Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Survey data on Dutch farmers’ perceived resilience, risk management, risk preferences, and risk perceptions
    Slijper, H.T. ; Mey, Y. de; Poortvliet, P.M. ; Gielen-Meuwissen, M.P.M. - \ 2021
    farmers - resilience - robustness - adaptability - transformability - risk management - risk preferences - risk perceptions - risk behaviour
    This dataset contains data on Dutch farmers’ perceived resilience, risk management, risk preferences, and risk perceptions. It contains cleaned survey data from 926 Dutch farmers.
    The FLUXNET2015 dataset and the ONEFlux processing pipeline for eddy covariance data
    Pastorello, Gilberto ; Trotta, Carlo ; Canfora, Eleonora ; Chu, Housen ; Christianson, Danielle ; Cheah, You Wei ; Poindexter, Cristina ; Chen, Jiquan ; Elbashandy, Abdelrahman ; Humphrey, Marty ; Isaac, Peter ; Polidori, Diego ; Ribeca, Alessio ; Ingen, Catharine van; Zhang, Leiming ; Amiro, Brian ; Ammann, Christof ; Arain, M.A. ; Ardö, Jonas ; Arkebauer, Timothy ; Arndt, Stefan K. ; Arriga, Nicola ; Aubinet, Marc ; Aurela, Mika ; Baldocchi, Dennis ; Barr, Alan ; Beamesderfer, Eric ; Marchesini, Luca Belelli ; Bergeron, Onil ; Beringer, Jason ; Bernhofer, Christian ; Berveiller, Daniel ; Billesbach, Dave ; Black, Thomas Andrew ; Blanken, Peter D. ; Bohrer, Gil ; Boike, Julia ; Bolstad, Paul V. ; Bonal, Damien ; Bonnefond, Jean Marc ; Bowling, David R. ; Bracho, Rosvel ; Brodeur, Jason ; Brümmer, Christian ; Buchmann, Nina ; Burban, Benoit ; Burns, Sean P. ; Buysse, Pauline ; Cale, Peter ; Cavagna, Mauro ; Cellier, Pierre ; Chen, Shiping ; Chini, Isaac ; Christensen, Torben R. ; Cleverly, James ; Collalti, Alessio ; Consalvo, Claudia ; Cook, Bruce D. ; Cook, David ; Coursolle, Carole ; Cremonese, Edoardo ; Curtis, Peter S. ; Andrea, Ettore D'; Rocha, Humberto da; Dai, Xiaoqin ; Davis, Kenneth J. ; Cinti, Bruno De; Grandcourt, Agnes de; Ligne, Anne De; Oliveira, Raimundo C. De; Delpierre, Nicolas ; Desai, Ankur R. ; Bella, Carlos Marcelo Di; Tommasi, Paul di; Dolman, Han ; Domingo, Francisco ; Dong, Gang ; Dore, Sabina ; Duce, Pierpaolo ; Dufrêne, Eric ; Dunn, Allison ; Dušek, Jiří ; Eamus, Derek ; Eichelmann, Uwe ; ElKhidir, Hatim Abdalla M. ; Eugster, Werner ; Ewenz, Cacilia M. ; Ewers, Brent ; Famulari, Daniela ; Fares, Silvano ; Feigenwinter, Iris ; Feitz, Andrew ; Fensholt, Rasmus ; Filippa, Gianluca ; Fischer, Marc ; Frank, John ; Galvagno, Marta ; Gharun, Mana ; Gianelle, Damiano ; Gielen, Bert ; Gioli, Beniamino ; Gitelson, Anatoly ; Goded, Ignacio ; Goeckede, Mathias ; Goldstein, Allen H. ; Gough, Christopher M. ; Goulden, Michael L. ; Graf, Alexander ; Griebel, Anne ; Gruening, Carsten ; Grünwald, Thomas ; Hammerle, Albin ; Han, Shijie ; Han, Xingguo ; Hansen, Birger Ulf ; Hanson, Chad ; Hatakka, Juha ; He, Yongtao ; Hehn, Markus ; Heinesch, Bernard ; Hinko-Najera, Nina ; Hörtnagl, Lukas ; Hutley, Lindsay ; Ibrom, Andreas ; Ikawa, Hiroki ; Jackowicz-Korczynski, Marcin ; Janouš, Dalibor ; Jans, Wilma ; Jassal, Rachhpal ; Jiang, Shicheng ; Kato, Tomomichi ; Khomik, Myroslava ; Klatt, Janina ; Knohl, Alexander ; Knox, Sara ; Kobayashi, Hideki ; Koerber, Georgia ; Kolle, Olaf ; Kosugi, Yoshiko ; Kotani, Ayumi ; Kowalski, Andrew ; Kruijt, Bart ; Kurbatova, Julia ; Kutsch, Werner L. ; Kwon, Hyojung ; Launiainen, Samuli ; Laurila, Tuomas ; Law, Bev ; Leuning, Ray ; Li, Yingnian ; Liddell, Michael ; Limousin, Jean Marc ; Lion, Marryanna ; Liska, Adam J. ; Lohila, Annalea ; López-Ballesteros, Ana ; López-Blanco, Efrén ; Loubet, Benjamin ; Loustau, Denis ; Lucas-Moffat, Antje ; Lüers, Johannes ; Ma, Siyan ; Macfarlane, Craig ; Magliulo, Vincenzo ; Maier, Regine ; Mammarella, Ivan ; Manca, Giovanni ; Marcolla, Barbara ; Margolis, Hank A. ; Marras, Serena ; Massman, William ; Mastepanov, Mikhail ; Matamala, Roser ; Matthes, Jaclyn Hatala ; Mazzenga, Francesco ; McCaughey, Harry ; McHugh, Ian ; McMillan, Andrew M.S. ; Merbold, Lutz ; Meyer, Wayne ; Meyers, Tilden ; Miller, Scott D. ; Minerbi, Stefano ; Moderow, Uta ; Monson, Russell K. ; Montagnani, Leonardo ; Moore, Caitlin E. ; Moors, Eddy ; Moreaux, Virginie ; Moureaux, Christine ; Munger, J.W. ; Nakai, Taro ; Neirynck, Johan ; Nesic, Zoran ; Nicolini, Giacomo ; Noormets, Asko ; Northwood, Matthew ; Nosetto, Marcelo ; Nouvellon, Yann ; Novick, Kimberly ; Oechel, Walter ; Olesen, Jørgen Eivind ; Ourcival, Jean Marc ; Papuga, Shirley A. ; Parmentier, Frans Jan ; Paul-Limoges, Eugenie ; Pavelka, Marian ; Peichl, Matthias ; Pendall, Elise ; Phillips, Richard P. ; Pilegaard, Kim ; Pirk, Norbert ; Posse, Gabriela ; Powell, Thomas ; Prasse, Heiko ; Prober, Suzanne M. ; Rambal, Serge ; Rannik, Üllar ; Raz-Yaseef, Naama ; Reed, David ; Dios, Victor Resco de; Restrepo-Coupe, Natalia ; Reverter, Borja R. ; Roland, Marilyn ; Sabbatini, Simone ; Sachs, Torsten ; Saleska, Scott R. ; Sánchez-Cañete, Enrique P. ; Sanchez-Mejia, Zulia M. ; Schmid, Hans Peter ; Schmidt, Marius ; Schneider, Karl ; Schrader, Frederik ; Schroder, Ivan ; Scott, Russell L. ; Sedlák, Pavel ; Serrano-Ortíz, Penélope ; Shao, Changliang ; Shi, Peili ; Shironya, Ivan ; Siebicke, Lukas ; Šigut, Ladislav ; Silberstein, Richard ; Sirca, Costantino ; Spano, Donatella ; Steinbrecher, Rainer ; Stevens, Robert M. ; Sturtevant, Cove ; Suyker, Andy ; Tagesson, Torbern ; Takanashi, Satoru ; Tang, Yanhong ; Tapper, Nigel ; Thom, Jonathan ; Tiedemann, Frank ; Tomassucci, Michele ; Tuovinen, Juha Pekka ; Urbanski, Shawn ; Valentini, Riccardo ; Molen, Michiel van der; Gorsel, Eva van; Huissteden, Ko van; Varlagin, Andrej ; Verfaillie, Joseph ; Vesala, Timo ; Vincke, Caroline ; Vitale, Domenico ; Vygodskaya, Natalia ; Walker, Jeffrey P. ; Walter-Shea, Elizabeth ; Wang, Huimin ; Weber, Robin ; Westermann, Sebastian ; Wille, Christian ; Wofsy, Steven ; Wohlfahrt, Georg ; Wolf, Sebastian ; Woodgate, William ; Li, Yuelin ; Zampedri, Roberto ; Zhang, Junhui ; Zhou, Guoyi ; Zona, Donatella ; Agarwal, Deb ; Biraud, Sebastien ; Torn, Margaret ; Papale, Dario - \ 2020
    Scientific Data 7 (2020)1. - ISSN 2052-4463 - 1 p.

