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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Landschapsarchitectuur : tussen ontwerp & onderzoek
Nijhuis, Steffen ; Niederer, Danielle ; Bekker, Joeri de; Berkers, Marieke ; Dooren, Noël van; Eker, Mark ; Horlings, Harma ; Janssen, Joks ; Kersten, Inge ; Tilborg, Hank van; Lenzholzer, Sandra ; Maaskant, Madeleine ; Meijer, Jan Herman ; Noordhuizen, Jorrit ; Nijkrake, Wieteke ; Noortman, Adrian ; Vries, Jeroen de; Vlug, Johan ; Stolk, Egbert ; Veenstra, Abe - \ 2017
Wageningen : Dutch School of Landscape Architecture (Dutch School of Landscape Architecture perspectieven vol. 1) - 120
Large meta-analysis of genome-wide association studies identifies five loci for lean body mass
Zillikens, M.C. ; Demissie, Serkalem ; Hsu, Yi Hsiang ; Yerges-Armstrong, Laura M. ; Chou, Wen Chi ; Stolk, Lisette ; Livshits, Gregory ; Broer, Linda ; Johnson, Toby ; Koller, Daniel L. ; Kutalik, Zoltán ; Luan, J.A. ; Malkin, Ida ; Ried, Janina S. ; Smith, Albert V. ; Thorleifsson, Gudmar ; Vandenput, Liesbeth ; Hua Zhao, Jing ; Zhang, Weihua ; Aghdassi, Ali ; Åkesson, Kristina ; Amin, Najaf ; Baier, Leslie J. ; Barroso, Inês ; Bennett, David A. ; Bertram, Lars ; Biffar, Rainer ; Bochud, Murielle ; Boehnke, Michael ; Borecki, Ingrid B. ; Buchman, Aron S. ; Byberg, Liisa ; Campbell, Harry ; Campos Obanda, Natalia ; Cauley, Jane A. ; Cawthon, Peggy M. ; Cederberg, Henna ; Chen, Zhao ; Cho, Nam H. ; Jin Choi, Hyung ; Claussnitzer, Melina ; Collins, Francis ; Cummings, Steven R. ; Jager, Philip L. De; Demuth, Ilja ; Dhonukshe-Rutten, Rosalie A.M. ; DIatchenko, Luda ; Eiriksdottir, Gudny ; Enneman, Anke W. ; Erdos, Mike ; Eriksson, Johan G. ; Eriksson, Joel ; Estrada, Karol ; Evans, Daniel S. ; Feitosa, Mary F. ; Fu, Mao ; Garcia, Melissa ; Gieger, Christian ; Girke, Thomas ; Glazer, Nicole L. ; Grallert, Harald ; Grewal, Jagvir ; Han, Bok Ghee ; Hanson, Robert L. ; Hayward, Caroline ; Hofman, Albert ; Hoffman, Eric P. ; Homuth, Georg ; Hsueh, Wen Chi ; Hubal, Monica J. ; Hubbard, Alan ; Huffman, Kim M. ; Husted, Lise B. ; Illig, Thomas ; Ingelsson, Erik ; Ittermann, Till ; Jansson, John Olov ; Jordan, Joanne M. ; Jula, Antti ; Karlsson, Magnus ; Khaw, Kay Tee ; Kilpelaïnen, Tuomas O. ; Klopp, Norman ; Kloth, Jacqueline S.L. ; Koistinen, Heikki A. ; Kraus, William E. ; Kritchevsky, Stephen ; Kuulasmaa, Teemu ; Kuusisto, Johanna ; Laakso, Markku ; Lahti, Jari ; Lang, Thomas ; Langdahl, Bente L. ; Launer, Lenore J. ; Lee, Jong Young ; Lerch, Markus M. ; Lewis, Joshua R. ; Lind, Lars ; Lindgren, Cecilia M. ; Liu, Yongmei ; Liu, Tian ; Liu, Youfang ; Ljunggren, Östen ; Lorentzon, Mattias ; Luben, Robert N. ; Maixner, William ; McGuigan, Fiona E. ; Medina-Gomez, Carolina ; Meitinger, Thomas ; Melhus, Håkan ; Mellström, Dan ; Melov, Simon ; Michaëlsson, Karl ; Mitchell, Braxton D. ; Morris, Andrew P. ; Mosekilde, Leif ; Newman, Anne ; Nielson, Carrie M. ; O'Connell, Jeffrey R. ; Oostra, Ben A. ; Orwoll, Eric S. ; Palotie, Aarno ; Parker, Stephan ; Peacock, Munro ; Perola, Markus ; Peters, Annette ; Polasek, Ozren ; Prince, Richard L. ; Raïkkönen, Katri ; Ralston, Stuart H. ; Ripatti, Samuli ; Robbins, John A. ; Rotter, Jerome I. ; Rudan, Igor ; Salomaa, Veikko ; Satterfield, Suzanne ; Schadt, Eric E. ; Schipf, Sabine ; Scott, Laura ; Sehmi, Joban ; Shen, Jian ; Soo Shin, Chan ; Sigurdsson, Gunnar ; Smith, Shad ; Soranzo, Nicole ; Stančáková, Alena ; Steinhagen-Thiessen, Elisabeth ; Streeten, Elizabeth A. ; Styrkarsdottir, Unnur ; Swart, Karin M.A. ; Tan, Sian Tsung ; Tarnopolsky, Mark A. ; Thompson, Patricia ; Thomson, Cynthia A. ; Thorsteinsdottir, Unnur ; Tikkanen, Emmi ; Tranah, Gregory J. ; Tuomilehto, Jaakko ; Schoor, Natasja M. van; Verma, Arjun ; Vollenweider, Peter ; Völzke, Henry ; Wactawski-Wende, Jean ; Walker, Mark ; Weedon, Michael N. ; Welch, Ryan ; Wichman, H.E. ; Widen, Elisabeth ; Williams, Frances M.K. ; Wilson, James F. ; Wright, Nicole C. ; Xie, Weijia ; Yu, Lei ; Zhou, Yanhua ; Chambers, John C. ; Döring, Angela ; Duijn, Cornelia M. Van; Econs, Michael J. ; Gudnason, Vilmundur ; Kooner, Jaspal S. ; Psaty, Bruce M. ; Spector, Timothy D. ; Stefansson, Kari ; Rivadeneira, Fernando ; Uitterlinden, André G. ; Wareham, Nicholas J. ; Ossowski, Vicky ; Waterworth, Dawn M. ; Loos, Ruth J.F. ; Karasik, David ; Harris, Tamara B. ; Ohlsson, Claes ; Kiel, Douglas P. - \ 2017
Nature Communications 8 (2017)1. - ISSN 2041-1723
Lean body mass, consisting mostly of skeletal muscle, is important for healthy aging. We performed a genome-wide association study for whole body (20 cohorts of European ancestry with n = 38,292) and appendicular (arms and legs) lean body mass (n = 28,330) measured using dual energy X-ray absorptiometry or bioelectrical impedance analysis, adjusted for sex, age, height, and fat mass. Twenty-one single-nucleotide polymorphisms were significantly associated with lean body mass either genome wide (p < 5 × 10-8) or suggestively genome wide (p < 2.3 × 10-6). Replication in 63,475 (47,227 of European ancestry) individuals from 33 cohorts for whole body lean body mass and in 45,090 (42,360 of European ancestry) subjects from 25 cohorts for appendicular lean body mass was successful for five single-nucleotide polymorphisms in/near HSD17B11, VCAN, ADAMTSL3, IRS1, and FTO for total lean body mass and for three single-nucleotide polymorphisms in/near VCAN, ADAMTSL3, and IRS1 for appendicular lean body mass. Our findings provide new insight into the genetics of lean body mass.
