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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    Global land cover map validation, comparison and integration for different user communities
    Tsendbazar, N.E. - \ 2016
    Wageningen University. Promotor(en): Martin Herold, co-promotor(en): Sytze de Bruin. - Wageningen : Wageningen University - ISBN 9789462577817 - 164
    land use - maps - geoinformation - ground cover - earth system science - remote sensing - landgebruik - kaarten - geoinformatie - grondbedekking - aardsysteemkunde - remote sensing
    Observation of global-scale land cover is of importance to international initiatives, governments, and scientific communities that endeavour to understand and monitor changes affecting the environment. Various applications such as climate models, ecosystem modelling and hydrological models use a number of global land cover (GLC) maps that were produced from different initiatives. The users have different requirements regarding spatial, temporal and thematic aspects of GLC maps as well as their accuracy. For example, climate modellers typically use GLC maps at 1km spatial resolution or coarser whereas this resolution is too coarse for land change science studies to detect small-scale changes. Furthermore, to determine the fitness of GLC maps for certain applications, map accuracy assessments need to consider the perspectives of the users as confusion between certain classes can have a strong impact on specific applications whereas for other applications they are inconsequential. Therefore, generation and assessment of GLC maps needs to account for different user requirements and perspectives. This PhD research aimed to account for different user requirements in assessing, comparing and as well as improving GLC maps.

    Firstly, the characteristics of current GLC reference datasets that have been used for calibration and validation of GLC maps were reviewed and analysed. Findings revealed varying GLC reference dataset suitability levels depending on the reference data characteristics, user requirements and target maps. Nonetheless, several datasets (LC-CCI, GOFC-GOLD, FAO-FRA and Geo-Wiki) were identified as generally being suitable for re-use for multiple user groups. This highlights the potentiality of GLC reference datasets for multiple uses and public access of existing reference datasets in improving the usability of the datasets outside their intended use.

    Secondly, a comparative assessment of thematic accuracies of GLC maps based on an existing reference dataset was conducted. The Globcover-2005 reference dataset was processed to assess and compare Globcover, LC-CCI and MODIS maps for the year 2005. These maps were evaluated from the perspective of several user applications using a weighted accuracy assessment procedure. Overall accuracies of the maps ranged between 61.3 ± 1.5% and 71.4 ± 1.3%. The overall weighted accuracy varied between 80-92% for the considered applications. The latter accuracy is higher because confusions between some classes were deemed inconsequential for the applications considered. To determine fitness of use of GLC maps, accuracy of GLC maps should be assessed per application; there is no single-figure accuracy estimate expressing map fitness for all purposes.

    Thirdly, this research assesses the spatial accuracy of Globcover-2009, Land Cover-CCI-2010, MODIS-2010 and Globeland30 in Africa using publicly available GLC reference datasets. Spatial accuracy was modelled by the spatial autocorrelation structures of the local correspondence between map and reference data. Created correspondence maps showed spatial patterns indicating zonal differences in the degree with which different GLC maps matched the reference data. The results showed the potentiality of integrating current GLC maps along with reference data to create an improved GLC map. Different integration methods including geostatistical approaches were tested and assessed by cross-validation. The integration methods based on geostatistical approach resulted in 4.5%–13% higher correspondence with the reference LC than any of the input GLC maps. An improved GLC map was presented based on the based integration method. This GLC map has 10% higher global correspondence with reference LC than the individual input maps.

    Figure 1. The integrated GLC map

    Lastly, the thematic requirements of different GLC map users was addressed and a concept of producing GLC maps with user-specific legends based on area fraction maps of LC classes is proposed. It is demonstrated by creating GLC maps with user-specific legends from the perspectives of land system modelling and biodiversity assessments. This PhD research demonstrates the importance of accounting for the requirements and perspectives of user applications in validating, comparing and improving GLC maps. The work also includes improving the efficient use of existing GLC reference datasets, comparative accuracy assessment of GLC maps using both the design based and model based approaches as well as presenting an integration method to improve current GLC maps to better meet different application needs.

