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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    De PerceelVerdeler: optimaal verdelen van de beschikbare mest op het melkveebedrijf
    Oenema, Jouke ; Verloop, Koos ; Hilhorst, Gerjan - \ 2017
    Wageningen : Wageningen UR Livestock Research (Rapport / Koeien & Kansen 78) - 25
    melkvee - melkveehouderij - rundveemest - kunstmeststoffen - ruimtelijke verdeling - dairy cattle - dairy farming - cattle manure - fertilizers - spatial distribution
    Impact of trophic ecologies on the whereabouts of nematodes in soil
    Quist, Casper W. - \ 2017
    Wageningen University. Promotor(en): J. Bakker, co-promotor(en): J. Helder. - Wageningen : Wageningen University - ISBN 9789463430814 - 129
    nematoda - spatial distribution - soil fauna - biota - trophic levels - food webs - soil ecology - soil biology - farming systems - soil types (ecological) - geostatistics - nematoda - ruimtelijke verdeling - bodemfauna - biota - trofische graden - voedselwebben - bodemecologie - bodembiologie - bedrijfssystemen - bodemtypen (ecologisch) - geostatistiek

    Soil life is highly diverse, and ecologically intricate due to myriad of biotic interactions that take place. Terrestrial nematodes have a high potential to serve as an effective and policy-relevant indicator group for ecosystem functioning and soil biodiversity. The work described in this thesis contributed to the robust mapping of nematode communities at scales relevant in both agronomic and environmental contexts. The overarching aim of the work described in this thesis was to contribute to a sound exploration of the potential of nematode communities as an indicator group for the biological condition of soils. Therefore, the distributions of a wide range of nematode taxa were studied, within and between trophic groups and in soils conditioned by various plant species and/or farming systems.

    In Chapter 2 nematode taxon-specific qPCR assays were used to pinpoint responses of nematode communities to invasive plant species Solidago gigantea in two invaded ecosystems: semi-natural grasslands and riparian floodplains. Nematode communities and fungal biomass were examined in adjacent invaded and uninvaded patches. The dominant presence of the invasive plant causes a decrease of plant species-richness and diversity, and an about twofold increase of fungal biomass. Only the density of a single group of fungivorous nematodes (Aphelenchoididea) increased, whereas the densities of two other, phylogenetically distinct lineages of fungivorous nematodes, Aphelenchidae and Diphtherophoridae, were unaffected by the local increase in fungal biomass. Apparently S. gigantea induces a local asymmetric boost of the fungal community, and only Aphelenchoididae were able to benefit from this change induced by the invasive plant.

    In Chapter 3 the outcome is shown of a test whether farming system effects are mirrored in compositional changes in nematode communities. The long-term impact of three farming systems (conventional, integrated and organic) on nematode communities was investigated at the Vredepeel, an experimental farm in the southeastern part of The Netherlands. The results showed that organic farming causes specific shifts in nematode community composition, exceeding the usually large crop-related assemblage shifts. Strongest effects were observed for the (putative) bacterivore Prismatolaimus, which was relatively common in organic fields and nearly absent in conventional and integrated farming. A reverse effect was observed for Pristionchus; this necromenic bacterivore and facultative predator made up about 7 – 21% of the total nematode community in integrated and conventional farming, whereas it was nearly absent from organic fields. The observed farming system effects suggest that specific nematode taxa might be indicative for the impact of farming practices on soil biota. Knowledge of spatial distribution patterns of soil organisms with distinct trophic preferences will contribute to our understanding of factors that maintain and regulate soil biodiversity, and is essential information to design soil sampling strategies with predictable accuracies.

    Chapter 4 deals with microscale patchiness of 45 nematode taxa (at family, genus or species-level) in arable fields and semi-natural grasslands, on marine clay, river clay or sandy soils. Contrary to our expectations, an increase of the number of cores per composite sample above 3, did not result in more accurate detection for any of the taxa under investigation (range of number of cores per composite sample: 3, 6, 12 or 24). Neither system nor soil type did influence microscale distribution. The insights in the spatial distribution of nematodes at microscale presented here, sheds light on the impact of trophic preferences on the spatial distribution of individual nematode taxa, and will allow for the design of statistically sound soil sampling strategies.