Genome-wide analysis identifies 12 loci influencing human reproductive behavior
Barban, Nicola ; Jansen, Rick ; Vlaming, Ronald de; Vaez, Ahmad ; Mandemakers, Jornt J. ; Tropf, Felix C. ; Shen, Xia ; Wilson, James F. ; Chasman, Daniel I. ; Nolte, Ilja M. ; Tragante, Vinicius ; Laan, Sander W. van der; Perry, John R.B. ; Kong, Augustine ; Ahluwalia, Tarunveer S. ; Albrecht, Eva ; Yerges-Armstrong, Laura ; Atzmon, Gil ; Auro, Kirsi ; Ayers, Kristin ; Bakshi, Andrew ; Ben-Avraham, Danny ; Berger, Klaus ; Bergman, Aviv ; Bertram, Lars ; Bielak, Lawrence F. ; Bjornsdottir, Gyda ; Bonder, Marc Jan ; Broer, Linda ; Bui, Minh ; Barbieri, Caterina ; Cavadino, Alana ; Chavarro, Jorge E. ; Turman, Constance ; Concas, Maria Pina ; Cordell, Heather J. ; Davies, Gail ; Eibich, Peter ; Eriksson, Nicholas ; Esko, Tõnu ; Eriksson, Joel ; Falahi, Fahimeh ; Felix, Janine F. ; Fontana, Mark Alan ; Franke, Lude ; Gandin, Ilaria ; Gaskins, Audrey J. ; Gieger, Christian ; Gunderson, Erica P. ; Guo, Xiuqing ; Hayward, Caroline ; He, Chunyan ; Hofer, Edith ; Huang, Hongyan ; Joshi, Peter K. ; Kanoni, Stavroula ; Karlsson, Robert ; Kiechl, Stefan ; Kifley, Annette ; Kluttig, Alexander ; Kraft, Peter ; Lagou, Vasiliki ; Lecoeur, Cecile ; Lahti, Jari ; Li-Gao, Ruifang ; Lind, Penelope A. ; Liu, Tian ; Makalic, Enes ; Mamasoula, Crysovalanto ; Matteson, Lindsay ; Mbarek, Hamdi ; McArdle, Patrick F. ; McMahon, George ; Meddens, S.F.W. ; Mihailov, Evelin ; Miller, Mike ; Missmer, Stacey A. ; Monnereau, Claire ; Most, Peter J. van der; Myhre, Ronny ; Nalls, Mike A. ; Nutile, Teresa ; Kalafati, Ioanna Panagiota ; Porcu, Eleonora ; Prokopenko, Inga ; Rajan, Kumar B. ; Rich-Edwards, Janet ; Rietveld, Cornelius A. ; Robino, Antonietta ; Rose, Lynda M. ; Rueedi, Rico ; Ryan, Kathleen A. ; Saba, Yasaman ; Schmidt, Daniel ; Smith, Jennifer A. ; Stolk, Lisette ; Streeten, Elizabeth ; Tönjes, Anke ; Thorleifsson, Gudmar ; Ulivi, Sheila ; Wedenoja, Juho ; Wellmann, Juergen ; Willeit, Peter ; Yao, Jie ; Yengo, Loic ; Zhao, Jing Hua ; Zhao, Wei ; Zhernakova, Daria V. ; Amin, Najaf ; Andrews, Howard ; Balkau, Beverley ; Barzilai, Nir ; Bergmann, Sven ; Biino, Ginevra ; Bisgaard, Hans ; Bønnelykke, Klaus ; Boomsma, Dorret I. ; Buring, Julie E. ; Campbell, Harry ; Cappellani, Stefania ; Ciullo, Marina ; Cox, Simon R. ; Cucca, Francesco ; Toniolo, Daniela ; Davey-Smith, George ; Deary, Ian J. ; Dedoussis, George ; Deloukas, Panos ; Duijn, Cornelia M. van; Geus, Eco J.C. de; Eriksson, Johan G. ; Evans, Denis A. ; Faul, Jessica D. ; Sala, Cinzia Felicita ; Froguel, Philippe ; Gasparini, Paolo ; Girotto, Giorgia ; Grabe, Hans-Jörgen ; Greiser, Karin Halina ; Groenen, Patrick J.F. ; Haan, Hugoline G. de; Haerting, Johannes ; Harris, Tamara B. ; Heath, Andrew C. ; Heikkilä, Kauko ; Hofman, Albert ; Homuth, Georg ; Holliday, Elizabeth G. ; Hopper, John ; Hyppönen, Elina ; Jacobsson, Bo ; Jaddoe, Vincent W.V. ; Johannesson, Magnus ; Jugessur, Astanand ; Kähönen, Mika ; Kajantie, Eero ; Kardia, Sharon L.R. ; Keavney, Bernard ; Kolcic, Ivana ; Koponen, Päivikki ; Kovacs, Peter ; Kronenberg, Florian ; Kutalik, Zoltan ; Bianca, Martina la; Lachance, Genevieve ; Iacono, William G. ; Lai, Sandra ; Lehtimäki, Terho ; Liewald, David C. ; Lindgren, Cecilia M. ; Liu, Yongmei ; Luben, Robert ; Lucht, Michael ; Luoto, Riitta ; Magnus, Per ; Magnusson, Patrik K.E. ; Martin, Nicholas G. ; McGue, Matt ; McQuillan, Ruth ; Medland, Sarah E. ; Meisinger, Christa ; Mellström, Dan ; Metspalu, Andres ; Traglia, Michela ; Milani, Lili ; Mitchell, Paul ; Montgomery, Grant W. ; Mook-Kanamori, Dennis ; Mutsert, Renée de; Nohr, Ellen A. ; Ohlsson, Claes ; Olsen, Jørn ; Ong, Ken K. ; Paternoster, Lavinia ; Pattie, Alison ; Penninx, Brenda W.J.H. ; Perola, Markus ; Peyser, Patricia A. ; Pirastu, Mario ; Polasek, Ozren ; Power, Chris ; Kaprio, Jaakko ; Raffel, Leslie J. ; Räikkönen, Katri ; Raitakari, Olli ; Ridker, Paul M. ; Ring, Susan M. ; Roll, Kathryn ; Rudan, Igor ; Ruggiero, Daniela ; Rujescu, Dan ; Salomaa, Veikko ; Schlessinger, David ; Schmidt, Helena ; Schmidt, Reinhold ; Schupf, Nicole ; Smit, Johannes ; Sorice, Rossella ; Spector, Tim D. ; Starr, John M. ; Stöckl, Doris ; Strauch, Konstantin ; Stumvoll, Michael ; Swertz, Morris A. ; Thorsteinsdottir, Unnur ; Thurik, A.R. ; Timpson, Nicholas J. ; Tung, Joyce Y. ; Uitterlinden, André G. ; Vaccargiu, Simona ; Viikari, Jorma ; Vitart, Veronique ; Völzke, Henry ; Vollenweider, Peter ; Vuckovic, Dragana ; Waage, Johannes ; Wagner, Gert G. ; Wang, Jie Jin ; Wareham, Nicholas J. ; Weir, David R. ; Willemsen, Gonneke ; Willeit, Johann ; Wright, Alan F. ; Zondervan, Krina T. ; Stefansson, Kari ; Krueger, Robert F. ; Lee, James J. ; Benjamin, Daniel J. ; Cesarini, David ; Koellinger, Philipp D. ; Hoed, Marcel den; Snieder, Harold ; Mills, Melinda C. - \ 2016
Nature Genetics 48 (2016)12. - ISSN 1061-4036 - p. 1462 - 1472.
The genetic architecture of human reproductive behavior—age at first birth (AFB) and number of children ever born (NEB)—has a strong relationship with fitness, human development, infertility and risk of neuropsychiatric disorders. However, very few genetic loci have been identified, and the underlying mechanisms of AFB and NEB are poorly understood. We report a large genome-wide association study of both sexes including 251,151 individuals for AFB and 343,072 individuals for NEB. We identified 12 independent loci that are significantly associated with AFB and/or NEB in a SNP-based genome-wide association study and 4 additional loci associated in a gene-based effort. These loci harbor genes that are likely to have a role, either directly or by affecting non-local gene expression, in human reproduction and infertility, thereby increasing understanding of these complex traits.
