Using Near-Infrared-Enabled Digital Repeat Photography to Track Structural and Physiological Phenology in Mediterranean Tree–Grass Ecosystems
Abstract
Tree–grass ecosystems are widely distributed. However, their phenology has not yet been fully characterized. The technique of repeated digital photographs for plant phenology monitoring (hereafter referred as PhenoCam) provide opportunities for long-term monitoring of plant phenology, and extracting phenological transition dates (PTDs, e.g., start of the growing season). Here, we aim to evaluate the utility of near-infrared-enabled PhenoCam for monitoring the phenology of structure (i.e., greenness) and physiology (i.e., gross primary productivity—GPP) at four tree–grass Mediterranean sites. We computed four vegetation indexes (VIs) from PhenoCams: (1) green chromatic coordinates (GCC), (2) normalized difference vegetation index (CamNDVI), (3) near-infrared reflectance of vegetation index (CamNIRv), and (4) ratio vegetation index (CamRVI). GPP is derived from eddy covariance flux tower measurement. Then, we extracted PTDs and their uncertainty from different VIs and GPP. The consistency between structural (VIs) and physiological (GPP) phenology was then evaluated. CamNIRv is best at representing the PTDs of GPP during the Green-up period, while CamNDVI is best during the Dry-down period. Moreover, CamNIRv outperforms the other VIs in tracking growing season length of GPP. In summary, the results show it is promising to track structural and physiology phenology of seasonally dry Mediterranean ecosystem using near-infrared-enabled PhenoCam. We suggestmore »
- Authors:
-
- Max-Planck-Inst. for Biogeochemistry, Jena (Germany). Dept. for Biogeochemical Integration
- Environmental Protection Agency of Aosta Valley, Aosta (Italy)
- Fundación Centro de Estudios Ambientales del Mediterráneo (CEAM), Paterna (Spain)
- National Inst. for Agriculture and Food Research and Technology (INIA), Madrid (Spain). Dept. of Environment
- Max-Planck-Inst. for Biogeochemistry, Jena (Germany). Dept. for Biogeochemical Integration; Spanish National Research Council (CSIC), Madrid (Spain). Environmental Remote Sensing and Spectroscopy Lab. (SpecLab)
- Spanish National Research Council (CSIC), Madrid (Spain). Environmental Remote Sensing and Spectroscopy Lab. (SpecLab)
- Univ. of Extremadura, Plasencia (Spain). Inst. for Dehesa Research
- Max-Planck-Inst. for Biogeochemistry, Jena (Germany). Dept. for Biogeochemical Integration; Michael-Stifel-Center Jena for Data-Driven and Simulation Science, Jena (Germany)
- Harvard Univ., Cambridge, MA (United States). Dept. of Organismic and Evolutionary Biology; Northern Arizona Univ., Flagstaff, AZ (United States). School of Informatics, Computing and Cyber Systems; Northern Arizona Univ., Flagstaff, AZ (United States). Center for Ecosystem Science and Society
- Friedrich Schiller Univ., Jena (Germany). Inst. of Ecology and Evolution, Plant Biodiversity Group; German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig (Germany)
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1499900
- Grant/Contract Number:
- SC0016011
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Remote Sensing
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 8; Journal ID: ISSN 2072-4292
- Publisher:
- MDPI
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION
Citation Formats
Luo, Yunpeng, El-Madany, Tarek S., Filippa, Gianluca, Ma, Xuanlong, Ahrens, Bernhard, Carrara, Arnaud, Gonzalez-Cascon, Rosario, Cremonese, Edoardo, Galvagno, Marta, Hammer, Tiana W., Pacheco-Labrador, Javier, Martín, M. Pilar, Moreno, Gerardo, Perez-Priego, Oscar, Reichstein, Markus, Richardson, Andrew D., Römermann, Christine, and Migliavacca, Mirco. Using Near-Infrared-Enabled Digital Repeat Photography to Track Structural and Physiological Phenology in Mediterranean Tree–Grass Ecosystems. United States: N. p., 2018.
Web. doi:10.3390/rs10081293.
