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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    Understanding possible causes of exceeding dioxin levels in palm oil by-products: An explorative study
    Taverne-Veldhuizen, Wilma ; Hoogenboom, Ron ; Dam, Guillaume ten; Herbes, Rik ; Luning, Pieternel - \ 2020
    Food Control 108 (2020). - ISSN 0956-7135
    Hydrogenated - Non-regulated dioxins - Oil refining - Palm - Palm fatty acid distillate - Regulated dioxins

    The Rapid Alert System for Food and Feed (period 1999–2014) reported exceeding levels of dioxins (polychlorinated dibenzo-p-dioxinsand dibenzofurans (PCDD/Fs)) in palm oil by-products, such as palm fatty acid distillate (PFAD) and hydrogenated palm fatty acid distillate (HPFAD), but not in crude and refined palm oil. The aim of the present study was to gain insight into the occurrence and congener profiles of dioxin contamination during industrial processing of crude palm oil into refined oil and its by-products PFAD and HPFAD via analysis of individual congener concentrations. In total, 1217 samples from an industrial process were collected at four different points, crude palm oil at delivery (N = 202), fresh bleaching earth before bleaching (N = 84), PFAD after deodorising palm oil (N = 553), and HPFAD after hydrogenation of PFAD (N = 378). Congener profiles were analysed by GC-HRMS, and toxic equivalent (TEQ) levels were calculated using toxic equivalence factors (TEF) of WHO2005 to assess non-compliance to legal limits. All dioxin levels in crude palm oil samples were far below the action limit. All dioxin levels in fresh bleaching earth were in compliance with the maximum level. For the by-product samples, such as PFAD, 0.6% exceeded the action level, but all were below the maximum level (ML). However, for 1.3% of the HPFAD samples, the TEQ level exceeded the ML. In-depth analysis of the congener profiles revealed that after the hydrogenation step, the concentration of the lower chlorinated congeners in the HPFAD samples was higher than in the PFAD samples. The hydrogen atoms possibly replaced the chlorine atoms during hydrogenation. As these lower chlorinated congeners have a higher TEF, when they are regulated, their contribution to the calculated TEQ is higher, which resulted in some HPFAD samples exceeding the legal limit. Further research is needed to obtain insight into the changes in PCDD/F congener profiles during the hydrogenation of palm oil products.

    The Missing Middle: Connected action on agriculture and nutrition across global, national and local levels to achieve Sustainable Development Goal 2
    Veldhuizen, L.J.L. ; Giller, K.E. ; Oosterveer, P.J.M. ; Brouwer, I.D. ; Janssen, S.J.C. ; Zanten, H.H.E. van; Slingerland, M.A. - \ 2020
    Global Food Security 24 (2020). - ISSN 2211-9124 - 6 p.
    SDG2 - Food systems - Sustainable agriculture - Food security - Pathways - Stakeholders
    Sustainable development goal 2 (SDG 2) challenges the world to connect food production and consumption in a way that matches local contexts and enables everyone to enjoy a healthy diet that is produced sustainably and contributes to the other SDGs. We identify a Missing Middle between food production and consumption, and between globally defined goals and local implementation practices that may hinder progress towards SDG 2. Examples of this Missing Middle and how it can be bridged demonstrate that key challenges should be addressed in a more integrated manner for more effective action on SDG 2. We encourage actors in food provisioning to start addressing the Missing Middle by collaborating with relevant stakeholders in specified cases.
    Online crop growth modelling in MODFLOW Using SWAP-WOFOST
    Veldhuizen, A.A. ; Walsum, P.E.V. van - \ 2019
    - 1 p.
    Relevance of MODFLOW6 for Wageningen models
    Veldhuizen, Ab - \ 2019
    Technical feasibility of the coupling between MODFLOW6 and metaSWAP
    Walsum, P.E.V. van; Veldhuizen, Ab - \ 2019
    Modellering van het Bodem-Water-Atmosfeer-Plant systeem
    Veldhuizen, Ab - \ 2019
    Visie op de onverzadigde zone modellering
    Veldhuizen, Ab - \ 2019
    Nederlanders gooien steeds minder eten weg – Klopt dit wel?
    Herpen, Erica van - \ 2019
    E-conferences om kennis te vertalen naar de praktijk
    Veldhuizen, L.J.L. - \ 2019
    Presentatie in sessie: - Routekaart voor een SDG-proof voedselsysteem in Nederland
    Vast, misschien
    Kersten, A.H. - \ 2019

    Ook online verschenen als: Vastendieet kan kanker voorkomen - Klopt dit wel?