Temperatuurnormering koelwaterlozing en botulisme, Inventarisatie, stand van kennis en hoe nu verder in het Hollandsch Diep en andere rijkswateren
Haye, M.A.A. de la; Leewis, L. ; Verduin, E. ; Stolk, R. ; Koene, M.G.J. ; Kardinaal, E. - \ 2015
Amsterdam : CVI Wageningen UR (Grondmij Rapport GM-0156192)
Representativeness of the LifeLines Cohort Study
Klijs, B. ; Scholtens, S. ; Mandemakers, J.J. ; Snieder, H. ; Stolk, R.P. ; Smidt, N. - \ 2015
PLoS One 10 (2015)9. - ISSN 1932-6203 - 12 p.
Background LifeLines is a large prospective population-based three generation cohort study in the north of the Netherlands. Different recruitment strategies were adopted: recruitment of an index population via general practitioners, subsequent inclusion of their family members, and online self-registration. Our aim was to investigate the representativeness of the adult study population at baseline and to evaluate differences in the study population according to recruitment strategy. Methods Demographic characteristics of the LifeLines study population, recruited between 2006–2013, were compared with the total adult population in the north of the Netherlands as registered in the Dutch population register. Socioeconomic characteristics, lifestyle, chronic diseases, and general health were further compared with participants of the Permanent Survey of Living Conditions within the region (2005–2011, N = 6,093). Differences according to recruitment strategy were assessed. Results Compared with the population of the north of the Netherlands, LifeLines participants were more often female, middle aged, married, living in a semi-urban place and Dutch native. Adjusted for differences in demographic composition, in LifeLines a smaller proportion had a low educational attainment (5% versus 14%) or had ever smoked (54% versus 66%). Differences in the prevalence of various chronic diseases and low general health scores were mostly smaller than 3%. The age profiles of the three recruitment groups differed due to age related inclusion criteria of the recruitment groups. Other differences according to recruitment strategy were small. Conclusions Our results suggest that, adjusted for differences in demographic composition, the LifeLines adult study population is broadly representative for the adult population of the north of the Netherlands. The recruitment strategy had a minor effect on the level of representativeness. These findings indicate that the risk of selection bias is low and that risk estimates in LifeLines can be generalized to the general population.
Cohort profile: Lifelines DEEP, a prospective, general population cohort study in the northern Netherlands: study design and baseline characteristics
Tigchelaar, E.F. ; Zhernakova, A. ; Dekens, J.A.M. ; Hermes, G.D.A. ; Baranska, A. ; Mujagic, Z. ; Swertz, M.A. ; Munoz, A.M. ; Deelen, P. ; Cenit, M.C. ; Franke, L. ; Scholtens, S. ; Stolk, R.P. ; Wijmenga, C. ; Feskens, E.J.M. - \ 2015
BMJ Open 5 (2015). - ISSN 2044-6055 - 9 p.
Purpose There is a critical need for population-based prospective cohort studies because they follow individuals before the onset of disease, allowing for studies that can identify biomarkers and disease-modifying effects, and thereby contributing to systems epidemiology. Participants This paper describes the design and baseline characteristics of an intensively examined subpopulation of the LifeLines cohort in the Netherlands. In this unique subcohort, LifeLines DEEP, we included 1539 participants aged 18 years and older. Findings to date We collected additional blood (n=1387), exhaled air (n=1425) and faecal samples (n=1248), and elicited responses to gastrointestinal health questionnaires (n=1176) for analysis of the genome, epigenome, transcriptome, microbiome, metabolome and other biological levels. Here, we provide an overview of the different data layers in LifeLines DEEP and present baseline characteristics of the study population including food intake and quality of life. We also describe how the LifeLines DEEP cohort allows for the detailed investigation of genetic, genomic and metabolic variation for a wide range of phenotypic outcomes. Finally, we examine the determinants of gastrointestinal health, an area of particular interest to us that can be addressed by LifeLines DEEP. Future plans We have established a cohort of which multiple data levels allow for the integrative analysis of populations for translation of this information into biomarkers for disease, and which will offer new insights into disease mechanisms and prevention.