Luo, Yunpeng, El-Madany, Tarek S., Filippa, Gianluca, Ma, Xuanlong, Ahrens, Bernhard, Carrara, Arnaud, Gonzalez-Cascon, Rosario, Cremonese, Edoardo, Galvagno, Marta, Hammer, Tiana W., Pacheco-Labrador, Javier, Martín, M. Pilar, Moreno, Gerardo, Perez-Priego, Oscar, Reichstein, Markus, Richardson, Andrew D., Römermann, Christine, & Migliavacca, Mirco. Using Near-Infrared-Enabled Digital Repeat Photography to Track Structural and Physiological Phenology in Mediterranean Tree–Grass Ecosystems. United States. https://doi.org/10.3390/rs10081293
Luo, Yunpeng, El-Madany, Tarek S., Filippa, Gianluca, Ma, Xuanlong, Ahrens, Bernhard, Carrara, Arnaud, Gonzalez-Cascon, Rosario, Cremonese, Edoardo, Galvagno, Marta, Hammer, Tiana W., Pacheco-Labrador, Javier, Martín, M. Pilar, Moreno, Gerardo, Perez-Priego, Oscar, Reichstein, Markus, Richardson, Andrew D., Römermann, Christine, and Migliavacca, Mirco. Wed .
"Using Near-Infrared-Enabled Digital Repeat Photography to Track Structural and Physiological Phenology in Mediterranean Tree–Grass Ecosystems". United States. https://doi.org/10.3390/rs10081293. https://www.osti.gov/servlets/purl/1499900.
@article{osti_1499900,
title = {Using Near-Infrared-Enabled Digital Repeat Photography to Track Structural and Physiological Phenology in Mediterranean Tree–Grass Ecosystems},
author = {Luo, Yunpeng and El-Madany, Tarek S. and Filippa, Gianluca and Ma, Xuanlong and Ahrens, Bernhard and Carrara, Arnaud and Gonzalez-Cascon, Rosario and Cremonese, Edoardo and Galvagno, Marta and Hammer, Tiana W. and Pacheco-Labrador, Javier and Martín, M. Pilar and Moreno, Gerardo and Perez-Priego, Oscar and Reichstein, Markus and Richardson, Andrew D. and Römermann, Christine and Migliavacca, Mirco},
abstractNote = {Tree–grass ecosystems are widely distributed. However, their phenology has not yet been fully characterized. The technique of repeated digital photographs for plant phenology monitoring (hereafter referred as PhenoCam) provide opportunities for long-term monitoring of plant phenology, and extracting phenological transition dates (PTDs, e.g., start of the growing season). Here, we aim to evaluate the utility of near-infrared-enabled PhenoCam for monitoring the phenology of structure (i.e., greenness) and physiology (i.e., gross primary productivity—GPP) at four tree–grass Mediterranean sites. We computed four vegetation indexes (VIs) from PhenoCams: (1) green chromatic coordinates (GCC), (2) normalized difference vegetation index (CamNDVI), (3) near-infrared reflectance of vegetation index (CamNIRv), and (4) ratio vegetation index (CamRVI). GPP is derived from eddy covariance flux tower measurement. Then, we extracted PTDs and their uncertainty from different VIs and GPP. The consistency between structural (VIs) and physiological (GPP) phenology was then evaluated. CamNIRv is best at representing the PTDs of GPP during the Green-up period, while CamNDVI is best during the Dry-down period. Moreover, CamNIRv outperforms the other VIs in tracking growing season length of GPP. In summary, the results show it is promising to track structural and physiology phenology of seasonally dry Mediterranean ecosystem using near-infrared-enabled PhenoCam. We suggest using multiple VIs to better represent the variation of GPP.},
doi = {10.3390/rs10081293},
journal = {Remote Sensing},
number = 8,
volume = 10,
place = {United States},
year = {Wed Aug 15 00:00:00 EDT 2018},
month = {Wed Aug 15 00:00:00 EDT 2018}
}
Web of Science
Works referenced in this record:
Greenness indices from digital cameras predict the timing and seasonal dynamics of canopy-scale photosynthesis
journal, January 2015
- Toomey, Michael; Friedl, Mark A.; Frolking, Steve
- Ecological Applications, Vol. 25, Issue 1
Walter’s two-layer hypothesis revisited: back to the roots!
journal, December 2012
- Ward, David; Wiegand, Kerstin; Getzin, Stephan
- Oecologia, Vol. 172, Issue 3
Influence of spring phenology on seasonal and annual carbon balance in two contrasting New England forests
journal, January 2009
- Richardson, A. D.; Hollinger, D. Y.; Dail, D. B.
- Tree Physiology, Vol. 29, Issue 3
Productivity of North American grasslands is increased under future climate scenarios despite rising aridity
journal, February 2016
- Hufkens, Koen; Keenan, Trevor F.; Flanagan, Lawrence B.
