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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Monitoring cod catches of the Dutch demersal fleet in 2016
Hal, R. van; Machiels, M.A.M. - \ 2017
IJmuiden : Wageningen Marine Research (Wageningen Marine Research Report C056/17) - 29
monitoring - cod - beam trawling - pulse trawling - demersal fisheries - marine fisheries - fish catches - north sea - gadus morhua - kabeljauw - boomkorvisserij - pulsvisserij - demersale visserij - zeevisserij - visvangsten - noordzee
This report presents the results of the cod monitoring program 2016. The research was commissioned by the Dutch Ministry of Economic Affairs within the EZ-program Beleidsondersteunend Onderzoek. Cod catches of the vessels in the fleet segments BT2 (beam trawl and pulse trawl) and TR (otter trawls and seines) need to be monitored yearly, due to the Dutch implementation of the European cod recovery plan. The European cod recovery plan restricts the fishing effort of European fleets catching cod. Fishing effort, based on historical track records, is allocated to different gear groups. Fishing effort can be transferred between gear groups by use of conversion factors. In the Netherlands fishing effort is transferred yearly from the BT2 gear group to the TR group, based on a national conversion factor of 1:3 (BT:TR) kWdays instead of the European conversion factor of 1:16. This is because the cod catches in the Dutch TR fleet are not as high as the European conversion factor implies. In order to substantiate for the national conversion factor, the Dutch government is obliged to report cod catches per unit of effort (CpUE) of the vessels in these gear groups to the European Commission. An overview is provided of the fishing activity, the cod landings and the cod landings per unit of effort of the various gear categories in the BT2 and the TR fleet segments during the year 2016. First the cod Catch per Unit of Effort (CpUE) transition ratio between the BT2 on the one hand and the TR1C plus TR2 fleet segments on the other hand was calculated. And secondly the percentage of cod avoidance trips – trips during which 5% or less cod was caught – in the TR-fleet were calculated. The TR fleet has a higher cod CpUE on average than the BT fleet. When the cod targeted fisheries (TR1AB) are not taken into account, the CpUE effort transition ratio (TR1C+TR2): BT2 of 2016 lies between 4.2:1 and 5.7:1, depending on whether the ratio is calculated on the basis of minimum or maximum cod discards estimation by the Scientific, Technical and Economic Committee for Fisheries (STECF) respectively whereby in the minimum calculation the vessels participating in the CCTV program are excluded. Based on average discards estimations including all vessels, the ratio is 5.1:1. The percentage of cod avoidance trips, fishing trips with 5% cod or less in the total catches, in the TR1C and the TR2 fleets were 94% and 96% in 2016 respectively. These percentages are based on average STECF cod discards estimations. When minimum or maximum discards estimations are used, the calculated percentages of cod avoidance trips does not vary more than 2 or 3% from the percentage based on average estimations.
New feed ingredients : the insect opportunity
Raamsdonk, L.W.D. van; Fels-Klerx, H.J. van der; Jong, J. de - \ 2017
Food Additives & Contaminants. Pt. A, Chemistry, Analysis, Control, Exposure & Risk Assessment 34 (2017)8. - ISSN 1944-0049 - p. 1384 - 1397.
energy balance - energy conversion - environment - feed safety - fraud - Insect - label control - legislation - monitoring - novel protein source - traceability - WISE
In the framework of sustainability and a circular economy, new ingredients for feed are desired and, to this end, initiatives for implementing such novel ingredients have been started. The initiatives include a range of different sources, of which insects are of particular interest. Within the European Union, generally, a new feed ingredient should comply with legal constraints in terms of ‘yes, provided that’ its safety commits to a range of legal limits for heavy metals, mycotoxins, pesticides, contaminants, pathogens etc. In the case of animal proteins, however, a second legal framework applies which is based on the principle ‘no, unless’. This legislation for eradicating transmissible spongiform encephalopathy consists of prohibitions with a set of derogations applying to specific situations. Insects are currently considered animal proteins. The use of insect proteins is a good case to illustrate this difference between a positive, although restricted, modus and a negative modus for allowing animal proteins. This overview presents aspects in the areas of legislation, feed safety, environmental issues, efficiency and detection of the identity of insects. Use of insects as an extra step in the feed production chain costs extra energy and this results in a higher footprint. A measure for energy conversion should be used to facilitate the comparison between production systems based on cold- versus warm-blooded animals. Added value can be found by applying new commodities for rearing, including but not limited to category 2 animal by-products, catering and household waste including meat, and manure. Furthermore, monitoring of a correct use of insects is one possible approach for label control, traceability and prevention of fraud. The link between legislation and enforcement is strong. A principle called WISE (Witful, Indicative, Societal demands, Enforceable) is launched for governing the relationship between the above-mentioned aspects.
Space-time monitoring of tropical forest changes using observations from multiple satellites
Hamunyela, Eliakim - \ 2017
University. Promotor(en): Martin Herold, co-promotor(en): Jan Verbesselt. - Wageningen : Wageningen University - ISBN 9789463436403 - 188
tropical forests - monitoring - satellites - deforestation - ecological disturbance - tropische bossen - satellieten - ontbossing - ecologische verstoring