    Chapter 5 shows belowground distribution patterns of 48 nematode taxa in 12 visually homogeneous fields (each 100 x 100 m) on three soil types (marine clay, river clay and sand) and two land-use types (arable and natural grasslands) across the Netherlands. Over 35,000 nematode-taxon specific qPCR assays allowed us to quantitative analyse nematode taxa at family, genus or species level in over 1,200 soil samples. A sampling scheme was optimized for Bayesian geostatistical analysis (Integrated nested Laplace approximations; INLA). Multivariate analysis show soil type and land-use related differences in the nematode community composition, which underline the effects of environmental filtering and niche partitioning of nematodes. All individual nematode taxa together show a wide range of degrees of spatial variabilities were found (expressed by the range-parameter and the spatial variance parameter (s2spatial). No general effects were detected of soil characteristics or nematode traits (cp-value, trophic group, weight) on the spatial distribution parameters. The relatively high percentages of unexplained spatial variability – 92.5% of the variation for the range-parameter and 74% for spatial variance (s2spatial) – point at a major role of stochasticity for variability of nematode densities within fields. This study adds empirical evidence that distribution patterns of terrestrial nematodes, in areas without noticeable gradients, are driven by neutral / stochastic processes, within the boundaries set by the environment.

    In the final Chapter 6, I discuss the opportunities and challenges of the use of molecular tools in soil ecological research, the impact of trophic preferences on the whereabouts of nematodes, the use of nematode communities as indicator for soil condition and how this might be developed and applied to facilitate more sustainable ecosystem management.