    Effect of the land surface on precipitation events in the Netherlands
    Daniels, E.E. - \ 2012
    Kennis voor Klimaat
    aardoppervlak - grondbedekking - neerslag - nederland - land surface - ground cover - precipitation - netherlands
    Factsheet about a research project investigating the influence of the land surface and (historical) land cover changes on regional precipitation events.
    Habitat landscape pattern and connectivity indices : used at varying spatial scales for harmonized reporting in the EBONE project
    Estreguil, C. ; Caudullo, G. ; Whitmore, C. - \ 2012
    Wageningen : Alterra, Wageningen-UR (Alterra-rapport 2297) - 80 p.
    landschapsanalyse - patronen - habitats - grondbedekking - cartografie - landschapsecologie - biodiversiteit - west-europa - landscape analysis - patterns - habitats - ground cover - mapping - landscape ecology - biodiversity - western europe
    This study is motivated by biodiversity related policy information needs on ecosystem fragmentation and connectivity. The aim is to propose standardized and repeatable methods to characterize ecosystem landscape structure in a harmonized way at varying spatial scales and thematic resolutions (habitat in situ versus land cover satellite based observations). Habitat landscape pattern was assessed in terms of configuration, interface mosaic context and structural/functional connectivity on the basis of three available conceptual models (morphological analysis, landscape composition moving window, network graph theory) that were customized, automated and partly combined. Input data were from the EBONE General Habitat Categories maps available over sixty 1 km2 in-situ samples at fine scale (400 m2 Minimum Mapping Unit). Demonstration focused on the focal forest phanerophyte habitat. Forest spatial pattern, edge interfaces and connectivity related maps and indices were obtained for all samples, and then reported per European Environmental Zones. A prototype web-based mapping client (http://forest.jrc.ec.europa.eu/ebone) was also developed to view and query the map layers and indices. Finally, the same models and indices were applied to the satellite based European and regional land cover maps available at broad (25 ha MMU) and medium (1ha MMU) scales. Differences in patterns across the three scales were highlighted over the only common 1 km2 analysis unit. Further, the satellite based patterns were reported at the more suitable fixed area grid of 25 km x 25 km. The overlay with the 1 km2 in situ habitat pattern enabled to inform the macro-scale landscape structure context of the squares and compare with their micro-scale pattern. Such study should be repeated to study spatio-temporal patterns relationships across scales once multi-temporal and larger in situ dataset will be available.
    Groene grondbedekking in de biologische boomkwekerij
    Pronk, A.A. ; Groeneveld, R.M.W. - \ 2010
    Wageningen : Plant Research International (Rapport / Plant Research International 339) - 36
    boomteelt - boomkwekerijen - bomen - grondbedekking - bodembedekkende planten - onkruidbestrijding - bodemvruchtbaarheid - stikstof - klavers - raphanus sativus - vruchtbomen - arboriculture - forest nurseries - trees - ground cover - ground cover plants - weed control - soil fertility - nitrogen - clovers - raphanus sativus - fruit trees
    In deze studie zijn een aantal aspecten van een groene bedekking in de boomkwekerij onderzocht. Hierbij waren een goede gewasproductie en onkruidbeheersing steeds de prioriteit, maar is ook gekeken naar de bodemvruchtbaarheid en de stikstofvoorziening. Verschillende groene bedekkingen zijn getest in het rustjaar. In de bestaande teelt van vruchtbomen is klaver als ondergroei gezaaid. Uit het onderzoek blijkt dat bladrammenas een goede keuze is als groene bedekking in het rustjaar. Vooralsnog is een groene bedekking bij de tweejarige teelt van vruchtbomen een goede methode voor de beheersing van het onkruid, maar is het opbrengstverlies nog te hoog om deze methode te introduceren in de praktijk.