- Nature Climate Change, Vol. 6, Issue 7
Phenopix: A R package for image-based vegetation phenology
journal, April 2016
- Filippa, Gianluca; Cremonese, Edoardo; Migliavacca, Mirco
- Agricultural and Forest Meteorology, Vol. 220
Fire in Australian savannas: from leaf to landscape
journal, September 2014
- Beringer, Jason; Hutley, Lindsay B.; Abramson, David
- Global Change Biology, Vol. 21, Issue 1
Evaluation of eddy covariance latent heat fluxes with independent lysimeter and sapflow estimates in a Mediterranean savannah ecosystem
journal, April 2017
- Perez-Priego, Oscar; El-Madany, Tarek S.; Migliavacca, Mirco
- Agricultural and Forest Meteorology, Vol. 236
Sonic Anemometer Tilt Correction Algorithms
journal, April 2001
- Wilczak, James M.; Oncley, Steven P.; Stage, Steven A.
- Boundary-Layer Meteorology, Vol. 99, Issue 1
Review: Development of an in situ observation network for terrestrial ecological remote sensing: the Phenological Eyes Network (PEN)
journal, January 2015
- Nasahara, Kenlo Nishida; Nagai, Shin
- Ecological Research, Vol. 30, Issue 2
Use of digital cameras for phenological observations
journal, September 2010
- Ide, Reiko; Oguma, Hiroyuki
- Ecological Informatics, Vol. 5, Issue 5
Influence of spring and autumn phenological transitions on forest ecosystem productivity
journal, October 2010
- Richardson, Andrew D.; Andy Black, T.; Ciais, Philippe
- Philosophical Transactions of the Royal Society B: Biological Sciences, Vol. 365, Issue 1555
Near-surface remote sensing of spatial and temporal variation in canopy phenology
journal, September 2009
- Richardson, Andrew D.; Braswell, Bobby H.; Hollinger, David Y.
- Ecological Applications, Vol. 19, Issue 6
Digital repeat photography for phenological research in forest ecosystems
journal, January 2012
- Sonnentag, Oliver; Hufkens, Koen; Teshera-Sterne, Cory
- Agricultural and Forest Meteorology, Vol. 152
Influence of physiological phenology on the seasonal pattern of ecosystem respiration in deciduous forests
journal, August 2014
- Migliavacca, Mirco; Reichstein, Markus; Richardson, Andrew D.
- Global Change Biology, Vol. 21, Issue 1
Amazon drought and forest response: Largely reduced forest photosynthesis but slightly increased canopy greenness during the extreme drought of 2015/2016
journal, February 2018
- Yang, Jia; Tian, Hanqin; Pan, Shufen
- Global Change Biology, Vol. 24, Issue 5
Linking near-surface and satellite remote sensing measurements of deciduous broadleaf forest phenology
journal, February 2012
- Hufkens, Koen; Friedl, Mark; Sonnentag, Oliver
- Remote Sensing of Environment, Vol. 117
Seasonal and annual variation of carbon exchange in an evergreen Mediterranean forest in southern France: CO2 FLUXES OF A MEDITERRANEAN FOREST
journal, January 2008
- Allard, V.; Ourcival, J. M.; Rambal, S.
- Global Change Biology, Vol. 14, Issue 4
Codominant water control on global interannual variability and trends in land surface phenology and greenness
journal, June 2015
- Forkel, Matthias; Migliavacca, Mirco; Thonicke, Kirsten
- Global Change Biology, Vol. 21, Issue 9
On the uncertainty of phenological responses to climate change, and implications for a terrestrial biosphere model
journal, January 2012
- Migliavacca, M.; Sonnentag, O.; Keenan, T. F.
- Biogeosciences, Vol. 9, Issue 6
Net carbon uptake has increased through warming-induced changes in temperate forest phenology
journal, June 2014
- Keenan, Trevor F.; Gray, Josh; Friedl, Mark A.
- Nature Climate Change, Vol. 4, Issue 7
Growing season changes in the last century
journal, March 2006
- Linderholm, Hans W.
- Agricultural and Forest Meteorology, Vol. 137, Issue 1-2
Interpreting canopy development and physiology using a European phenology camera network at flux sites
journal, January 2015
- Wingate, L.; Ogée, J.; Cremonese, E.