    Spatial distribution and habitat preference of harbour seals (Phoca vitulina) in the Dutch North Sea
    Aarts, Geert ; Cremer, Jenny ; Kirkwood, Roger ; Wal, Jan Tjalling van der; Matthiopoulos, Jason ; Brasseur, Sophie - \ 2016
    Den Helder : Wageningen Marine Research (Wageningen Marine Research rapport C118/16) - 43
    seals - phoca vitulina - spatial distribution - habitats - animal ecology - marine ecology - north sea - netherlands - zeehonden - phoca vitulina - ruimtelijke verdeling - habitats - dierecologie - mariene ecologie - noordzee - nederland
    Cruise report hydroacoustic survey for blue whiting (Micromesistius poutassou) with F.R.V. Tridens (BWHTS) 23 March - 7 April 2015
    Scoulding, B.C. - \ 2015
    IJmuiden : IMARES (Report / IMARES Wageningen UR 15.008) - 20
    micromestistius poutassou - onderwaterakoestiek - noordoost atlantische oceaan - eu regelingen - visbestand - ruimtelijke verdeling - micromestistius poutassou - underwater acoustics - northeast atlantic - eu regulations - fishery resources - spatial distribution
    This survey is part of the ICES coordinated international hydro acoustic survey for blue whiting which is carried out yearly in March/April. The other participating countries are the Faroe Islands, Ireland, Norway and Russia. IMARES, Institute for Marine Resources & Ecosystem Studies, part of Wageningen University and Research, has participated in the international North-East Atlantic hydro acoustic survey for blue whiting since 2004. The survey is part of the EU Data Collection Framework. The aim of this survey is to provide an abundance estimate of the whole North-East Atlantic blue whiting population and to determine the spatial distribution at this time of year. This estimate is used as a tuning index by the ICES Working Group on Widely Distributed Stocks (WGWIDE) to determine the size of the population. In this report the results are presented of the survey west of Ireland, carried out by FRV “Tridens”. A secondary objective during the survey is to gather information on the distribution of non-commercial mesopelagic species.
    Ruimtelijke spreiding ammoniakemissies 2013
    Koeijer, T.J. de; Luesink, H.H. ; Kuhlman, J.W. ; Puister-Jansen, L.F. ; Hoogeveen, M.W. - \ 2014
    Den Haag : LEI Wageningen UR (Factsheet / LEI Wageningen UR 14-118b2) - 2
    ammoniakemissie - ruimtelijke verdeling - landbouw en milieu - bemesting - begrazing - ammonia emission - spatial distribution - agriculture and environment - fertilizer application - grazing
    Voor de NEC-richtlijn (National Emission Ceiling), GCN/GDN (Grootschalige concentratie- en depositiekaarten) en de PAS (Programmatische aanpak stikstof) monitort de Emissieregistratie de emissies van diverse stoffen. De landbouw levert met 85% de belangrijkste bijdrage aan de emissie van ammoniak. LEI Wageningen UR levert elke drie jaar de regionale emissie van ammoniak uit bemesting en beweiding. De ammoniakemissies worden met MAMBO berekend per gemeente.
    Ruimtelijke optimalisatie van voederstromen in de Peel : nieuwe landgebruiksvormen en clustering ten behoeve van regionale productie van veevoer
    Walsum, P.E.V. van; Galama, P.J. ; Roelsma, J. ; Cormont, A. ; Hack-ten Broeke, M.J.D. - \ 2014
    Wageningen : Alterra, Wageningen-UR (Alterra-rapport 2615) - 49
    melkveehouderij - milieueffect - krachtvoeding - rundveevoeding - voedergewassen - duurzaamheid (sustainability) - ruimtelijke verdeling - nutriëntenuitspoeling - duurzaam bodemgebruik - regionaal landbouwbeleid - veevoederindustrie - de peel - dairy farming - environmental impact - force feeding - cattle feeding - fodder crops - sustainability - spatial distribution - nutrient leaching - sustainable land use - regional agricultural policy - feed industry - de peel
    In een eerdere studie werd verkend in hoeverre het economische en milieutechnisch haalbaar zou zijn om in regio De Peel krachtvoervervangers regionaal te verbouwen. In de in dit rapport beschreven studie stelden we ons de vraag of ruimtelijke optimalisatie wel tot milieuwinst zou kunnen leiden en vervolgens hoe regionale voercentra kunnen bijdragen en op welke locatie deze zouden moeten liggen.
    The landscape at your service : spatial analysis of landscape services for sustainable development
    Gulickx, M.M.C. - \ 2013
    Wageningen University. Promotor(en): Peter de Ruiter, co-promotor(en): Jetse Stoorvogel; Kasper Kok. - S.l. : s.n. - ISBN 9789461736871 - 143
    ecosysteemdiensten - ruimtelijke verdeling - landschapselementen - gebiedsgericht beleid - cartografie - plattelandsplanning - scenario planning - multi-stakeholder processen - landschapsplanning - noord-brabant - intensieve veehouderij - grondwaterkwaliteit - zandgronden - de peel - ecosystem services - spatial distribution - landscape elements - integrated spatial planning policy - mapping - rural planning - scenario planning - multi-stakeholder processes - landscape planning - noord-brabant - intensive livestock farming - groundwater quality - sandy soils - de peel
    De mens beheert en verandert het landschap om diverse producten en diensten te verkrijgen en te versterken. Deze producten en diensten, landschapsdiensten genoemd, leveren een positieve bijdrage aan de maatschappij. Interacties tussen sociale (menselijke) en ecologische (natuurlijke) systemen maken de voorziening van Landschapsdiensten mogelijk. In het landschap zijn er synergiën en conflicten tussen diensten, waardoor keuzes gemaakt moeten worden, oftewel we hebben te maken met trade‐offs tussen diensten. De interactie tussen de systemen, samen met de ruimtelijke verwevenheid van de diensten zorgen voor hoge complexiteit. Kaarten van landschapsdiensten kunnen deze complexiteit, of een deel daarvan, helder weergeven en daardoor bijdragen aan een beter begrip van de interacties en bijkomende trade‐offs. Dit begrip helpt ons bij het voorkomen van conflicten tussen diensten en geeft ons betere mogelijkheden om gewenste diensten te versterken. Voornamelijk ruimtelijke planners en beleidsmakers hebben veel baat bij deze informatie. Geschikte kaarten van landschapsdiensten zijn daarom van groot belang. Meer onderzoek is nodig naar ruimtelijk relaties om zodoende landschappelijke elementen te identificeren die kunnen fungeren als indicatoren voor het karteren van landschapsdiensten. Voor de gemeenten Deurne en Asten zijn de landschapsdiensten moerashabitat, bosrecreatie, grondgebonden veehouderij en wandelrecreatie in kaart gebracht. Met behulp van veldwerk zijn voor 389 locaties de landschapsdiensten geïdentificeerd. Een ruimtelijke analyse gemaakt van de grondwaterkwaliteit in relatie tot landschappelijke elementen, landgebruik en landschapsdiensten. De studie is uitgevoerd voor het zuidelijk zandgebied in de regio de Peel in Nederland.
    Fishing activities on the Dogger Bank 2006-2011
    Bartelings, H. ; Hamon, K.G. ; Oostenbrugge, J.A.E. van - \ 2013
    The Hague : LEI, part of Wageningen UR (Memorandum / LEI : Research area Natural resources ) - 45
    visserij-ecologie - ruimtelijke verdeling - beschermingsgebieden - noordzee - visserij - vis vangen - fisheries ecology - spatial distribution - conservation areas - north sea - fisheries - fishing
    In 2008, the Minister of Agriculture, Nature and Food Quality notified four proposed Sites of Community In-terest (pSCIs) to the European Commission (for protection as Special Conservation Areas (SCAs) under the Habitats Directive). These areas are the Dogger Bank, Cleaver Bank, the Coastal Zone and the Vlakte van de Raan. The areas have been chosen, based on their specific habitats and ecological values. The objective of the current project is to give insight into the trends of the fishing activities of the Dutch and important foreign fleets (Belgian, German and UK) in the area of the Dogger Bank in the period 2006-2011. In the analyses attention is given to developments in effort, landings and economic value of the landings.
    Biomolecule substrate topography for inkjet printed structures
    Mujawar, L.H. - \ 2013
    Wageningen University. Promotor(en): Willem Norde, co-promotor(en): Aart van Amerongen. - S.l. : s.n. - ISBN 9789461735478 - 145
    microarrays - ruimtelijke verdeling - eiwitten - assays - porositeit - substraten - microarrays - spatial distribution - proteins - assays - porosity - substrates
    Designing food structures to enhance sensory responses
    Mosca, A.C. - \ 2012
    Wageningen University. Promotor(en): Tiny van Boekel, co-promotor(en): Markus Stieger; F. van de Velde. - S.l. : s.n. - ISBN 9789461732477 - 164
    sucrose - vet - sensorische wetenschappen - smaakgevoeligheid - smaak - zintuiglijke waarneming - ruimtelijke verdeling - gels - mechanische eigenschappen - zoetheid - sucrose - fat - sensory sciences - taste sensitivity - taste - organolepsis - spatial distribution - gels - mechanical properties - sweetness