    Effects of spatial variation in land cover on N2O emission of Dutch fen meadow systems
    Nol, L. ; Verburg, P.H. ; Heuvelink, G.B.M. - \ 2008
    ruimtelijke variatie - grondbeheer - emissie - stikstof - grondbedekking - aardoppervlak - spatial variation - land management - emission - nitrogen - ground cover - land surface
    Poster on effects of spatial variation in land cover on N2O emission of Dutch fen meadow systems
    Optimale plantdichtheid van tulp
    Kool, S.A.M. de - \ 2007
    BioKennis Bollen en sierteelt 1 (2007). - 4
    bloementeelt - bloembollen - tulpen - plantdichtheid - gewasdichtheid - grondbedekking - gewasopbrengst - biologische landbouw - floriculture - ornamental bulbs - tulips - plant density - crop density - ground cover - crop yield - organic farming
    Plantdichtheid is een belangrijke bepalende factor voor de opbrengst van tulpenbollen. Dit kennisbericht geeft richtlijnen voor een optimale plantdichtheid. De teler kan deze richtlijnen aanpassen aan zijn eigen situatie door rekening te houden met het plantsysteem, cultivarkeuze en het gewenste eindproduct.
    Tillering in spring wheat : a 3D virtual plant modelling study
    Evers, J.B. - \ 2006
    Wageningen University. Promotor(en): Paul Struik, co-promotor(en): Jan Vos; B. Andrieu. - Wageningen : s.n. - ISBN 9789085043775 - 159
    triticum aestivum - tarwe - plantenontwikkeling - uitstoeling - plantenmorfologie - modellen - licht - verrood licht - lichtrelaties - optische eigenschappen - bladoppervlakte-index - grondbedekking - triticum aestivum - wheat - plant development - tillering - plant morphology - models - light - far red light - light relations - optical properties - leaf area index - ground cover - cum laude
    cum laude graduation (with distinction)
    Historic land use dynamics in and around Natura2000 sites as indicators for impact on biodiversity; Phase 1 of the BIOPRESS project for the Netherlands
    Hazeu, G.W. ; Mücher, C.A. - \ 2005
    Wageningen : Alterra (CGI-rapport 05-001) - 159
    landgebruik - verandering - remote sensing - biodiversiteit - fotointerpretatie - grondbedekking - statistische gegevens - nederland - vegetatie - kaarten - land use - vegetation - maps - change - remote sensing - biodiversity - photointerpretation - ground cover - statistical data - netherlands
    BIOPRESS is a EC-FP5 research project to support GMES `Global Monitoring for Environment and Security¿. It aims to provide the EU-user community with quantitative information on how changes in land cover and land use have affected the environment and biodiversity in Europe. This report is dealing with the results of the first phase of the BIOPRESS project for the Netherlands. The report concentrates on the selection, acquisition, processing and interpretation of recent and historical aerial photographs, and the production of land use change statistics for the Netherlands. Land cover and land cover change statistics were derived for five windows (30km by 30km) for 1950 and 1990 (scale 1:100.000) and nine transects (2km by 15km) for 1950, 1990 and 2000 (scale 1:20.000). Subsequently, the historic land cover dynamics have been analysed within the Natura2000 sites as well as outside these areas, including descriptions of land cover changes and their related pressures (intensification, abandonment, afforestation and urbanisation) influencing biodiversity.
    Lang-grasbeheer op luchthaven Schiphol : resultaten van een praktijkproef met alternatieve grasveldmengsels
    Geerts, R.H.E.M. ; Korevaar, H. - \ 2004
    Wageningen : Plant Research International (PRI) (Nota / Plant Research International 327) - 32
    graslandbeheer - plantenecologie - vegetatiebeheer - grondbedekking - planthoogte - afsnijhoogte - nederland - noord-holland - grassland management - plant ecology - vegetation management - ground cover - plant height - cutting height - netherlands - noord-holland
    Aardbei onkruidvrij door mix van maatregelen : planttijdstip, mechanische bestrijding en tijdstip stro inbrengen bepalen onkruiddruk
    Schans, D.A. van der; Evenhuis, A. ; Wilms, J.A.M. - \ 2003
    Ekoland 23 (2003)6. - ISSN 0926-9142 - p. 22 - 23.