Forests provide essential goods and services to humanity, but human-induced forest disturbances have been on ongoing at alarming rates, undermining the capacity for forests to continue providing essential goods and services. In recent years, the understanding of the short-term and long-term impacts of deforesting and degrading forest ecosystems has improved, and global efforts to reduce forest loss are ongoing. However, in many parts of the globe, significant forest areas continue to be lost. To fully protect forest ecosystems efficiently, timely, reliable and location-specific information on new forest disturbances is needed. Frequent and large-area forest mapping and monitoring using satellite observations can provide timely and cost-effective information about new forest disturbances. However, there are still key weaknesses associated with existing forest monitoring systems. For example, the capacity for forest monitoring systems to detect new disturbances accurately and timely is often limited by persistent cloud cover and strong seasonal dynamics. Persistent cloud can be addressed by using observations from multiple satellite sensors, but satellite sensors often have inter-sensor differences which make integration of observations from multiple sensors challenging. Seasonality can be accounted for using a seasonal model, but image time series are often acquired at irregular intervals, making it difficult to properly account for seasonality. Furthermore, with existing forest monitoring systems, detecting subtle, low-magnitude disturbances remains challenging, and timely detection of forest disturbances is often accompanied by many false detections. The overall objective of this thesis is to improve forest change monitoring by addressing the key challenges which hinders accurate and timely detection of forest disturbances from satellite data. In the next paragraphs, I summarise how this thesis tackled some of the key challenges which hamper effective monitoring of forest disturbances using satellite observations.

Chapter 2 addresses the challenge of seasonality by developing a spatial normalisation approach that allows us to account for seasonality in irregular image time series when monitoring forest disturbances. In this chapter, I showed that reducing seasonality in image time series using spatial normalisation leads to timely detection of forest disturbances when compared to a seasonal model approach. With spatial normalisation, near real-time forest monitoring in dry forests, which has been challenging for many years, is now possible. Applying spatial normalisation in areas where evergreen and deciduous forests co-exist is however challenging. Therefore, further research is needed to improve the spatial normalisation approach to ensure that it is applicable to areas with a combination of different forest types. In particular, a spatial normalisation approach which is forest type-specifics is desirable. In this chapter, forest disturbances were detected by analysing single pixel-time series. Spatial information was only used to reduce seasonality.

Taking in account the fact that forest disturbances are spatio-temporal events, I investigated whether there is an added-value of combining both spatial and temporal information when monitoring forest disturbances from satellite image time series. To do this, I first developed a space-time change detection method that detects forest disturbances as extreme events in satellite data cubes (Chapter 3). I showed that, by combining spatial and temporal information, forest disturbances can still be detected reliably even with limited historical observations. Therefore, unlike approaches which detect forest disturbances by analysing single pixel- time series, the space-time approach does not require huge amount of historical images to be pre-processed when monitoring forest disturbances. I then evaluated the added-value of using space-time features when confirming forest disturbances (Chapter 4). I showed that using a set of space-time features to confirm forest disturbances enhance forest monitoring significantly by reducing false detections without compromising temporal accuracy. With space-time features, the discrimination of forest disturbances from false detections is no longer based on temporal information only, hence providing opportunity to also detect low-magnitude disturbances with high confidence. Based on the analysis for conditional variable importance, I showed that features which are computed using both spatial and temporal information were the most important predictors of forest disturbances, thus enforcing the view that forest disturbances should be treated as spatio-temporal in order to improve forest change monitoring.

In Chapter 2 – 4, forest disturbances where detected from medium resolution Landsat time series. Yet, recent studies showed that small-scale forest disturbances are often omitted when using Landsat time series. In Chapter 5, I investigated whether detection of small-scale forest disturbances can be improved by using the 10m resolution time series from recently launched Sentinel-2 sensor. I also investigated whether the spatial normalisation approach developed in Chapter 2 can be used to reduce inter-sensor differences in multi-sensor optical time series. I showed that the 10m resolution Sentinel-2 time series improves the detection of small-scale forest disturbances when compared to 30m resolution. However, the 10m resolution does not supersede the importance of frequent satellite observations when monitoring forest disturbances. I also showed that spatial normalisation approach developed in Chapter 2 can reduce inter-sensor differences in multi-sensor optical time series significantly to generate temporally consistent time series suitable for forest change detection. Spatial normalisation does not completely remove inter-sensor differences, but the differences are significantly reduced.