    Zuivere lucht
    Middelaar, C.E. van - \ 2019

    Ook online verschenen als: Gras van melkveehouderijen ‘zuivert de lucht’ en ‘slaat 20 duizend kilo CO2 op’ – Klopt dit wel?

    SDSN e-conference June 2019
    Veldhuizen, Linda - \ 2019
    An explorative study on a university’s outreach in the field of UN Sustainable Development Goal 2
    Jetten, Theo H. ; Veldhuizen, Linda J.L. ; Siebert, Mark ; Ommen Kloeke, A.E.E. van; Darroch, Peter I. - \ 2019
    Wageningen : Wageningen University & Research - 22
    This research explores whether and how the societal impact of research can be demonstrated by using proxy measures such as mentions of research in mainstream news media, social media and in policy documents. We explore the use of these measures within the research domain related to SDG 2 as a way to: compare performance against peer institutes and researchers; explore correlations between news media mentions, social media mentions and other more traditional ‘academic’ impact indicators such as citation counts; and explore whether relative scientific quality or news media / social media attention increases the likelihood of being used in policy documents through a case study that focuses on a key policy document produced by the Food and Agriculture Organisation (FAO) of the United Nations.Our results show that no clear relationship can be distinguished between scholarly output or various proxies of scientific quality with news media mentions. This result demonstrates that scientific quality does not necessarily translate into news media or social media mentions. Hence, universities and researchers need to actively invest in outreach to improve the contribution of research, researchers and research institutes to society. In addition, departments dealing with scientific benchmarking need to collaborate more closely with communication departments as universities may reconsider the way they organize their outreach to society.Articles cited by the policy document had higher values for citation metrics and had more Mendeley readers, tweets, Facebook mentions, blog mentions and news mentions than articles in the reference set that this policy document would have sourced from. The higher number of social media and news media mentions for the FAO references could have contributed to their uptake by the FAO policy document. However, this higher number could also be a result of the higher scientific quality of the FAO references. Researchers and research institutes are advised to consider joining the writing committee of relevant policy documents for more influence on policy making. There is a benefit to both software developers and policymakers to improve the visibility of policy documents for analysis as the coverage of policy documents is still limited. New insights based on a comprehensive analysis of more policy documents could trigger institutes to actively re-think the way they interact with policy and policymakers.
    Effecten van onderwaterdrainage op de regionale watervraag : berekeningen met het Landelijk Hydrologisch Model
    Rozemeijer, Joachim ; Boomsma, Huite ; Veldhuizen, Ab ; Pouwels, Janneke ; Akker, Jan van den; Kroon, Timo - \ 2019
    Delft : Deltares - 66
    In het veenweidegebied is het verminderen van maaivelddaling een belangrijk thema.Onderwaterdrainage wordt gezien als een mogelijkheid om de laagste grondwaterstanden te verhogen en is daarmee eenvan de mogelijkheden om maaivelddaling te verminderen. Het doel van dit onderzoek was de verandering in de watervraag in droge perioden door onderwaterdrainage voor een deel van West-Nederlandin beeld te brengen. Er is gebruik gemaakt vanhet Landelijk Hydrologisch Model (LHM-versie3.4.0) voor het doorrekenen van scenario’s (1) met en zonder onderwaterdrainage, (2) met huidig en toekomstig klimaat (GL en WH) en (3) meten zonder dynamisch peilbeheer.Dein het modelgebruikte drainage-en infiltratiedoorlatendheden zijn ingeschat op basis van meetresultaten uit lokalepilots. Om de effecten van onderwaterdrainage duidelijk te maken focussen we op de verandering in de watervraag voor peilhandhaving in peilvakken die voor minimaal 10% geschikt zijn voor onderwaterdrainage. De resultaten laten zien dat dezewatervraag in een droge periode toeneemt met ongeveer 0.09 mm/dag. De totale watervraag voor peilhandhaving voor deze gebieden is 1.16 mm/dag in dereferentiesituatie, waarmee de relatieve toename uitkomt op ca. 8%. De watervraag voor het gehele beheergebied van de West-Nederlandse waterschappen is 0.66 mm/dag. De extra watervraag voor peilhandhaving door onderwaterdrainage voor het gehele gebied is dan ook ongeveer 0.03 mm/dag (ca. 4%). Bij deze berekening is uitgegaan van een gemiddeld effect van 5-10 cm verhoging van de laagste grondwaterstanden die voorkomt uitpraktijkpilots. Als de infiltratie-effectiviteit van onderwaterdrainage vergroot wordt,bijvoorbeeld door verbeterde aanleg of door pompgestuurde onderwaterdrainage (drukdrains),dan zalhet effect op de laagste grondwaterstanden ende watervraag toenemen. Bij een gemiddelde verhoging van de laagste grondwaterstanden van30-40 cmverwachten we een extra watervraag van ongeveer 0.4 mm/dag (ca. 36%). Voor de gehele West-Nederlandse waterschappen komt dit neer op een extra watervraag van ongeveer 0.11 mm/dag (ca. 18%).De resultaten uit het model moeten gezien worden als een indicatieve kwantificering van de effecten van onderwaterdrainage. Er is behoefte aan meer meetinformatie over de effecten van onderwaterdrainage over langere perioden en in droge jaren en over de effecten op waterfluxen en waterkwaliteit. Deze meetinformatie kan gebruikt worden om ook de effecten op groter schaalniveau beter te kwantificeren.
    Exploration of the importance of physical properties of Indonesian peatlands to assess critical groundwater table depths, associated drought and fire hazard
    Taufik, M. ; Veldhuizen, A.A. ; Wösten, J.H.M. ; Lanen, H.A.J. van - \ 2019
    Geoderma 347 (2019). - ISSN 0016-7061 - p. 160 - 169.
    Local people livelihood - Peatland hydrology - Revegetation - Revitalisation - Rewetting - Soil-water-atmosphere-plant modelling - Water retention