    The FLUXNET2015 dataset provides ecosystem-scale data on CO2, water, and energy exchange between the biosphere and the atmosphere, and other meteorological and biological measurements, from 212 sites around the globe (over 1500 site-years, up to and including year 2014). These sites, independently managed and operated, voluntarily contributed their data to create global datasets. Data were quality controlled and processed using uniform methods, to improve consistency and intercomparability across sites. The dataset is already being used in a number of applications, including ecophysiology studies, remote sensing studies, and development of ecosystem and Earth system models. FLUXNET2015 includes derived-data products, such as gap-filled time series, ecosystem respiration and photosynthetic uptake estimates, estimation of uncertainties, and metadata about the measurements, presented for the first time in this paper. In addition, 206 of these sites are for the first time distributed under a Creative Commons (CC-BY 4.0) license. This paper details this enhanced dataset and the processing methods, now made available as open-source codes, making the dataset more accessible, transparent, and reproducible.

    Eindrapportage Grondig boeren voor Water
    Korevaar, H. ; Gielen, J. ; Bos, A.J. ; Domhof, B. ; Essen, Everhard van; Brink, Cors van den - \ 2019
    Royal Haskoning - 57 p.
    Tussenevaluatie Grondig boeren voor Water : Fase 2: 2017-2018
    Korevaar, H. ; Gielen, Jaap ; Bos, Albert-Jan ; Bos, Bianca ; Essen, Everhard van; Brink, Cors van den - \ 2019
    Groningen : Royal Haskoning - 48 p.
    ‘Vergroening chemische industrie vereist radicale keuzes’: hernieuwbare grondstoffen, maar ook nieuwe processen
    Sanders, J.P.M. - \ 2019
    biobased economy - chemical industry - netherlands - innovation adoption - renewable energy - biomass
    ‘Biobased is al lang volwassen’ : Jacco van Haveren
    Haveren, J. van - \ 2018
    biobased economy - industry - biobased materials - innovations - research - biomass - bioplastics - fibres

    De biobased economie klein? Daar klopt niks van, als je het Jacco van Haveren vraagt. Hij is Programmamanager Biobased Chemicaliën en Brandstoffen bij Wageningen UR Food & Biobased Research. 'Kijk maar eens om je heen; qua volume zijn er nu al veel meer biobased materialen, dan materialen gebaseerd op aardolie.'

    Prediction of photosynthesis in Scots pine ecosystems across Europe by a needle-level theory
    Hari, Pertti ; Noe, Steffen ; Dengel, Sigrid ; Elbers, Jan ; Gielen, Bert ; Kerminen, Veli-Matti ; Kruijt, Bart ; Kulmala, Liisa ; Lindroth, Anders ; Mammarella, Ivan ; Petäjä, Tuukka ; Schurgers, Guy ; Vanhatalo, Anni ; Kulmala, Markku ; Bäck, Jaana - \ 2018
    Atmospheric Chemistry and Physics 18 (2018)18. - ISSN 1680-7316 - p. 13321 - 13328.

    Photosynthesis provides carbon for the synthesis of macromolecules to construct cells during growth. This is the basis for the key role of photosynthesis in the carbon dynamics of ecosystems and in the biogenic CO2 assimilation. The development of eddy-covariance (EC) measurements for ecosystem CO2 fluxes started a new era in the field studies of photosynthesis. However, the interpretation of the very variable CO2 fluxes in evergreen forests has been problematic especially in transition times such as the spring and autumn. We apply two theoretical needle-level equations that connect the variation in the light intensity, stomatal action and the annual metabolic cycle of photosynthesis. We then use these equations to predict the photosynthetic CO2 flux in five Scots pine stands located from the northern timberline to Central Europe. Our result has strong implications for our conceptual understanding of the effects of the global change on the processes in boreal forests, especially of the changes in the metabolic annual cycle of photosynthesis.