- Biogeosciences, Vol. 12, Issue 20
Modelling vegetation greenness responses to climate variability in a Mediterranean terrestrial ecosystem
journal, November 2007
- Diodato, Nazzareno; Bellocchi, Gianni
- Environmental Monitoring and Assessment, Vol. 143, Issue 1-3
Spatio-Temporal Relationships between Optical Information and Carbon Fluxes in a Mediterranean Tree-Grass Ecosystem
journal, June 2017
- Pacheco-Labrador, Javier; El-Madany, Tarek; Martín, M.
- Remote Sensing, Vol. 9, Issue 6
Plant functional traits and canopy structure control the relationship between photosynthetic CO 2 uptake and far-red sun-induced fluorescence in a Mediterranean grassland under different nutrient availability
journal, February 2017
- Migliavacca, Mirco; Perez-Priego, Oscar; Rossini, Micol
- New Phytologist, Vol. 214, Issue 3
A 500 year pheno-climatological view on the 2003 heatwave in Europe assessed by grape harvest dates [A 500 year pheno-climatological view on the 2003 heatwave in Europe assessed by grape harvest dates]
journal, March 2005
- Menzel, Annette
- Meteorologische Zeitschrift, Vol. 14, Issue 1
Beyond leaf color: Comparing camera-based phenological metrics with leaf biochemical, biophysical, and spectral properties throughout the growing season of a temperate deciduous forest: Seasonality of leaf properties
journal, March 2014
- Yang, Xi; Tang, Jianwu; Mustard, John F.
- Journal of Geophysical Research: Biogeosciences, Vol. 119, Issue 3
European phenological response to climate change matches the warming pattern
journal, October 2006
- Menzel, Annette; Sparks, Tim H.; Estrella, Nicole
- Global Change Biology, Vol. 12, Issue 10
Inter-annual variability in carbon dioxide exchange of an oak/grass savanna and open grassland in California
journal, December 2007
- Ma, Siyan; Baldocchi, Dennis D.; Xu, Liukang
- Agricultural and Forest Meteorology, Vol. 147, Issue 3-4
Monitoring vegetation phenology using an infrared-enabled security camera
journal, September 2014
- Petach, Anika R.; Toomey, Michael; Aubrecht, Donald M.
- Agricultural and Forest Meteorology, Vol. 195-196
How plant functional-type, weather, seasonal drought, and soil physical properties alter water and energy fluxes of an oak–grass savanna and an annual grassland
journal, May 2004
- Baldocchi, Dennis D.; Xu, Liukang; Kiang, Nancy
- Agricultural and Forest Meteorology, Vol. 123, Issue 1-2
Landscape controls on the timing of spring, autumn, and growing season length in mid-Atlantic forests
journal, September 2011
- Elmore, Andrew J.; Guinn, Steven M.; Minsley, Burke J.
- Global Change Biology, Vol. 18, Issue 2
A system to measure surface fluxes of momentum, sensible heat, water vapour and carbon dioxide
journal, February 1997
- Moncrieff, J. B.; Massheder, J. M.; de Bruin, H.
- Journal of Hydrology, Vol. 188-189
Systematic assessment of terrestrial biogeochemistry in coupled climate-carbon models
journal, October 2009
- Randerson, James T.; Hoffman, Forrest M.; Thornton, Peter E.
- Global Change Biology, Vol. 15, Issue 10
Emerging opportunities and challenges in phenology: a review
journal, August 2016
- Tang, Jianwu; Körner, Christian; Muraoka, Hiroyuki
- Ecosphere, Vol. 7, Issue 8
Using phenocams to monitor our changing Earth: toward a global phenocam network
journal, March 2016
- Brown, Tim B.; Hultine, Kevin R.; Steltzer, Heidi
- Frontiers in Ecology and the Environment, Vol. 14, Issue 2
Drivers of spatio-temporal variability of carbon dioxide and energy fluxes in a Mediterranean savanna ecosystem
journal, November 2018
- El-Madany, Tarek S.; Reichstein, Markus; Perez-Priego, Oscar
- Agricultural and Forest Meteorology, Vol. 262
Photoperiod sensitivity of bud burst in 14 temperate forest tree species
journal, November 2012
- Basler, David; Körner, Christian
- Agricultural and Forest Meteorology, Vol. 165
Using digital cameras for comparative phenological monitoring in an evergreen broad-leaved forest and a seasonal rain forest
journal, July 2012
- Zhao, Junbin; Zhang, Yiping; Tan, Zhenghong
- Ecological Informatics, Vol. 10
An extended approach for spatiotemporal gapfilling: dealing with large and systematic gaps in geoscientific datasets
journal, January 2014
- v. Buttlar, J.; Zscheischler, J.; Mahecha, M. D.