    Background and Aim

    The current overconsumption of sugar, salt and fat has been linked to the incidence of health problems. For this reason, it is necessary to decrease the intake of these food components. In the context of reducing the contents of sugar, salt and fat in food products while maintaining sensorial quality, the aim of this thesis was to identify and understand the factors that affect the perception of taste and fat-related sensory attributes in semi-solid foods. To achieve this aim, the relationship between the spatial distribution of sucrose, the mechanical properties of semi-solid gels and the perception of taste was investigated in detail. In addition, the relationship between the spatial distribution of fat and the perception of fat-related sensory attributes was investigated.

    Methods

    Model systems composed of layers of mixed agar-gelatin gels were used to control the spatial distribution of sucrose and fat. Layers varying in concentration of sucrose or oil-in-water emulsion droplets (i.e. fat) were combined to prepare gels with homogeneous and inhomogeneous distributions of sucrose and fat. A series of experiments were carried out using 2-Alternative Forced Choice (2-AFC) tests, line scale ratings and time-intensity analysis to investigate the effects of modulation of the spatial distribution of sucrose and modulation of the mechanical properties of gels on sweetness intensity. The relationship between the spatial distribution of tastants and consumer preference was investigated in different types of foods (e.g. semi-solid gels, breads and sausages). Furthermore, a Quantitative Descriptive Analysis (QDA) panel was carried out to investigate the effect of modulation of the spatial distribution of fat on the perception of fat-related sensory attributes.