The effects of long-term daily folic acid and vitamin B12 supplementation on genome-wide DNA methylation in elderly subjects
Kok, D.E.G. ; Dhonukshe-Rutten, R.A.M. ; Lute, C. ; Heil, S. ; Uitterlinden, A.G. ; Velde, N. van der; Meurs, J.B.J. van; Stolk, L. ; Schoor, N.M. van; Groot, C.P.G.M. de; Kampman, E. ; Steegenga, W.T. - \ 2015
Effects of long-term daily folic acid and vitamin B12 supplementation on genome-wide DNA methylation in elderly subjects
Kok, D.E.G. ; Dhonukshe-Rutten, R.A.M. ; Lute, C. ; Heil, S.G. ; Uitterlinden, A.G. ; Velde, N. van der; Meurs, J.B.J. van; Stolk, L. ; Schoor, N.M. van; Groot, C.P.G.M. de; Kampman, E. ; Steegenga, W.T. - \ 2014
The effects of folic acid and vitamin B12 on global and genome-wide DNA methylation in elderly subjects
Kok, D.E.G. ; Dhonukshe-Rutten, R.A.M. ; Lute, C. ; Heil, S.G. ; Uitterlinden, A.G. ; Velde, N. van der; Meurs, J.B.J. van; Stolk, L. ; Groot, C.P.G.M. de; Kampman, E. ; Steegenga, W.T. - \ 2014
A sense of change: media designers and artists communicating about complexity in social-ecological systems
Vervoort, J.M. ; Keuskamp, D. ; Kok, K. ; Lammeren, R.J.A. van; Stolk, T. ; Veldkamp, T. ; Rekveld, J. ; Schelfhout, R. ; Teklenburg, B. ; Cavalheiro Borges, A. ; Jánoškóva, S. ; Wits, W. ; Assmann, N. ; Abdi Dezfouli, E. ; Cunningham, K. ; Nordeman, B. ; Rowlands, H. - \ 2014
Ecology and Society 19 (2014)3. - ISSN 1708-3087 - 19 p.
virtual-reality - visualization - perspective - simulation - thinking - science
To take on the current and future challenges of global environmental change, fostering a widespread societal understanding of and engagement with the complex dynamics that characterize interacting human and natural systems is essential. Current science communication methods struggle with a number of specific challenges associated with communicating about complex systems. In this study we report on two collaborative processes, a short workshop and longer course, that aimed to harness the insights of interactive media designers and artists to overcome these challenges. The two processes resulted in 86 new interactive media concepts which were selected by the participants and organizers using set criteria and then evaluated using the same criteria by a panel of communication and media design experts and a panel of complex systems scientists using the same criteria. The top eight concepts are discussed in this paper. These concepts fell into the categories of serious games, group interaction concepts, and social media storytelling. The serious games focused directly on complex systems characteristics and were evaluated to be intuitive and engaging designs that combined transparency and complexity well. The group interaction concepts focused mostly on feedbacks and nonlinearity but were fully developed and tested in the workshops, and evaluated as engaging, accessible, and easy to implement in workshops and educational settings. The social media storytelling concepts involved less direct interactions with system dynamics but were seen as highly accessible to large scale audiences. The results of this study show the potential of interdisciplinary collaboration between complex systems scientists, designers, and artists. The results and process discussed in this paper show the value of more structural engagement of interactive media designers and artist communities in the development of communication tools about human and natural systems change.
Simulating emission of ammonia after liquid manure applicaton on arable land : Preliminary performance assessment of the Volt'air model for manure application conditions in the Netherlands
Huijsmans, J.F.M. ; Holterman, H.J. ; Vermeulen, G.D. ; Stolk, A.J. ; Pul, W.A.J. van - \ 2014
Wageningen : Wageningen UR - 42
akkerbouw - rundveemest - ammoniakemissie - nederland - arable farming - cattle manure - ammonia emission - netherlands
The high variability of the total ammonia emission after manure application on agricultural land in the Netherlands can be partly be linked to the application method, slurry characteristics and the meteorological conditions by statistical analysis of the experimental results.