- Nonlinear Processes in Geophysics, Vol. 21, Issue 1
Quality analysis applied on eddy covariance measurements at complex forest sites using footprint modelling
journal, November 2004
- Rebmann, C.; Göckede, M.; Foken, T.
- Theoretical and Applied Climatology, Vol. 80, Issue 2-4
A continental phenology model for monitoring vegetation responses to interannual climatic variability
journal, June 1997
- White, Michael A.; Thornton, Peter E.; Running, Steven W.
- Global Biogeochemical Cycles, Vol. 11, Issue 2
Public Internet-connected cameras used as a cross-continental ground-based plant phenology monitoring system: PUBLIC CAMERAS AS PHENOLOGY MONITORING SYSTEM
journal, January 2010
- Graham, Eric A.; Riordan, Erin C.; Yuen, Eric M.
- Global Change Biology
Declining global warming effects on the phenology of spring leaf unfolding
journal, September 2015
- Fu, Yongshuo H.; Zhao, Hongfang; Piao, Shilong
- Nature, Vol. 526, Issue 7571
Tree–grass phenology information improves light use efficiency modelling of gross primary productivity for an Australian tropical savanna
journal, January 2017
- Moore, Caitlin E.; Beringer, Jason; Evans, Bradley
- Biogeosciences, Vol. 14, Issue 1
Seasonal variations of leaf and canopy properties tracked by ground-based NDVI imagery in a temperate forest
journal, April 2017
- Yang, Hualei; Yang, Xi; Heskel, Mary
- Scientific Reports, Vol. 7, Issue 1
Applicability of Green-Red Vegetation Index for Remote Sensing of Vegetation Phenology
journal, October 2010
- Motohka, Takeshi; Nasahara, Kenlo Nishida; Oguma, Hiroyuki
- Remote Sensing, Vol. 2, Issue 10
Towards a standardized processing of Net Ecosystem Exchange measured with eddy covariance technique: algorithms and uncertainty estimation
journal, January 2006
- Papale, D.; Reichstein, M.; Aubinet, M.
- Biogeosciences, Vol. 3, Issue 4
Evaluation of Vegetation Indices and a Modified Simple Ratio for Boreal Applications
journal, September 1996
- Chen, Jing M.
- Canadian Journal of Remote Sensing, Vol. 22, Issue 3
Validating satellite phenology through intensive ground observation and landscape scaling in a mixed seasonal forest
journal, January 2011
- Liang, Liang; Schwartz, Mark D.; Fei, Songlin
- Remote Sensing of Environment, Vol. 115, Issue 1
Development of a two-band enhanced vegetation index without a blue band
journal, October 2008
- Jiang, Z.; Huete, A.; Didan, K.
- Remote Sensing of Environment, Vol. 112, Issue 10
Vegetation phenology from Sentinel-2 and field cameras for a Dutch barrier island
journal, September 2018
- Vrieling, Anton; Meroni, Michele; Darvishzadeh, Roshanak
- Remote Sensing of Environment, Vol. 215
On the separation of net ecosystem exchange into assimilation and ecosystem respiration: review and improved algorithm
journal, September 2005
- Reichstein, Markus; Falge, Eva; Baldocchi, Dennis
- Global Change Biology, Vol. 11, Issue 9
Comparison of different vegetation indices for the remote assessment of green leaf area index of crops
journal, December 2011
- Viña, Andrés; Gitelson, Anatoly A.; Nguy-Robertson, Anthony L.
- Remote Sensing of Environment, Vol. 115, Issue 12
NDVI derived from near-infrared-enabled digital cameras: Applicability across different plant functional types
journal, February 2018
- Filippa, Gianluca; Cremonese, Edoardo; Migliavacca, Mirco
- Agricultural and Forest Meteorology, Vol. 249
Temperature extremes: Effect on plant growth and development
journal, December 2015
- Hatfield, Jerry L.; Prueger, John H.
- Weather and Climate Extremes, Vol. 10
Productivity and carbon fluxes of tropical savannas
journal, March 2006
- Grace, John; Jose, Jose San; Meir, Patrick
- Journal of Biogeography, Vol. 33, Issue 3
A simple ecohydrological model captures essentials of seasonal leaf dynamics in semi-arid tropical grasslands
journal, January 2010
- Choler, P.; Sea, W.; Briggs, P.