    Results

    An inhomogeneous distribution of sucrose at large sucrose concentration differences enhanced sweetness intensity. The frequency of high-intensity discontinuous stimulation of taste receptors, which is related to the presence of tastant concentration differences in the mouth during oral processing, was identified as the driving factor for taste enhancement. The oral breakdown of semi-solid gels, which is affected mainly by fracture strain, and the mixing behavior of gel fragments formed upon breakdownwere shown to influence the frequency of receptor stimulation and, consequently, taste enhancement. Furthermore, the optimum frequency of high-intensity discontinuous stimulation required to maximize taste enhancement was shown to depend on the textural properties of the gel. These findings suggest that the spatial distribution of tastants and the mechanical properties (especially fracture strain) can be modulatedto maximize taste enhancement. Additionally, consumer preference was found to be maintained or increased in products containing tastants heterogeneously distributed in the food matrix.

    Fat-related mouthfeel attributes, such as spreadable and melting, were enhanced by an inhomogeneous distribution of fat at large fat concentration differences. The presence of high-fat zones on the surface of the model system was shown to maximize the enhancement of attributes related to fat. Therefore, the enhancement of fat-related attributes seems to be driven by the presence of high-fat zones preferably on the surface of the product rather than by the presence of fat concentration differences within the product.

    Conclusions

    The combined effects of modulation of the spatial distribution of tastants and fat and modulation of the mechanical properties can be applied in the development of low-sugar, low-salt and low-fat food products with improved taste quality.