F:ACTS! : Forms for adapting to climate change through territorial strategies : the handbook
Garcia, A.M. ; Ónega, J. ; Crecente, R. ; Holst, F. van; Abts, E. ; Timmermans, W. ; Stolk, M. - \ 2014
[S.l.] : INTERREG IVC - ISBN 9788469554012 - 117
klimaatverandering - landgebruik - onderzoeksprojecten - regionale planning - landen van de europese unie - climatic change - land use - research projects - regional planning - european union countries
The F:ACTS! project contributed to generating knowledge on how to develop territorial strategies to adapt to climate change, facilitating the interchange of experience and information among its 14 partners across 8 countries. Integrated territorial strategies incorporate local diversity since they enable the adaptation of general and sector policies to territorial particularities. Climate Change Adaptation highly benefits from understanding the multiple, dynamic and complex relations between people and land. The ambition was to exchange knowledge and good practices among 14 partners in eight regions in Europe. Among them The Netherlands and Flanders (Belgium).
The effects of folic acid and vitamin B12 on global and genome-wide DNA methylation in elderly subjects
Kok, D.E.G. ; Dhonukshe-Rutten, R.A.M. ; Lute, C. ; Heil, S.G. ; Uitterlinden, A.G. ; Velde, N. van der; Meurs, J.B.J. van; Stolk, L. ; Schoor, N.M. van; Groot, C.P.G.M. de; Kampman, E. ; Steegenga, W.T. - \ 2014
Inter-annual variability of carbon exchange and extreme events at the Loobos pine forest
Elbers, J.A. ; Moors, E.J. ; Hutjes, R.W.A. ; Jacobs, C.M.J. ; Jans, W.W.P. ; Kruijt, B. ; Stolk, P.C. ; Maat, H.W. ter; Vermeulen, M.H. ; Abreu, P. - \ 2013
Water en nutriënten gelimiteerde gewasopbrengst : koppeling van de modellen SWAP-ANIMAO-WOFOST
Stolk, P.C. ; Kroes, J.G. - \ 2012
Wageningen : Alterra, Wageningen-UR (Alterra-rapport 2346) - 47
bodemwater - agrohydrologie - bodemchemie - biogeochemie - stikstof - modellen - gewasgroeimodellen - soil water - agrohydrology - soil chemistry - biogeochemistry - nitrogen - models - crop growth models
Dit rapport beschrijft een verkennende studie voor een methodiek waarin de bodem-nutriëntenhuishouding op dynamische wijze is gekoppeld aan gewasgroei. Voor deze studie is gewasgroei gesimuleerd met het model WOFOST, gekoppeld aan het hydrologisch model SWAP. Dit is uitgebreid met een dynamische koppeling met het biogeochemisch model ANIMO waardoor het mogelijk is terugkoppelingen tussen nutriënten, water en vegetatie te bestuderen. In een casestudie en verschillende modelexperimenten is nagegaan wat het effect is van een beperking in bodem-nutriëntenaanbod op gewasgroei en verdamping. De modelresultaten laten zien dat het veronderstelde effect van stikstoftekort op gewasgroei en verdamping aantoonbaar is en gekwantificeerd kan worden met het huidige modelinstrumentarium. Hierbij is het aanbod van water en nutriënten in detail gemodelleerd. De vraagkant vanuit het gewas is relatief eenvoudig gemodelleerd en vereist nadere studie om operationele toepassingen (bijvoorbeeld schade-berekeningen) mogelijk te maken.
Modelling the effect of aggregates on N2O emission from denitrification in an agricultural peat soil
Stolk, P.C. ; Hendriks, R.F.A. ; Jacobs, C.M.J. ; Moors, E.J. ; Kabat, P. - \ 2011
Biogeosciences 8 (2011)9. - ISSN 1726-4170 - p. 2649 - 2663.