- Biogeosciences, Vol. 7, Issue 3
Monitoring multi-layer canopy spring phenology of temperate deciduous and evergreen forests using low-cost spectral sensors
journal, June 2014
- Ryu, Youngryel; Lee, Galam; Jeon, Soohyun
- Remote Sensing of Environment, Vol. 149
Using digital repeat photography and eddy covariance data to model grassland phenology and photosynthetic CO2 uptake
journal, October 2011
- Migliavacca, Mirco; Galvagno, Marta; Cremonese, Edoardo
- Agricultural and Forest Meteorology, Vol. 151, Issue 10
Impact of stand density on water status and leaf gas exchange in Quercus ilex
journal, January 2008
- Moreno, Gerardo; Cubera, Elena
- Forest Ecology and Management, Vol. 254, Issue 1
Phenology Feedbacks on Climate Change
journal, May 2009
- Penuelas, J.; Rutishauser, T.; Filella, I.
- Science, Vol. 324, Issue 5929
Application of chlorophyll-related vegetation indices for remote estimation of maize productivity
journal, September 2011
- Peng, Yi; Gitelson, Anatoly A.
- Agricultural and Forest Meteorology, Vol. 151, Issue 9
Albedo estimates for land surface models and support for a new paradigm based on foliage nitrogen concentration
journal, February 2010
- Hollinger, D. Y.; Ollinger, S. V.; Richardson, A. D.
- Global Change Biology, Vol. 16, Issue 2
Terrestrial biosphere models need better representation of vegetation phenology: results from the North American Carbon Program Site Synthesis
journal, November 2011
- Richardson, Andrew D.; Anderson, Ryan S.; Arain, M. Altaf
- Global Change Biology, Vol. 18, Issue 2
Canopy near-infrared reflectance and terrestrial photosynthesis
journal, March 2017
- Badgley, Grayson; Field, Christopher B.; Berry, Joseph A.
- Science Advances, Vol. 3, Issue 3
Climate change, phenology, and phenological control of vegetation feedbacks to the climate system
journal, February 2013
- Richardson, Andrew D.; Keenan, Trevor F.; Migliavacca, Mirco
- Agricultural and Forest Meteorology, Vol. 169
The impact of growing-season length variability on carbon assimilation and evapotranspiration over 88 years in the eastern US deciduous forest
journal, February 1999
- White, M. A.; Running, S. W.; Thornton, P. E.
- International Journal of Biometeorology, Vol. 42, Issue 3
Tracking forest phenology and seasonal physiology using digital repeat photography: a critical assessment
journal, September 2014
- Keenan, T. F.; Darby, B.; Felts, E.
- Ecological Applications, Vol. 24, Issue 6
Using data from Landsat, MODIS, VIIRS and PhenoCams to monitor the phenology of California oak/grass savanna and open grassland across spatial scales
journal, May 2017
- Liu, Yan; Hill, Michael J.; Zhang, Xiaoyang
- Agricultural and Forest Meteorology, Vol. 237-238
Interspecific competition induces asymmetrical rooting profile adjustments in shrub-encroached open oak woodlands
journal, January 2012
- Rolo, V.; Moreno, G.
- Trees, Vol. 26, Issue 3
Spatial analysis of growing season length control over net ecosystem exchange
journal, October 2005
- Churkina, Galina; Schimel, David; Braswell, Bobby H.
- Global Change Biology, Vol. 11, Issue 10
Evaluating remote sensing of deciduous forest phenology at multiple spatial scales using PhenoCam imagery
journal, January 2014
- Klosterman, S. T.; Hufkens, K.; Gray, J. M.
- Biogeosciences, Vol. 11, Issue 16
Basic and extensible post-processing of eddy covariance flux data with REddyProc
journal, January 2018
- Wutzler, Thomas; Lucas-Moffat, Antje; Migliavacca, Mirco
- Biogeosciences, Vol. 15, Issue 16
An extended approach for spatiotemporal gapfilling: dealing with large and systematic gaps in geoscientific datasets
text, January 2014
- Von Buttlar, Jannis; Zscheischler, Jakob; Mahecha, Miguel D.
- ETH Zurich
Walter's two-layer hypothesis revisited - back to the roots!
journal, May 2013
- Ward, D.; Wiegand, K.; Getzin, S.