    aardbeien - biologische landbouw - onkruidbestrijding - onkruiden - gewasbescherming - mechanische methoden - grondbedekking - mulches - stromulches - wieden - ziektebestrijdende teeltmaatregelen - mechanische bestrijding - vollegrondsteelt - strawberries - organic farming - weed control - weeds - plant protection - mechanical methods - ground cover - mulches - straw mulches - weeding - cultural control - mechanical control - outdoor cropping
    PPO onderzocht in 2002 verschillende combinaties van methoden van onkruidbestrijding in de vroege en late productieteelt van biologische aardbeien. De effecten van planttijdstip (april en juni), mechanische bestrijding (schoffelen plus vingerwieder, of eggen), bodembedekking met plastic of gehakseld stro, en dikte van het strodek op de aantallen onkruiden, wiedarbeid en opbrengst. Bij een late teelt is ook een vals zaaibed effectief; een torsiewieder kan beter niet toegepast worden wegens plantverlies
    Het gewicht van bedekking. Optimalisatie van de berekening van gewogen gemiddelde indicatiewaarden voor vegetatieopnamen
    Käfer, J. - \ 2002
    Wageningen : Wageningen Universiteit (Rapport / Wageningen Universiteit, Omgevingswetenschappen, Sectie Waterhuishouding 112) - 90
    vegetatie - bodemaciditeit - bodemwater - grondbedekking - indicatoren - habitats - ecohydrologie - vegetation - soil acidity - soil water - ground cover - indicators - habitats - ecohydrology
    In deze studie wordt gezocht naar een optimale methode voor het berekenen van gemiddelde indicatiewaarden voor vocht en zuurgraad met de indicatiewaarden van Ellenberg en het ecotopensysteem. Daarbij zijn drie bestaande methoden (geen weging, weging met bedekkingspercentages en weging met behulp van de gemodificeerde Braun-Blanquet schaal) met elkaar vergeleken.
    Actief bodembeheer in de Krimpenerwaard; meer inzicht in verontreinigde ophogingen en dempingen
    Boels, D. - \ 2001
    Land + Water 41 (2001)4. - ISSN 0926-8456 - p. 24 - 27.
    soil management - polder soils - damping - polluted soils - risk assessment - random sampling - ground cover - covers - zuid-holland - krimpenerwaard - bodembeheer - poldergronden - dempen - verontreinigde bodems - risicoschatting - willekeurige bemonstering - grondbedekking - bedekkingsmaterialen - zuid-holland - krimpenerwaard
    In de Krimpenerwaard is onderzoek gedaan naar verontreinigde locaties in het landelijk gebied: ophogingen en dempingen met verontreinigd materiaal. Er is een methode ontwikkeld om de risico's te bepalen van verschillende soorten dempingen en om de veiligheid en duurzaamheid van de afdeklagen te beoordelen
    Land cover monitoring; an approach towards pan European land cover classification and change detection
    Boer, M.E. de; Vente, J. de; Mücher, C.A. ; Nijenhuis, W.A.S. ; Thunnissen, H.A.M. - \ 2000
    Delft : BCRS (NRSP-2 Report 00-18) - 110
    remote sensing - landevaluatie - grondbedekking - verandering - detectie - landclassificatie - terreinclassificatie - europa - remote sensing - land evaluation - ground cover - change - detection - land classification - terrain classification - europe
    Veranderingen in de kruidlaag in bosreservaten
    Dort, K.W. van; Bouwma, L.M. ; Broekmeyer, M.E.A. ; Koop, H.G.J.M. - \ 1999
    De Levende Natuur 100 (1999)5. - ISSN 0024-1520 - p. 154 - 157.