    BEN: Bedrijfsspecifieke bemesting met kunstmeststikstof : resultaten 2014 en 2016
    Verloop, Koos ; Hilhorst, Gerjan ; Oenema, Jouke ; Gielen, Jaap - \ 2018
    Wageningen : Wageningen Livestock Research (Rapport / Koeien en kansen nr. 81) - 28
    Christiaan Bolck (Biobased Performance Materials): ‘We doen onderzoek dat impact heeft’
    Bolck, C.H. - \ 2018
    biobased economy - biobased materials - biomass - polymers - bioplastics - dyes - pigments - paints - plant extracts
    Evaluatie Grondig boeren voor Water : Fase 1: 2016 – 2017
    Korevaar, H. ; Gielen, J. ; Bos, A.J. ; Domhof, B. ; Essen, E. van; Brink, C. van den - \ 2017
    Royal Haskoning (WATBE5408R001F0.1. ) - 24 p.
    Landbouw en drinkwaterwinning kunnen goed samengaan
    Brink, C. van den; Verloop, K. ; Gielen, J. ; Pasman, W. - \ 2017
    H2O : tijdschrift voor watervoorziening en afvalwaterbehandeling (2017)10. - ISSN 0166-8439 - p. 42 - 43.
    Sinds de jaren zeventig van de vorige eeuw zijn steeds meer mineralen en bestrijdingsmiddelen in het grondwater terechtgekomen. Ondanks de inzet van overheid, agrarische sector en drinkwaterbedrijven om het gebruik – en daarmee ook de uitspoeling – van deze stoffen te verminderen, is de belasting van het grondwater nog steeds te hoog. Daarom is in Overijssel in 2010 afgesproken de belasting van de meest kwetsbare drinkwaterwinningen te verminderen met het project ‘Boeren voor Drinkwater’.
    Landbouw en drinkwaterwinning kunnen goed samengaan
    Brink, C. van den; Verloop, J. ; Gielen, J. ; Pasman, W. - \ 2017
    H2O online (2017)6 september. - 9
    In het project ‘Boeren voor Drinkwater’ werken melkveehouders sinds 2010 samen met onder andere de provincie Overijssel en drinkwaterbedrijf Vitens aan het verminderen van de milieubelasting op het grondwater in de meest kwetsbare zandgebieden. Hoewel nog niet overal de doelstelling voor nitraatuitspoeling gehaald wordt, is bij de deelnemers al een aanzienlijke vermindering bereikt. Het project laat zien dat een efficiëntere mineralenkringloop leidt tot minder milieubelasting en hand in hand gaat met een verbeterd economisch rendement. Om de drinkwaterwinning veilig te stellen is het echter nodig de mineralenbenutting in (vrijwel) het gehele intrekgebied te optimaliseren.
    Associations between maternal long-chain polyunsaturated fatty acid concentrations and child cognition at 7 years of age: The MEFAB birth cohort
    Brouwer, E.M. ; Rest, O. van de; Godschalk, B. ; Zeegers, M.P.A. ; Gielen, M. ; Groot, R.H.M. de - \ 2017
    Prostaglandins Leukotrienes and Essential Fatty Acids 126 (2017). - ISSN 0952-3278 - p. 92 - 97.
    Introduction Concentrations of the fish fatty acids EPA and DHA are low among Dutch women of reproductive age. As the human brain incorporates high concentrations of these fatty acids in utero, particularly during third trimester of gestation, these low EPA and DHA concentrations may have adverse consequences for fetal brain development and functioning. Methods Analyses were conducted using longitudinal observational data of 292 mother-child pairs participating in the MEFAB cohort. Maternal AA, DHA, and EPA were determined in plasma phospholipids - obtained in three trimesters - by gas-liquid chromatography. Cognitive function was assessed at 7 years of age, using the Kaufman Assessment Battery for Children, resulting in three main outcome parameters: sequential processing (short-term memory), simultaneous processing (problem-solving skills), and the mental processing composite score. Spline regression and linear regression analyses were used to analyse the data, while adjusting for potential relevant covariates. Results Only 2% of the children performed more than one SD below the mental processing composite norm score. Children with lower test scores (<25%) were more likely to have a younger mother with a higher pre-gestational BMI, less likely to be breastfed, and more likely to be born with a lower birth weight, compared to children with higher test scores (≥25%). Fully-adjusted linear regression models did not show associations of maternal AA, DHA, or EPA status during any of the pregnancy trimesters with childhood sequential and simultaneous processing. Conclusion Maternal fatty acid status during pregnancy was not associated with cognitive performance in Dutch children at age 7.
    Estimation of high-resolution terrestrial evapotranspiration from Landsat data using a simple Taylor skill fusion method
    Yao, Yunjun ; Liang, Shunlin ; Li, Xianglan ; Zhang, Yuhu ; Chen, Jiquan ; Jia, Kun ; Zhang, Xiaotong ; Fisher, Joshua B. ; Wang, Xuanyu ; Zhang, Lilin ; Xu, Jia ; Shao, Changliang ; Posse, Gabriela ; Li, Yingnian ; Magliulo, Vincenzo ; Varlagin, Andrej ; Moors, Eddy J. ; Boike, Julia ; Macfarlane, Craig ; Kato, Tomomichi ; Buchmann, Nina ; Billesbach, D.P. ; Beringer, Jason ; Wolf, Sebastian ; Papuga, Shirley A. ; Wohlfahrt, Georg ; Montagnani, Leonardo ; Ardö, Jonas ; Paul-Limoges, Eugénie ; Emmel, Carmen ; Hörtnagl, Lukas ; Sachs, Torsten ; Gruening, Carsten ; Gioli, Beniamino ; López-Ballesteros, Ana ; Steinbrecher, Rainer ; Gielen, Bert - \ 2017
    Journal of Hydrology 553 (2017). - ISSN 0022-1694 - p. 508 - 526.
    Eddy covariance - Fusion method - High-resolution products - Landsat data - Terrestrial evapotranspiration

