‐Ping Lin,et al.  Seasonal variation in photosystem II efficiency and photochemical reflectance index of evergreen trees and perennial grasses growing at low and high elevations in subtropical Taiwan. , 2006, Tree physiology.

[64]  Mathew R. Schwaller,et al.  On the blending of the Landsat and MODIS surface reflectance: predicting daily Landsat surface reflectance , 2006, IEEE Transactions on Geoscience and Remote Sensing.

[65]  W. Cohen,et al.  Evaluation of fraction of absorbed photosynthetically active radiation products for different canopy radiation transfer regimes: methodology and results using Joint Research Center products derived from SeaWiFS against ground-based estimations. , 2006 .

[66]  Dirk Pflugmacher,et al.  Numerical Terradynamic Simulation Group 7-2006 MODIS land cover and LAI Collection 4 product quality across nine sites in the western hemisphere , 2018 .

[67]  J. -H. Weng,et al.  Down-regulation of photosystem 2 efficiency and spectral reflectance in mango leaves under very low irradiance and varied chilling treatments , 2006, Photosynthetica.

[68]  A. Viña,et al.  Relationship between gross primary production and chlorophyll content in crops: Implications for the synoptic monitoring of vegetation productivity , 2006 .

[69]  J. Weng,et al.  Relationships between chlorophyll fluorescence parameters and photochemical reflectance index of tree species adapted to different temperature regimes. , 2006, Functional plant biology : FPB.

[70]  Hiroyuki Oguma,et al.  Seasonal changes in the relationship between photochemical reflectance index and photosynthetic light use efficiency of Japanese larch needles , 2006 .

[71]  John A. Gamon,et al.  Diverse Optical and Photosynthetic Properties in a Neotropical Dry Forest during the Dry Season: Implications for Remote Estimation of Photosynthesis 1 , 2005 .

[72]  T. A. Black,et al.  A MODIS-derived photochemical reflectance index to detect inter-annual variations in the photosynthetic light-use efficiency of a boreal deciduous forest , 2005 .

[73]  T. Vesala,et al.  On the separation of net ecosystem exchange into assimilation and ecosystem respiration: review and improved algorithm , 2005 .

[74]  Pablo J. Zarco-Tejada,et al.  Simple reflectance indices track heat and water stress-induced changes in steady-state chlorophyll fluorescence at the canopy scale , 2005 .

[75]  L. Alonso,et al.  Remote sensing of sunlight-induced chlorophyll fluorescence and reflectance of Scots pine in the boreal forest during spring recovery , 2005 .

[76]  D. Whitehead,et al.  Photosynthesis and reflectance indices for rainforest species in ecosystems undergoing progression and retrogression along a soil fertility chronosequence in New Zealand , 2005, Oecologia.

[77]  A. Isoda,et al.  Adaptive Responses of Soybean and Cotton to Water Stress: I. Transpiration Changes in Relation to Stomatal Area and Stomatal Conductance , 2005 .

[78]  A. Isoda,et al.  Adaptive Responses of Soybean and Cotton to Water Stress II. Changes in CO2 Assimilation Rate, Chlorophyll Fluorescence and Photochemical Reflectance Index in Relation to Leaf Temperature , 2005 .

[79]  José M. Paruelo,et al.  Remote sensing of protected areas to derive baseline vegetation functioning characteristics , 2004 .

[80]  R. Fensholt,et al.  Evaluation of MODIS LAI, fAPAR and the relation between fAPAR and NDVI in a semi-arid environment using in situ measurements , 2004 .

[81]  Maosheng Zhao,et al.  A Continuous Satellite-Derived Measure of Global Terrestrial Primary Production , 2004 .

[82]  Ismael Moya,et al.  A new instrument for passive remote sensing: 2. Measurement of leaf and canopy reflectance changes at 531 nm and their relationship with photosynthesis and chlorophyll fluorescence , 2004 .

[83]  Craig M. Trotter,et al.  Estimating photosynthetic light-use efficiency using the photochemical reflectance index: variations among species. , 2004, Functional plant biology : FPB.

[84]  Hans Peter Schmid,et al.  Potential of MODIS ocean bands for estimating CO2 flux from terrestrial vegetation: A novel approach , 2004 .

[85]  G. Asner,et al.  Drought stress and carbon uptake in an Amazon forest measured with spaceborne imaging spectroscopy. , 2004, Proceedings of the National Academy of Sciences of the United States of America.

[86]  Iolanda Filella,et al.  Reflectance assessment of seasonal and annual changes in biomass and CO2 uptake of a Mediterranean shrubland submitted to experimental warming and drought , 2004 .

[87]  J. Peñuelas,et al.  Leaf reflectance and photo‐ and antioxidant protection in field‐grown summer‐stressed Phillyrea angustifolia. Optical signals of oxidative stress? , 2004 .

[88]  Qifa Zhou,et al.  Leaf and spike reflectance spectra of rice with contrasting nitrogen supplemental levels , 2003 .