nitrous-oxide emissions - covariance flux measurements - water-flow - structured soils - porous-media - new-zealand - simulation - grassland - field - dynamics
Nitrous oxide (N2O) emissions are highly variable in time, with high peak emissions lasting a few days to several weeks and low background emissions. This temporal variability is poorly understood which hampers the simulation of daily N2O emissions. In structured soils, like clay and peat, aggregates hamper the diffusion of oxygen, which leads to anaerobic microsites in the soil, favourable for denitrification. Diffusion of N2O out of the aggregates is also hampered, which leads to delayed emissions and increased reduction of N2O to N-2. In this model simulation study we investigate the effect of aggregates in soils on the N2O emissions. We present a parameterization to simulate the effects of aggregates on N2O production by denitrification and on N2O reduction. The parameterization is based on the mobile-immobile model concept. It was implemented in a field-scale hydrological-biogeochemical model combination. We compared the simulated fluxes with observed fluxes from a fertilized and drained peat soil under grass. The results of this study show that aggregates strongly affect the simulated N2O emissions: peak emissions are lower, whereas the background emissions are slightly higher. Including the effect of aggregates caused a 40% decrease in the simulated annual emissions relative to the simulations without accounting for the effects of aggregates. The new parameterization significantly improved the model performance regarding simulation of observed daily N2O fluxes; r(2) and RMSE improved from 0.11 and 198 g N2O-N ha(-1) d(-1) to 0.41 and 40 g N2O-N ha(-1) d(-1), respectively. Our analyses of the model results show that aggregates have a larger impact on the reduction than on the production of N2O. Reduction of N2O is more sensitive to changes in the drivers than production of N2O and is in that sense the key to understanding N2O emissions from denitrification. The effects of changing environmental conditions on reduction of N2O relative to N2O production strongly depend on the NO3 content of the soil. More anaerobic conditions have hardly any effect on the ratio of production to reduction if NO3 is abundant, but will decrease this ratio if NO3 is limiting. In the first case the emissions will increase, whereas in the second case the emissions will decrease. This study suggests that the current knowledge of the hydrological, biogeochemical and physical processes may be sufficient to understand the observed N2O fluxes from a fertilized clayey peatland. Further research is needed to test how aggregates affect the N2O fluxes from other soils or soils with different fertilization regimes.
The effect of changes in groundwater level on N2O emissions for various soil conditions
Stolk, P.C. ; Jacobs, C.M.J. ; Moors, E.J. - \ 2011
The effect of soil aggregates on peak emissions of N2O
Stolk, P.C. ; Hendriks, R.F.A. ; Jacobs, C.M.J. ; Moors, E.J. - \ 2011
In: European Geosciences Union General Assembly 2011, Vienna, Austria, 3 - 8 April 2011. - EGU General Assembly - p. 3594 - 3594.
The effect of aggregates on N2O emission from denitrification in an agricultural peat soil
Stolk, P.C. ; Hendriks, R.F.A. ; Jacobs, C.M.J. ; Moors, E.J. ; Kabat, P. - \ 2011
Biogeosciences Discussions 8 (2011)2. - ISSN 1810-6277 - p. 3253 - 3287.
Nitrous oxide (N2O) emissions are highly variable in time, with high peak emissions lasting as couple of days to weeks and low background emissions. This temporal variability is poorly understood which hampers the simulation of daily N2O emissions. In structured soils, like clay and peat, aggregates hamper the diffusion of oxygen, which leads to anaerobic microsites in the soil, favourable for denitrification. In this paper we studied the effect of aggregates in soils on the N2O emissions from denitrification. We presented a parameterization to simulate the effects of aggregates on N2O, following the mobile-immobile model concept. This parameterization was implemented in a field-scale hydrological-biogeochemical model combination. We compared the simulated fluxes with observed fluxes from a fertilized and drained peat soil with grass. The results of this study showed that aggregates strongly affect N2O emissions: peak emissions are lower, whereas the background emissions are slightly higher. Implementation of the effect of aggregates caused a decrease in the simulated annual emissions of more than 40%. The new parameterization also significantly improved the model performance to simulate observed N2O fluxes. Aggregates have more impact on the reduction of N2O than on the production of N2O. Reduction of N2O is more sensitive to changes in the drivers than production of N2O and is in that sense the key process to understand N2O emissions from denitrification. The effects of changing conditions on reduction of N2O relative to N2O production is dependent on the NO3 content of the soil. It is expected that in soils with a low NO3 content the influence of aggregates on the NO3 concentration is not negligible. This study showed that the current knowledge of the hydrological, biogeochemical and physical processes is sufficient to understand the observed N2O fluxes from a fertilized peatland. Further research is needed to test how aggregates affect the N2O fluxes in areas or periods with little NO3 in the soil.
Analysis of coupled GHG fluxes in different ecosystems
Stolk, Petra - \ 2011
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