    Estimation of high-resolution terrestrial evapotranspiration (ET) from Landsat data is important in many climatic, hydrologic, and agricultural applications, as it can help bridging the gap between existing coarse-resolution ET products and point-based field measurements. However, there is large uncertainty among existing ET products from Landsat that limit their application. This study presents a simple Taylor skill fusion (STS) method that merges five Landsat-based ET products and directly measured ET from eddy covariance (EC) to improve the global estimation of terrestrial ET. The STS method uses a weighted average of the individual ET products and weights are determined by their Taylor skill scores (S). The validation with site-scale measurements at 206 EC flux towers showed large differences and uncertainties among the five ET products. The merged ET product exhibited the best performance with a decrease in the averaged root-mean-square error (RMSE) by 2–5 W/m2 when compared to the individual products. To evaluate the reliability of the STS method at the regional scale, the weights of the STS method for these five ET products were determined using EC ground-measurements. An example of regional ET mapping demonstrates that the STS-merged ET can effectively integrate the individual Landsat ET products. Our proposed method provides an improved high-resolution ET product for identifying agricultural crop water consumption and providing a diagnostic assessment for global land surface models.

    BEN: Bedrijfsspecifieke bemesting met kunstmest stikstof : resultaten 2014 en 2015
    Verloop, Koos ; Hilhorst, Gerjan ; Oenema, Jouke ; Gielen, Jaap - \ 2017
    Wageningen : Wageningen UR Livestock Research (Rapport / Koeien en kansen nr. 77) - 38
    melkveehouderij - bemesting - kunstmeststoffen - stikstof - graslanden - akkerbouw - wetgeving - nederland - dairy farming - fertilizer application - fertilizers - nitrogen - grasslands - arable farming - legislation - netherlands
    Trends in soil solution dissolved organic carbon (DOC) concentrations across European forests
    Camino-Serrano, Marta ; Graf Pannatier, Elisabeth ; Vicca, Sara ; Luyssaert, Sebastiaan ; Jonard, Mathieu ; Ciais, Philippe ; Guenet, Bertrand ; Gielen, Bert ; Peñuelas, Josep ; Sardans, Jordi ; Waldner, Peter ; Sawicka, Kasia - \ 2016
    Biogeosciences 13 (2016)19. - ISSN 1726-4170 - p. 5567 - 5585.