[89]  A. Arneth,et al.  Remote sensing of photosynthetic-light-use efficiency of a Siberian boreal forest , 2002 .

[90]  Sharon A. Robinson,et al.  Surface reflectance properties of Antarctic moss and their relationship to plant species, pigment composition and photosynthetic function , 2002 .

[91]  J. Peñuelas,et al.  Linking photorespiration, monoterpenes and thermotolerance in Quercus , 2002 .

[92]  D. Sims,et al.  Relationships between leaf pigment content and spectral reflectance across a wide range of species, leaf structures and developmental stages , 2002 .

[93]  T. Winkel,et al.  Radiation Use Efficiency, Chlorophyll Fluorescence, and Reflectance Indices Associated with Ontogenic Changes in Water-Limited Chenopodium quinoa Leaves , 2002, Photosynthetica.

[94]  W. Oechel,et al.  Seasonal patterns of reflectance indices, carotenoid pigments and photosynthesis of evergreen chaparral species , 2002, Oecologia.

[95]  Elizabeth Pattey,et al.  Impact of nitrogen and environmental conditions on corn as detected by hyperspectral reflectance , 2002 .

[96]  Andrew D Richardson,et al.  Changes in foliar spectral reflectance and chlorophyll fluorescence of four temperate species following branch cutting. , 2002, Tree physiology.

[97]  José Luis Araus,et al.  Photoprotection in water-stressed plants of durum wheat (Triticum turgidum var. durum): changes in chlorophyll fluorescence, spectral signature and photosynthetic pigments. , 2002, Functional plant biology : FPB.

[98]  D. Whitehead,et al.  The photochemical reflectance index as a measure of photosynthetic light use efficiency for plants with varying foliar nitrogen contents , 2002 .

[99]  Dar A. Roberts,et al.  Modeling spatially distributed ecosystem flux of boreal forest using hyperspectral indices from AVIRIS imagery , 2001 .

[100]  P. North,et al.  Remote sensing of canopy light use efficiency using the photochemical reflectance index , 2001 .

[101]  Qingquan Li,et al.  Current progress on multisensor image fusion in remote sensing , 2001, International Symposium on Multispectral Image Processing and Pattern Recognition.

[102]  A. Richardson,et al.  Spectral reflectance of Picea rubens (Pinaceae) and Abies balsamea (Pinaceae) needles along an elevational gradient, Mt. Moosilauke, New Hampshire, USA. , 2001, American journal of botany.

[103]  Franco Miglietta,et al.  Effects of lifelong (CO2) enrichment on carboxylation and light utilization of Quercus pubescens Willd. examined with gas exchange, biochemistry and optical techniques , 2000 .

[104]  M. Méthy Analysis of Photosynthetic Activity at the Leaf and Canopy Levels from Reflectance Measurements: A Case Study , 2000, Photosynthetica.

[105]  A. K. Mitchell,et al.  Differentiation among effects of nitrogen fertilization treatments on conifer seedlings by foliar reflectance: a comparison of methods. , 2000, Tree physiology.

[106]  Ü. Rannik,et al.  Respiration as the main determinant of carbon balance in European forests , 2000, Nature.

[107]  T. A. Black,et al.  Remote sensing of photosynthetic-light-use efficiency of boreal forest , 2000 .

[108]  Y. Inoue,et al.  Reflectance assessment of canopy CO2 uptake , 2000 .

[109]  S. Rambal,et al.  Remote Sensing of Canopy Photosynthetic Performances: Two Complementary Ways for Assessing the Photochemical Reflectance Index , 1999, Photosynthetica.

[110]  John A. Gamon,et al.  Assessing leaf pigment content and activity with a reflectometer , 1999 .

[111]  K. Niyogi,et al.  PHOTOPROTECTION REVISITED: Genetic and Molecular Approaches. , 1999, Annual review of plant physiology and plant molecular biology.

[112]  A. I. Vinogradov Comparison of spectra , 1999 .

[113]  G. Asner Biophysical and Biochemical Sources of Variability in Canopy Reflectance , 1998 .

[114]  Josep Peñuelas,et al.  Visible and near-infrared reflectance techniques for diagnosing plant physiological status , 1998 .

[115]  Josep Peñuelas,et al.  Comparative field study of spring and summer leaf gas exchange and photobiology of the mediterranean trees Quercus ilex and Phillyrea latifolia , 1998 .

[116]  J. Gamon,et al.  The photochemical reflectance index: an optical indicator of photosynthetic radiation use efficiency across species, functional types, and nutrient levels , 1997, Oecologia.

[117]  Christopher B. Field,et al.  ASSESSING PHOTOSYNTHETIC RADIATION-USE EFFICIENCY OF EMERGENT AQUATIC VEGETATION FROM SPECTRAL REFLECTANCE , 1997 .

[118]  J. Peñuelas,et al.  Photochemical reflectance index and leaf photosynthetic radiation-use-efficiency assessment in Mediterranean trees , 1997 .

[119]  R. Waring,et al.  A generalised model of forest productivity using simplified concepts of radiation-use efficiency, carbon balance and partitioning , 1997 .