    Widespread degradation of Indonesian peatlands by deforestation and excessive drainage results into more frequent fires, particularly in El Niño years, which causes: (i) release of enormous amounts of peat soil carbon to the atmosphere, impacting climate, (ii) severe air pollution, affecting human health and air traffic, and (iii) decreased ecosystem services through loss of biodiversity. Groundwater table decline is the main driver of these negative processes and, therefore restoration of peatland hydrology is essential. Although groundwater table depth is critical to counteract peatland degradation, optimal depths are not generic for all peatlands, but depend on peat physical properties (i.e. water retention, unsaturated conductivity), which are related to the degree of peat humification (Fibric, Hemic, Sapric). Unfortunately only few of these peat physical properties are available while they are essential input data in hydrological models required to extend the usually short observed groundwater hydrographs. An experiment with the Soil-Water-Atmosphere-Plant model (SWAP) for two locations in Indonesian peatlands illustrates the impact of the degree of peat humification on physical properties and thereby on calculated groundwater table depth, hydrological drought and associated fires hazards. The Variable Threshold Method is applied to convert groundwater table depths into hydrological drought, and next the modified Keetch-Byram Drought Index (mKBDI) is used to assess wildfire hazard. Peat physical properties that reflect higher peat humification (Hemic and Sapric) result into lower water tables during dry periods, in particular during El Niño years, more severe hydrological drought, and an earlier and longer fire season. Using the limited available peat physical properties the importance is demonstrated of initiating a comprehensive programme to build a database of peat physical properties covering different environmental conditions in which tropical peatlands occur. Availability of such a database connected to a long-term monitoring programme, will support the ongoing rewetting, revegetation and revitalisation programme for Indonesian peatlands, which eventually will contribute to sustainable livelihoods for local people and reduce impact on the regional climate.