    Dissolved organic carbon (DOC) in surface waters is connected to DOC in soil solution through hydrological pathways. Therefore, it is expected that long-term dynamics of DOC in surface waters reflect DOC trends in soil solution. However, a multitude of site studies have failed so far to establish consistent trends in soil solution DOC, whereas increasing concentrations in European surface waters over the past decades appear to be the norm, possibly as a result of recovery from acidification. The objectives of this study were therefore to understand the long-term trends of soil solution DOC from a large number of European forests (ICP Forests Level II plots) and determine their main physicochemical and biological controls. We applied trend analysis at two levels: (1) to the entire European dataset and (2) to the individual time series and related trends with plot characteristics, i.e., soil and vegetation properties, soil solution chemistry and atmospheric deposition loads. Analyses of the entire dataset showed an overall increasing trend in DOC concentrations in the organic layers, but, at individual plots and depths, there was no clear overall trend in soil solution DOC. The rate change in soil solution DOC ranged between-16.8 and +23%yr-1 (median=+0.4%yr-1 across Europe. The non-significant trends (40 %) outnumbered the increasing (35 %) and decreasing trends (25 %) across the 97 ICP Forests Level II sites. By means of multivariate statistics, we found increasing trends in DOC concentrations with increasing mean nitrate (NO3 -) deposition and increasing trends in DOC concentrations with decreasing mean sulfate (SO2- 4) deposition, with the magnitude of these relationships depending on plot deposition history. While the attribution of increasing trends in DOC to the reduction of SO2- 4 deposition could be confirmed in low to medium N deposition areas, in agreement with observations in surface waters, this was not the case in high N deposition areas. In conclusion, longterm trends of soil solution DOC reflected the interactions between controls acting at local (soil and vegetation properties) and regional (atmospheric deposition of SO2- 4 and inorganic N) scales.

    Sex hormone-binding globulin regulation of androgen bioactivity in vivo : Validation of the free hormone hypothesis
    Laurent, Michaël R. ; Hammond, Geoffrey L. ; Blokland, Marco ; Jardí, Ferran ; Antonio, Leen ; Dubois, Vanessa ; Khalil, Rougin ; Sterk, Saskia S. ; Gielen, Evelien ; Decallonne, Brigitte ; Carmeliet, Geert ; Kaufman, Jean Marc ; Fiers, Tom ; Huhtaniemi, Ilpo T. ; Vanderschueren, Dirk ; Claessens, Frank - \ 2016
    Scientific Reports 6 (2016). - ISSN 2045-2322

    Sex hormone-binding globulin (SHBG) is the high-affinity binding protein for androgens and estrogens. According to the free hormone hypothesis, SHBG modulates the bioactivity of sex steroids by limiting their diffusion into target tissues. Still, the in vivo physiological role of circulating SHBG remains unclear, especially since mice and rats lack circulating SHBG post-natally. To test the free hormone hypothesis in vivo, we examined total and free sex steroid concentrations and bioactivity on target organs in mice expressing a human SHBG transgene. SHBG increased total androgen and estrogen concentrations via hypothalamic-pituitary feedback regulation and prolonged ligand half-life. Despite markedly raised total sex steroid concentrations, free testosterone was unaffected while sex steroid bioactivity on male and female reproductive organs was attenuated. This occurred via a ligand-dependent, genotype-independent mechanism according to in vitro seminal vesicle organ cultures. These results provide compelling support for the determination of free or bioavailable sex steroid concentrations in medicine, and clarify important comparative differences between translational mouse models and human endocrinology.