[120]  John Moncrieff,et al.  The propagation of errors in long‐term measurements of land‐atmosphere fluxes of carbon and water , 1996 .

[121]  J. Peñuelas,et al.  Relationship between photosynthetic radiation-use efficiency of barley canopies and the photochemical reflectance index (PRI) , 1996 .

[122]  J. Peñuelas,et al.  Assessment of photosynthetic radiation‐use efficiency with spectral reflectance , 1995 .

[123]  Ranga B. Myneni,et al.  Potential gross primary productivity of terrestrial vegetation from 1982 - 1990 , 1995 .

[124]  C. Field,et al.  Relationships Between NDVI, Canopy Structure, and Photosynthesis in Three Californian Vegetation Types , 1995 .

[125]  Ernst-Detlef Schulze,et al.  Ecophysiology of Photosynthesis , 1995, Springer Study Edition.

[126]  Christopher B. Field,et al.  Reflectance indices associated with physiological changes in nitrogen- and water-limited sunflower leaves☆ , 1994 .

[127]  Richard H. Waring,et al.  Environmental Limits on Net Primary Production and Light‐Use Efficiency Across the Oregon Transect , 1994 .

[128]  Gérard Dedieu,et al.  Methodology for the estimation of terrestrial net primary production from remotely sensed data , 1994 .

[129]  Christopher B. Field,et al.  Functional patterns in an annual grassland during an AVIRIS overflight , 1993 .

[130]  C. Field,et al.  A narrow-waveband spectral index that tracks diurnal changes in photosynthetic efficiency , 1992 .

[131]  Christopher B. Field,et al.  Remote sensing of the xanthophyll cycle and chlorophyll fluorescence in sunflower leaves and canopies , 1990, Oecologia.

[132]  Ramakrishna R. Nemani,et al.  Relating seasonal patterns of the AVHRR vegetation index to simulated photosynthesis and transpiration of forests in different climates , 1988 .

[133]  R. Colwell Remote sensing of the environment , 1980, Nature.

[134]  J. Monteith Climate and the efficiency of crop production in Britain , 1977 .

[135]  A. Kowalski,et al.  Hidden , abiotic CO 2 flows and gaseous reservoirs in the terrestrial carbon cycle : review and perspectives , 2010 .

[136]  A. Harris,et al.  Spectral reflectance and photosynthetic properties of Sphagnum mosses exposed to progressive drought , 2008 .

[137]  International Journal of Remote Sensing , 2008 .

[138]  C. Small,et al.  Monitoring Spatio-temporal Dynamics of Photosynthesis with a Portable Hyperspectral Imaging System , 2007 .

[139]  J. Peñuelas,et al.  Seasonal soil and leaf CO 2 exchange rates in a Mediterranean holm oak forest and their responses to drought conditions , 2007 .

[140]  Huang Jingfeng,et al.  Estimating Pigment Contents in Leaves and Panicles of Rice after Milky Ripening by Hyperspectral Vegetation Indices , 2006 .

[141]  I. Pippi,et al.  Estimation of vegetation photochemical processes: an application of the Photochemical Reflectance Index at the San Rossore test site. , 2005 .

[142]  Uwe Rascher,et al.  Assessing photosynthetic efficiency in an experimental mangrove canopy using remote sensing and chlorophyll fluorescence , 2005, Trees.

[143]  Josep Peñuelas,et al.  Assessing forest structure and function from spectral transmittance measurements: a case study in a Mediterranean holm oak forest. , 2005, Tree physiology.

[144]  Christopher B. Field,et al.  Assessing photosynthetic downregulation in sunflower stands with an optically-based model , 2004, Photosynthesis Research.

[145]  I. Moyaa,et al.  A new instrument for passive remote sensing : 2 . Measurement of leaf and canopy reflectance changes at 531 nm and their relationship with photosynthesis and chlorophyll fluorescence , 2004 .

[146]  J. Peñuelas,et al.  Comparative seasonal gas exchange and chlorophyll fluorescence of two dominant woody species in a Holm Oak Forest , 2003 .

[147]  C. V. M. Bartona,et al.  Remote sensing of canopy light use efficiency using the photochemical reflectance index Model and sensitivity analysis , 2000 .

[148]  Christine Pohl,et al.  Multisensor image fusion in remote sensing: concepts, methods and applications , 1998 .

[149]  G. Carter Reflectance Wavebands and Indices for Remote Estimation of Photosynthesis and Stomatal Conductance in Pine Canopies , 1998 .

[150]  B. Demmig‐Adams,et al.  The role of xanthophyll cycle carotenoids in the protection of photosynthesis , 1996 .

[151]  J. Randerson,et al.  Global net primary production: Combining ecology and remote sensing , 1995 .

[152]  Christopher B. Field,et al.  2 – Ecological Scaling of Carbon Gain to Stress and Resource Availability , 1991 .

[153]  The American Journal of Botany , 1914, Science.

[154]  J. Peñuelas Re ectance assessment of canopy CO 2 uptake , 2022 .