- South African Journal of Botany, Vol. 86
Interpreting canopy development and physiology using a European phenology camera network at flux sites
text, January 2015
- Wingate, Lisa; Ogée, Jérôme; Cremonese, Edoardo
- ETH Zurich
Phenology Feedbacks on Climate Change
text, January 2009
- Peñuelas, Josep; Rutishauser, This; Filella, Iollanda
- American Association for the Advancement of Science
Walter’s two-layer hypothesis revisited: back to the roots!
journal, December 2012
- Ward, David; Wiegand, Kerstin; Getzin, Stephan
- Oecologia, Vol. 172, Issue 3
Quality analysis applied on eddy covariance measurements at complex forest sites using footprint modelling
journal, November 2004
- Rebmann, C.; Göckede, M.; Foken, T.
- Theoretical and Applied Climatology, Vol. 80, Issue 2-4
Review: Development of an in situ observation network for terrestrial ecological remote sensing: the Phenological Eyes Network (PEN)
journal, January 2015
- Nasahara, Kenlo Nishida; Nagai, Shin
- Ecological Research, Vol. 30, Issue 2
How plant functional-type, weather, seasonal drought, and soil physical properties alter water and energy fluxes of an oak–grass savanna and an annual grassland
journal, May 2004
- Baldocchi, Dennis D.; Xu, Liukang; Kiang, Nancy
- Agricultural and Forest Meteorology, Vol. 123, Issue 1-2
Growing season changes in the last century
journal, March 2006
- Linderholm, Hans W.
- Agricultural and Forest Meteorology, Vol. 137, Issue 1-2
Application of chlorophyll-related vegetation indices for remote estimation of maize productivity
journal, September 2011
- Peng, Yi; Gitelson, Anatoly A.
- Agricultural and Forest Meteorology, Vol. 151, Issue 9
Monitoring vegetation phenology using an infrared-enabled security camera
journal, September 2014
- Petach, Anika R.; Toomey, Michael; Aubrecht, Donald M.
- Agricultural and Forest Meteorology, Vol. 195-196
Drivers of spatio-temporal variability of carbon dioxide and energy fluxes in a Mediterranean savanna ecosystem
journal, November 2018
- El-Madany, Tarek S.; Reichstein, Markus; Perez-Priego, Oscar
- Agricultural and Forest Meteorology, Vol. 262
Use of digital cameras for phenological observations
journal, September 2010
- Ide, Reiko; Oguma, Hiroyuki
- Ecological Informatics, Vol. 5, Issue 5
Comparison of different vegetation indices for the remote assessment of green leaf area index of crops
journal, December 2011
- Viña, Andrés; Gitelson, Anatoly A.; Nguy-Robertson, Anthony L.
- Remote Sensing of Environment, Vol. 115, Issue 12
Vegetation phenology from Sentinel-2 and field cameras for a Dutch barrier island
journal, September 2018
- Vrieling, Anton; Meroni, Michele; Darvishzadeh, Roshanak
- Remote Sensing of Environment, Vol. 215
Temperature extremes: Effect on plant growth and development
journal, December 2015
- Hatfield, Jerry L.; Prueger, John H.
- Weather and Climate Extremes, Vol. 10
Influence of spring and autumn phenological transitions on forest ecosystem productivity
journal, October 2010
- Richardson, Andrew D.; Andy Black, T.; Ciais, Philippe
- Philosophical Transactions of the Royal Society B: Biological Sciences, Vol. 365, Issue 1555
Fire in Australian savannas: from leaf to landscape
journal, September 2014
- Beringer, Jason; Hutley, Lindsay B.; Abramson, David
- Global Change Biology, Vol. 21, Issue 1
Warm Winter, Wet Spring, and an Extreme Response in Ecosystem Functioning on the Iberian Peninsula
journal, January 2018
- Sippel, Sebastian; El-Madany, Tarek S.; Migliavacca, Mirco
- Bulletin of the American Meteorological Society, Vol. 99, Issue 1
Near-surface remote sensing of spatial and temporal variation in canopy phenology
journal, September 2009
- Richardson, Andrew D.; Braswell, Bobby H.; Hollinger, David Y.
- Ecological Applications, Vol. 19, Issue 6
An extended approach for spatiotemporal gapfilling: dealing with large and systematic gaps in geoscientific datasets
text, January 2014
- Von Buttlar, Jannis; Zscheischler, Jakob; Mahecha, Miguel D.