    bossen - bosbouw - bosecologie - planten - grondvegetatie - grondbedekking - grasbestand - onderlaag - plantensuccessie - plantengemeenschappen - soortendiversiteit - botanische samenstelling - zandgronden - forests - forestry - forest ecology - plants - ground vegetation - ground cover - herbage - understorey - plant succession - plant communities - species diversity - botanical composition - sandy soils
    Algemene waargenomen trends in de ontwikkeling van de kruidlaag in bossen op voedselarme zandgronden. In de natuurlijke bosdynamiek spelen licht en voedingstoestand een belangrijke sturende rol
    Eerste opname van de ondergroei in het Meetnet Bosvitaliteit
    Dobben, H.F. van; Vocks, M.J.M.R. ; Bouwma, I.M. - \ 1997
    Wageningen : IBN-DLO (IBN - rapport 321) - 29
    bosbouw - grondbedekking - grasbestand - mossen - korstmossen - milieu - verontreiniging - monitoring - achteruitgang, bossen - levensvatbaarheid - nederland - onderlaag - forestry - ground cover - herbage - mosses - lichens - environment - pollution - monitoring - forest decline - viability - netherlands - understorey
    Het toepassen van een strodek op maïspercelen om erosie te beperken
    Geelen, P. ; Steins, E. - \ 1997
    Horst etc. : Praktijkonderzoek voor de Akkerbouw en de Vollegrondsgroenteteelt Zuidoost Nederland [etc.] - 20
    grondbedekking - stro - erosie - maïs - akkergronden - nederland - zuid-limburg - ground cover - straw - erosion - maize - arable soils - netherlands - zuid-limburg
    Influence des arbres agroforestiers sur le sol et la strate herbacée du Sud du Sahel : étude particuliere du phosphore
    Radersma, S. - \ 1996
    Wageningen : AB-DLO (Rapports PSS 26) - 106
    bosbouw - bomen - agroforestry - grondbedekking - grasbestand - bodemvorming - planten - bodemprofielen - bodem - fosfor - onderlaag - forestry - trees - agroforestry - ground cover - herbage - soil formation - plants - soil profiles - soil - phosphorus - understorey
    Het vochtgehalte in de strooisellaag onder verschillende vegetaties in twee grove-dennenopstanden
    Clerkx, A.P.P.M. ; Hees, A.F.M. van - \ 1993
    Wageningen : IBN (IBN - rapport 040) - 34
    bosbouw - bodemwater - permeabiliteit - absorptie - hygroscopiciteit - bosstrooisel - strooisel - grondbedekking - grasbestand - bomen - pinus sylvestris - nederland - onderlaag - utrecht - forestry - soil water - permeability - absorption - hygroscopicity - forest litter - litter (plant) - ground cover - herbage - trees - pinus sylvestris - netherlands - understorey - utrecht
    Effects of acidification, liming and fertilization on the undergrowth of a pine forest stand in central Sweden
    Dobben, H.F. van; Dirkse, G.M. ; Braak, C.J.F. ter - \ 1992
    Wageningen : IBN-DLO (RIN report 92/21) - 26
    bosbouw - bomen - bosschade - zure regen - grondbedekking - grasbestand - kalk - gips - krijtkalk - atmosfeer - luchtverontreiniging - chemicaliën - zweden - onderlaag - bosopstanden - bemesting - forestry - trees - forest damage - acid rain - ground cover - herbage - lime - gypsum - chalk - atmosphere - air pollution - chemicals - sweden - understorey - forest stands - fertilizer application
    Effect van bekalking en bemesting met fosfor, magnesium en kalium op de ondergroei van eiken- en dennenopstanden op arme grond
    Dobben, H.F. van; Vocks, M.J.M.R. - \ 1992
    Wageningen : DLO-IBN (RIN - rapport 92/22) - 20
    biomassa - krijtkalk - mengmeststoffen - kunstmeststoffen - achteruitgang, bossen - bosbouw - grondbedekking - gips - grasbestand - lagenstructuur - kalk - nederland - periodiciteit - plantengemeenschappen - plantensuccessie - synecologie - bomen - vegetatie - levensvatbaarheid - onderlaag - bemesting - bosopstanden - biomass - chalk - compound fertilizers - fertilizers - forest decline - forestry - ground cover - gypsum - herbage - layer structure - lime - netherlands - periodicity - plant communities - plant succession - synecology - trees - vegetation - viability - understorey - fertilizer application - forest stands
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