    Modeling patterns of farm diversification in a Dutch landscape
    Pfeifer, C. - \ 2011
    Wageningen University. Promotor(en): Arie Oskam, co-promotor(en): Jetse Stoorvogel; Marthijn Sonneveld; Roel Jongeneel. - [S.l. : S.n. - ISBN 9789085858416 - 144
    diversificatie - landbouwbedrijven - nevenactiviteiten - multifunctionele landbouw - landbouw - landschap - besluitvorming - plattelandsontwikkeling - ruimtelijke verdeling - gelderse vallei - nederland - diversification - farms - ancillary enterprises - multifunctional agriculture - agriculture - landscape - decision making - rural development - spatial distribution - gelderse vallei - netherlands
    In agrarische landschappen zijn het de beslissingen van de agrariërs die medebepalend zijn voor zowel het aanbod als de kwaliteit van de voortgebrachte landschapsdiensten. Het doel van dit proefschrift is inzicht te verschaffen in de ruimtelijke patronen van bedrijfsdiversificatie en na te gaan hoe deze patronen mogelijk in de toekomst zouden kunnen veranderen. De studie richt zich op de Gelderse Vallei
    Duurzame ontwikkeling van de veehouderij in Limburg
    Baltussen, W.H.M. ; Smeets, P.J.A.M. ; Tacken, G.M.L. - \ 2010
    Den Haag : LEI Wageningen UR (Alterra-rapport 2094) - ISBN 9789086154654 - 67
    veehouderij - duurzaamheid (sustainability) - ruimtelijke verdeling - milieueffect - volksgezondheid - attitudes - samenleving - landbouwbeleid - duurzame veehouderij - landbouw als bedrijfstak - limburg - livestock farming - sustainability - spatial distribution - environmental impact - public health - attitudes - society - agricultural policy - sustainable animal husbandry - agriculture as branch of economy - limburg
    Provinciale Staten van Limburg wil inzicht in de belangrijke aspecten om te komen tot een duurzame ontwikkeling van de veehouderij in de provincie Limburg. Op basis van feiten en cijfers over de economische betekenis van het veehouderijcomplex in Limburg, de invloed van de veehouderij op milieu en volksgezondheid en de mening van Limburgers over de veehouderij is met verschillende direct betrokkenen nagedacht over de gewenste duurzame ontwikkeling en hoe deze gerealiseerd kan worden.
    Distribution maps for the North Sea fisheries; Methods and application in Natura 2000 areas
    Oostenbrugge, J.A.E. van; Bartelings, H. ; Buisman, F.C. - \ 2010
    Den Haag : LEI, part of Wageningen UR (Report / LEI : Research area Natural resources ) - ISBN 9789086154593 - 122
    natura 2000 - visserij-ecologie - ruimtelijke verdeling - databanken - noordzee - natura 2000 - fisheries ecology - spatial distribution - databases - north sea
    In the study presented here a database was developed with spatial distribution pattern of fishing effort, catches and catch values of the Dutch and non-Dutch fisheries in the Dutch section of the North Sea. Distribution maps were produced on the basis of this database. In addition, estimates were made of the value of different fisheries in areas designated by the Netherlands as Natura 2000 areas.
    Verspreidingskaarten voor de Noordzeevisserij; Methodiek en toepassing Natura 2000-gebieden
    Oostenbrugge, J.A.E. van; Bartelings, H. ; Buisman, F.C. - \ 2010
    Den Haag : LEI Wageningen UR (Rapport / LEI : Onderzoeksveld Natuurlijke hulpbronnen ) - ISBN 9789086154555 - 121
    visserij - natuurlijke hulpbronnen - ruimtelijke verdeling - noordzee - natura 2000 - visvangsten - fisheries - natural resources - spatial distribution - north sea - natura 2000 - fish catches
    In het hier gepresenteerde onderzoek is een database ontwikkeld met de ruimtelijke verspreidingspatronen van visserijinzet, vangsten en vangstwaardes van de Nederlandse en buitenlandse visserijen in het Nederlandse deel van de Noordzee. Op basis van deze database zijn verspreidingskaarten gemaakt. Daarnaast zijn schattingen gemaakt van de waarde van verschillende visserijen in gebieden die door Nederland zijn aangewezen als Natura 2000-gebieden.
    Explaining agricultural intensity at the European and global scale
    Neumann, K. - \ 2010
    Wageningen University. Promotor(en): Tom Veldkamp; Peter Verburg. - [S.l. : S.n. - ISBN 9789085857099 - 168
    landgebruik - veehouderij - intensieve landbouw - intensivering - wiskundige modellen - geografische informatiesystemen - ruimtelijke verdeling - variatie in de tijd - europa - wereld - land use - livestock farming - intensive farming - intensification - mathematical models - geographical information systems - spatial distribution - temporal variation - europe - world
    Op Europese schaal is een analyse gedaan om de ruimtelijke verdeling van vijf verschillende soorten dieren te verklaren. Locatiefactoren voor de aanwezigheid van: melkvee, vleesvee en schapen (herbivoren), alsmede varkens en pluimvee werden werden onderzocht en gebruikt om de ruimtelijke verdeling van de veedichtheid te karteren.