- ETH Zurich
Towards a standardized processing of Net Ecosystem Exchange measured with eddy covariance technique: algorithms and uncertainty estimation
journal, January 2006
- Papale, D.; Reichstein, M.; Aubinet, M.
- Biogeosciences, Vol. 3, Issue 4
On the uncertainty of phenological responses to climate change, and implications for a terrestrial biosphere model
journal, January 2012
- Migliavacca, M.; Sonnentag, O.; Keenan, T. F.
- Biogeosciences, Vol. 9, Issue 6
Evaluating remote sensing of deciduous forest phenology at multiple spatial scales using PhenoCam imagery
journal, January 2014
- Klosterman, S. T.; Hufkens, K.; Gray, J. M.
- Biogeosciences Discussions, Vol. 11, Issue 2
Phenology Feedbacks on Climate Change
text, January 2009
- Peñuelas, Josep; Rutishauser, This; Filella, Iollanda
- American Association for the Advancement of Science
Works referencing / citing this record:
Fate of N additions in a multiple resource‐limited Mediterranean oak savanna
journal, November 2019
- Morris, Kendalynn A.; Nair, Richard K. F.; Moreno, Gerardo
- Ecosphere, Vol. 10, Issue 11
Tracking seasonal rhythms of plants in diverse ecosystems with digital camera imagery
journal, December 2018
- Richardson, Andrew D.
- New Phytologist, Vol. 222, Issue 4
Improving the Performance of 3-D Radiative Transfer Model FLIGHT to Simulate Optical Properties of a Tree-Grass Ecosystem
journal, December 2018
- Melendo-Vega, José; Martín, M.; Pacheco-Labrador, Javier
- Remote Sensing, Vol. 10, Issue 12
Correction: Luo, Y.P. et al., Using Near-Infrared Enabled Digital Repeat Photography to Track Structural and Physiological Phenology in Mediterranean Tree-Grass Ecosystems. Remote Sens. 2018, 10, 1293.
journal, March 2019
- Luo, Yunpeng; El-Madany, Tarek; Filippa, Gianluca
- Remote Sensing, Vol. 11, Issue 6
Evaluating the Effectiveness of Using Vegetation Indices Based on Red-Edge Reflectance from Sentinel-2 to Estimate Gross Primary Productivity
journal, May 2019
- Lin, Shangrong; Li, Jing; Liu, Qinhuo
- Remote Sensing, Vol. 11, Issue 11
Radiometric Calibration of ‘Commercial off the Shelf’ Cameras for UAV-Based High-Resolution Temporal Crop Phenotyping of Reflectance and NDVI
journal, July 2019
- Holman, Fenner H.; Riche, Andrew B.; Castle, March
- Remote Sensing, Vol. 11, Issue 14
N : P stoichiometry and habitat effects on Mediterranean savanna seasonal root dynamics
journal, January 2019
- Nair, Richard K. F.; Morris, Kendalynn A.; Hertel, Martin
- Biogeosciences, Vol. 16, Issue 9
senSCOPE: Modeling mixed canopies combining green and brown senesced leaves. Evaluation in a Mediterranean Grassland
journal, May 2021
- Pacheco-Labrador, Javier; El-Madany, Tarek S.; van der Tol, Christiaan
- Remote Sensing of Environment, Vol. 257
Evaluating the Effectiveness of Using Vegetation Indices Based on Red-Edge Reflectance from Sentinel-2 to Estimate Gross Primary Productivity
journal, May 2019
- Lin, Shangrong; Li, Jing; Liu, Qinhuo
- Remote Sensing, Vol. 11, Issue 11
Monitoring Grass Phenology and Hydrological Dynamics of an Oak–Grass Savanna Ecosystem Using Sentinel-2 and Terrestrial Photography
journal, February 2020
- Gómez-Giráldez, Pedro J.; Pérez-Palazón, María J.; Polo, María J.
- Remote Sensing, Vol. 12, Issue 4
Plant Traits Help Explain the Tight Relationship between Vegetation Indices and Gross Primary Production
journal, April 2020
- Hinojo-Hinojo, César; Goulden, Michael L.
- Remote Sensing, Vol. 12, Issue 9
Comparison of Landsat and Land-Based Phenology Camera Normalized Difference Vegetation Index (NDVI) for Dominant Plant Communities in the Great Basin
journal, March 2019
- Snyder, Keirith; Huntington, Justin; Wehan, Bryce
- Sensors, Vol. 19, Issue 5