    Rainfall interception and the coupled surface water and energy balance
    Dijk, Albert I.J.M. Van; Gash, John H. ; Gorsel, Eva Van; Blanken, Peter D. ; Cescatti, Alessandro ; Emmel, Carmen ; Gielen, Bert ; Harman, Ian N. ; Kiely, Gerard ; Merbold, Lutz ; Montagnani, Leonardo ; Moors, Eddy ; Sottocornola, Matteo ; Varlagin, Andrej ; Williams, Christopher A. ; Wohlfahrt, Georg - \ 2015
    Agricultural and Forest Meteorology 214-215 (2015). - ISSN 0168-1923 - p. 402 - 415.
    Evapotranspiration - FLUXNET - Penman-Monteith theory - Rainfall interception - Water use - Wet canopy evaporation

    Evaporation from wet canopies (. E) can return up to half of incident rainfall back into the atmosphere and is a major cause of the difference in water use between forests and short vegetation. Canopy water budget measurements often suggest values of E during rainfall that are several times greater than those predicted from Penman-Monteith theory. Our literature review identified potential issues with both estimation approaches, producing several hypotheses that were tested using micrometeorological observations from 128 FLUXNET sites world-wide. The analysis shows that FLUXNET eddy-covariance measurements tend to provide unreliable measurements of E during rainfall. However, the other micrometeorological FLUXNET observations do provide clues as to why conventional Penman-Monteith applications underestimate E. Aerodynamic exchange rather than radiation often drives E during rainfall, and hence errors in air humidity measurement and aerodynamic conductance calculation have considerable impact. Furthermore, evaporative cooling promotes a downwards heat flux from the air aloft as well as from the biomass and soil; energy sources that are not always considered. Accounting for these factors leads to E estimates and modelled interception losses that are considerably higher. On the other hand, canopy water budget measurements can lead to overestimates of E due to spatial sampling errors in throughfall and stemflow, underestimation of canopy rainfall storage capacity, and incorrect calculation of rainfall duration. There are remaining questions relating to horizontal advection from nearby dry areas, infrequent large-scale turbulence under stable atmospheric conditions, and the possible mechanical removal of splash droplets by such eddies. These questions have implications for catchment hydrology, rainfall recycling, land surface modelling, and the interpretation of eddy-covariance measurements.

    Remote sensing of annual terrestrial gross primary productivity from MODIS: an assessment using the FLUXNET La Thuile data set
    Verma, M. ; Friedl, M.A. ; Richardson, A.D. ; Kiely, G. ; Cescatti, A. ; Law, B.E. ; Wohlfahrt, G. ; Gielen, G. ; Roupsard, O. ; Moors, E.J. - \ 2014
    Biogeosciences 11 (2014). - ISSN 1726-4170 - p. 2185 - 2200.
    net ecosystem exchange - carbon-dioxide exchange - use efficiency model - forests green-up - rain-fed maize - interannual variability - vegetation index - surface temperature - climatic controls - deciduous forest
    Gross primary productivity (GPP) is the largest and most variable component of the global terrestrial carbon cycle. Repeatable and accurate monitoring of terrestrial GPP is therefore critical for quantifying dynamics in regional-to-global carbon budgets. Remote sensing provides high frequency observations of terrestrial ecosystems and is widely used to monitor and model spatiotemporal variability in ecosystem properties and processes that affect terrestrial GPP. We used data from the Moderate Resolution Imaging Spectroradiometer (MODIS) and FLUXNET to assess how well four metrics derived from remotely sensed vegetation indices (hereafter referred to as proxies) and six remote sensing-based models capture spatial and temporal variations in annual GPP. Specifically, we used the FLUXNET La Thuile data set, which includes several times more sites (144) and site years (422) than previous studies have used. Our results show that remotely sensed proxies and modeled GPP are able to capture significant spatial variation in mean annual GPP in every biome except croplands, but that the percentage of explained variance differed substantially across biomes (10–80%). The ability of remotely sensed proxies and models to explain interannual variability in GPP was even more limited. Remotely sensed proxies explained 40–60% of interannual variance in annual GPP in moisture-limited biomes, including grasslands and shrublands. However, none of the models or remotely sensed proxies explained statistically significant amounts of interannual variation in GPP in croplands, evergreen needleleaf forests, or deciduous broadleaf forests. Robust and repeatable characterization of spatiotemporal variability in carbon budgets is critically important and the carbon cycle science community is increasingly relying on remotely sensing data. Our analyses highlight the power of remote sensing-based models, but also provide bounds on the uncertainties associated with these models. Uncertainty in flux tower GPP, and difference between the footprints of MODIS pixels and flux tower measurements are acknowledged as unresolved challenges.
    Biophysical effects of forest management on surface temperature
    Jammet, M. ; Gielen, B. ; Moors, E.J. ; Rambal, S. ; Loustau, D. - \ 2012
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