    Verbetering van de lichtonderschepping in een tomatengewas door aanpassing van de rijstructuur: Effecten van de rijstructuur op lichtverdeling, fotosynthese en productie
    Dueck, T.A. ; Nederhoff, E.M. ; Nieboer, S. ; Scheffers, C.P. ; Steenhuizen, J.W. ; Chizhmak, S. ; Uenk, D. ; Sarlikioti, V. ; Visser, P.H.B. de - \ 2010
    Wageningen : Wageningen UR Greenhouse Horticulture (Rapport GTB 1029) - 46
    solanum lycopersicum - tomaten - kasgewassen - teelt onder bescherming - cultuurmethoden - licht - interceptie - ruimtelijke verdeling - adaptatie - positie - effecten - fotosynthese - solanum lycopersicum - tomatoes - greenhouse crops - protected cultivation - cultural methods - light - interception - spatial distribution - adaptation - position - effects - photosynthesis
    Doel van dit project was te onderzoeken wat het effect is van de rijstructuur op de lichtverdeling en fotosynthese van een tomatengewas, en de effecten daarvan op de productie. Ook werd gekeken of de bladstand en de fotosynthesecapaciteit van de bladeren zich aanpassen aan wijzigende lichtverdeling. Tevens werd de hypothese getest of alternatieve vormen van tussenplanten zouden leiden tot lagere verdamping en dus tot energiebesparing. Verder is gekeken naar het effect op productie van twee substraten, namelijk kokosmatten type ‘Profit’ van Van der Knaap, en steenwolmat type ‘Master Dry’ van Grodan.
    Spatial distribution of economic viability of regional biomass chains: a case study of bioethanol production in the North of the Netherlands
    Hilst, F. van der; Dornburg, V. ; Faaij, A. ; Sanders, J.P.M. ; Elbersen, H.W. - \ 2009
    landgebruik - brandstofgewassen - suikerbieten - miscanthus - economische haalbaarheid - ruimtelijke verdeling - regionale verkenningen - bioethanol - land use - fuel crops - sugarbeet - miscanthus - economic viability - spatial distribution - regional surveys - bioethanol
    The objective of this work is to assess the viability of regional biomass chains. The economic performance of potential bioenergy cropping systems is compared to the performance of current agricultural land use. Furthermore, bioethanol production costs are compared to average gasoline prices. Spatial heterogeneity of physical conditions is taken into account to determine the spatial variation in economic viability of bioenergy chains. The regional biomass chains assessed in this study are ethanol production from Miscanthus and from sugar beet in the North of the Netherlands. The competitiveness of bio energy crops is assessed by calculating the Net Present Value (NPV) of currently applied rotation schemes, rotation schemes including an additional share of sugar beet and of Miscanthus. Costs of ethanol production are calculated taking into account costs of domestically cultivated crops, transport and conversion. The NPV’s and cost of ethanol are calculated for seven categories of soil suitability. The spatial distribution of soil properties and current land use is used to map the spatial variation in competiveness and production costs using GIS (Geographical information System). Such a detailed spatial distribution of economic viability of bioenergy chains indicates were land use changes are most likely to occur. The results show that both perennial bioenergy crops as well as an increased share of sugar beet are not competitive with current cropping systems when soil is equally suitable. However, on soils less suitable for annual crops yet quite suitable for less intensive managed crops, Miscanthus achieves a better NPV than common rotations. The method applied in this paper contributes to the identification of promising locations for bioenergy crops and could be applied to several regions and/or levels of analysis.
    Puzzelen met de ruimte in Limburg; Ruimteclaims in het Limburgs landelijkgebied
    Vogelzang, T.A. ; Gies, T.J.A. ; Michels, R. ; Wisman, J.H. ; Hoefs, R. ; Smidt, R.A. - \ 2009
    Den Haag/Wageningen : LEI Wageningen UR / Alterra (Rapport / LEI 2009-090) - ISBN 9789086153985 - 134
    regionale planning - regionale ontwikkeling - landgebruik - landgebruiksplanning - ruimtelijke verdeling - landbouw - industrie - infrastructuur - milieu - nederland - gebiedsgericht beleid - limburg - regional planning - regional development - land use - land use planning - spatial distribution - agriculture - industry - infrastructure - environment - netherlands - integrated spatial planning policy - limburg