    The contribution of biorefineries to rural development: the case of employment in Hungary
    Heijman, W.J.M. ; Szabo, Zoltan ; Veldhuizen, Esther - \ 2019
    Studies in Agricultural Economics 121 (2019). - ISSN 1418-2106 - 12 p.
    biofuels - biofuel policies - ethanol - rural development - input-output analysis - employment
    Most recent research concerning biofuels focuses on their potential for mitigating climate change, while their rural development dimension is given less prominence. Ongoing policy debates, including EU and US biofuel policies, pay little attention to this feature of the industry. This paper explores the impact of biorefineries on rural development, and employment in particular. It shows that biorefineries can have a considerable economic impact on the regions in which they are located. Embedded in the local social and economic fabric, the paper demonstrates their influence on regional and national labour markets. The case of a bioethanol plant in Hungary and its effect on the rural labour market in two counties of the country is studied by way of an input-output model. The research has found that the operation of a biorefinery stimulates the creation and maintenance of jobs in both farming and service industries. Results suggest that biorefineries are an important driver of rural development and that this aspect of the industry should be given greater weight in formulating biofuel policies.
    WUR and UN SDSN: How can we work together on the SDGs?
    Veldhuizen, L.J.L. - \ 2019
    Good practice in food-related neuroimaging
    Smeets, Paul A.M. ; Dagher, Alain ; Hare, Todd A. ; Kullmann, Stephanie ; Laan, Laura N. van der; Poldrack, Russell A. ; Preissl, Hubert ; Small, Dana ; Stice, Eric ; Veldhuizen, Maria G. - \ 2019
    American Journal of Clinical Nutrition 109 (2019)3. - ISSN 0002-9165 - p. 491 - 503.
    aroma - data sharing - food choice - food viewing - functional magnetic resonance imaging - good practice - neuroimaging - satiation - taste

    The use of neuroimaging tools, especially functional magnetic resonance imaging, in nutritional research has increased substantially over the past 2 decades. Neuroimaging is a research tool with great potential impact on the field of nutrition, but to achieve that potential, appropriate use of techniques and interpretation of neuroimaging results is necessary. In this article, we present guidelines for good methodological practice in functional magnetic resonance imaging studies and flag specific limitations in the hope of helping researchers to make the most of neuroimaging tools and avoid potential pitfalls. We highlight specific considerations for food-related studies, such as how to adjust statistically for common confounders, like, for example, hunger state, menstrual phase, and BMI, as well as how to optimally match different types of food stimuli. Finally, we summarize current research needs and future directions, such as the use of prospective designs and more realistic paradigms for studying eating behavior.

    Agrohydrological analysis of groundwater recharge and land use changes in the Pampas of Argentina
    Kroes, Joop ; Dam, Jos van; Supit, Iwan ; Abelleyra, Diego de; Verón, Santiago ; Wit, Allard de; Boogaard, Hendrik ; Angelini, Marcos ; Damiano, Francisco ; Groenendijk, Piet ; Wesseling, Jan ; Veldhuizen, Ab - \ 2019
    Agricultural Water Management 213 (2019). - ISSN 0378-3774 - p. 843 - 857.
    Argentina - Capillary rise - Groundwater recharge - Land use - Pampas - Soybean - SWAP - WOFOST

    This paper studies the changes of groundwater, climate and land use in the Pampas of Argentina. These changes offer opportunities and threats. Lowering groundwater without irrigation causes drought and successive crop and yield damage. Rising groundwater may alleviate drought as capillary rise supports root water uptake and crop growth, thus narrowing the difference between potential and actual yields. However, rising groundwater may also limit soil water storage, cause flooding in metropolitan areas and have a negative impact on crop yields. Changing land use from continuous soy bean into crop rotations or natural vegetation may decrease groundwater recharge and thus decrease groundwater levels. In case of crop rotation however, leaching of nutrients like nitrate may increase. We quantified these impacts using integrated dynamic crop growth and soil hydrology modelling. The models were tested at field scale using a local dataset from Argentina. We applied distributed modelling at regional scale to evaluate the impacts on groundwater recharge and crop yields using long term weather data. The experiments showed that threats arise from continuous monotone land use. Opportunities are created when a proper balance is found between supply and demand of soil water using a larger differentiation of land use. Increasing the areas of land use types with higher evapotranspiration, like permanent grassland and trees, will contribute to a more stable hydrologic system with more water storage capacities in the soil system and lower groundwater levels. Modelling tools clearly support the evaluation of the impact of land use and climate change on groundwater levels and crop yields.

    The Missing Middle in SDG 2: The dual disconnect between global goals and local contexts, and between food production and consumption
    Veldhuizen, L.J.L. ; Giller, K.E. ; Boer, I.J.M. de; Oosterveer, P.J.M. ; Brouwer, I.D. ; Janssen, S.J.C. ; Zanten, H.H.E. van; Slingerland, M.A. - \ 2018
    Session S6
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