    In de provincie Limburg is er steeds meer discussie tussen overheden, de landbouwsector en maatschappelijke organisaties over de inrichting van het landelijk gebied in relatie tot de landbouwproductieruimte en andere maatschappelijke gewenste opgaven (groene, blauwe, maar ook rode opgaven). De provincie Limburg wilde graag door uitvoering van een strategisch onderzoek inzicht en ondersteuning in de vraag welke maatregelen en instrumenten ontbreken c.q. tekortkomen in het provinciale beleid om de landbouwsector in Limburg taken voor de (mede)realisatie van landschap, natuur, milieu en wateropgaven met verve op te laten pakken. In dit rapport wordt verslag gedaan van dat onderzoek. There has been increasing discussion between government authorities, the agricultural sector and social organisations in the province of Limburg about rural management with respect to the area required for agricultural production and other socially desirable objectives (green, blue as well as red issues). Using strategic research, the province of Limburg wanted to gain insight and support regarding the measures and instruments that were lacking or not sufficiently available in provincial policy to enable the agricultural sector in Limburg to dynamically take on tasks to achieve landscape, nature, environment and water objectives. This report discusses that research.
    Modelling habitat preference and estimating the spatial distribution of Australian Sea Lions (Neophoca cinerea); "A first exploration "
    Aarts, G.M. ; Brasseur, S.M.J.M. - \ 2008
    Texel : IMARES (Report / Wageningen IMARES C107/08) - 18
    neophoca cinerea - ruimtelijke verdeling - populatie-ecologie - telemetrie - mitigatie - interacties - visserij - ruimtelijke ecologie - neophoca cinerea - spatial distribution - population ecology - telemetry - mitigation - interactions - fisheries - spatial ecology
    Managing the Australian sea lion (Neophoca cinerea) population and mitigating its interactions with commercial fisheries, requires an understanding of their spatial distribution and habitat preference at sea. Numerous wildlife telemetry devices have been attached to individual seals from different colonies, providing a detailed insight into there movement and activities. However, as data are only available from some individuals from 16 of 40 colonies in South Australia, these data represents only a small proportion of the population. Moreover, some colonies are poorly represented. To estimate the spatial distribution of the entire South Australian population, one can first investigate why individuals visit certain places and use this information to predict the spatial distribution for other regions lacking data. In this study we fit Generalized Additive Mixed Models (GAMMs) to wildlife telemetry data collected from adult female Australian sea lions to investigate the species’ habitat preference for the variables distance to the colony, depth and slope. The results show that in general they have a higher preference for shallow areas, places close to the colony and a steep slope, but they also display large individual variability. Preference for these variables does not seem to differ between individuals of different sizes. In some of the most western colonies, some individuals seem to spend more time further away from the colony, but apart from this, there is no apparent effect of the longitudinal capture position on preference. The predicted spatial distribution is largely driven by the distance from the departure colony and the actual distribution of individuals among the different colonies. Although depth and slope does seem to effect their distribution to some extent, the most important variables that explain fine-scale foraging activities at-sea are probably missing. Future studies using GPS transmitters attached to animals, that yield high resolution locations and more detailed environmental data, in combination with the analytical technique presented here, should provide more insight there foraging decisions. This should eventually also improve the spatial prediction of the population as a whole.
    Ruimtelijke dynamiek van weidevogelpopulaties in relatie tot de kwaliteit van de broedhabitat. Welke factoren beïnvloeden de vestiging van weidevogels?
    Kleijn, D. ; Berendse, F. ; Verhulst, J. ; Roodbergen, M. ; Klok, T.C. ; Veer, R. van 't - \ 2008
    Ede : Directie Kennis, Ministerie van Landbouw, Natuur en Voedselkwaliteit (Alterra-rapport nr. 1579) - 37
    vogels - broedvogels - habitats - ruimtelijke verdeling - weidevogels - natuurbeleid - birds - breeding birds - habitats - spatial distribution - grassland birds - nature conservation policy
    Recent onderzoek toonde aan dat percelen met een uitgestelde maaidatum geen hogere dichtheden weidevogels herbergen dan gangbaar, vroeg gemaaide percelen. Deze resultaten zijn moeilijk te verklaren aan de hand van bestaande kennis over ruimtelijke dynamiek en nestplaatskeuze van weidevogels. Deze studie heeft tot doel vast te stellen of de nestplaatsen van weidevogels ruimtelijke geassocieerd zijn met één of meerdere omgevingsvariabelen in de vestigingsfase. Voor de grutto werd daarnaast nog gekeken of de aanleg van plas-dras percelen leidt tot een verhoging van het aantal broedparen in de nabijheid van deze percelen en wat de invloedssfeer is van deze percelen (waar broeden de grutto’s die gebruik maken van een plas-dras perceel?).
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