Monitoring of forest disturbances is increasingly done using a combination of Synthetic Aperture Radar (SAR) and optical time series. Therefore, Chapter 6 investigated whether the spatial normalisation approach developed in Chapter 2 can also reduce seasonal variations in SAR time series to facilitate the integration of SAR-optical time series for forest monitoring in dry tropical forests. This Chapter demonstrated that seasonal variations in SAR time series can also be reduced through spatial normalisation. As a result, observations from SAR and optical time series were combined to improve near real-time forest change detection in dry tropical forest. In Chapter 7, it is demonstrated that spatial normalisation has potential to also reduce inter-sensor differences in SAR-optical time series, resulting into temporally consistent SAR-optical time series.

In conclusion, this thesis developed a space-time forest monitoring framework that addresses some key challenges affecting satellite-based forest monitoring. In particular, new methods that allow for timely and accurate detection of forest disturbances using observations from multiple satellites were developed. Overall, the methods developed in this research contribute to our capacity to accurately and timely detect forest disturbances in both dry and humid forests.

FEM growth and yield data monocultures - Common beech, revised version
Goudzwaard, L. ; Jansen, J. ; Oosterbaan, A. ; Oldenburger, J.F. ; Lu, H. ; Mohren, G.M.J. - \ 2017
Growth and yield, even-aged monoculture forest - understorey - tree diameter - tree height - crown class - coordinates stem positions - age - top height - dominant height - dominant diameter - monitoring - Common beech - Fagus sylvatica
The current database is part of the FEM growth and yield database, a collection of growth and yield data from even-aged monocultures (douglas fir, common oak, poplar, Japanese Larch, Norway spruce, Scots pine, Corsican pine, Austrian pine, red oak and several other species with only a few plots, even-aged mixed species forest plots, uneven-aged natural forest, uneven-aged selection forest and roadside plantations of poplar. The FEM growth and yield data base is currently supervised by Jan den Ouden and Frits Mohren.
Monitoring integraal duurzame stallen : peildatum 1 januari 2017
Peet, G.F.V. van der; Meer, R.W. van der; Docters van Leeuwen, H. - \ 2017
Wageningen : Wageningen UR Livestock Research (Wageningen Livestock Research rapport 1027) - 19
huisvesting, dieren - stallen - monitoring - dierlijke productie - dierenwelzijn - rundvee - melkvee - pluimvee - duurzaamheid (sustainability) - animal housing - stalls - animal production - animal welfare - cattle - dairy cattle - poultry - sustainability
De overheid ambieert een integraal duurzame veehouderij in 2023. Daarom wordt jaarlijks een nieuw doel gesteld. Voor eind 2016 (peildatum 1 januari 2017) noemt het ministerie als ambitie dat minimaal 14% van de rundvee-, varkens- en pluimveestallen integraal duurzaam is. Deze studie laat zien dat op 1 januari 2017 in Nederland 13,6 % van alle stallen integraal duurzaam is.
Provinciale informatie uit landelijke natuurrapportages : provinciale informatie uit landelijke natuurrapportages voor de Europese Commissie (Habitatrichtlijn, Vogelrichtlijn, Standaard Data Formulieren) over de periode 2007-2012
Bink, R.J. ; Griffioen, A.J. ; Kleunen, A. van - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2818) - 65
habitatrichtlijn - vogelrichtlijn - habitats - evaluatie - monitoring - natura 2000 - habitats directive - birds directive - evaluation
Groundwater Atlas for pesticides in The Netherlands : user manual
Kruijne, R. ; Linden, A.M.A. van der; Roller, J.A. te; Kraalingen, D. van - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research report 2786) - 65
groundwater quality - groundwater - pesticides - monitoring - ecotoxicology - netherlands - grondwaterkwaliteit - grondwater - pesticiden - ecotoxicologie - nederland
The Groundwater Atlas contains monitoring data on the presence of active substances and related metabolites of plant protection products.
FEM growth and yield data monoculures - Scots pine (revised edition)
Lu, Huicui ; Jansen, J.J. ; Oosterbaan, A. ; Goudzwaard, L. ; Oldenburger, J.F. ; Mohren, G.M.J. ; Ouden, J. den - \ 2017
growth and yield - even-aged monoculture forest - tree diameter - tree height - crown class - coordinates stem positions - age - top height - dominant height - monitoring - Scots pine - Pinus sylvestris
The current database is part of the FEM growth and yield database, a collection of growth and yield data from even-aged monocultures (douglas fir, common oak, poplar, Japanese Larch, Norway spruce, Scots pine, Corsican pine, Austrian pine, red oak and several other species, with only a few plots, even-aged mixed species forest plots, uneven-aged natural forest, uneven-aged selection forest and roadside plantattions of poplar. The FEM growth and yield data base is currently supervised by Jan den Ouden and Frits Mohren.
Cruiserapport scheepstellingen van zeevogels op het Friese Front en op de Bruine Bank, 2016
Geelhoed, S.C.V. ; Leopold, M.F. - \ 2017
Den Helder : Wageningen Marine Research (IMARES rapport C032/17) - 36
zeevogels - noordzee - monitoring - luchtkarteringen - zeezoogdieren - biodiversiteitsbepaling - natura 2000 - sea birds - north sea - aerial surveys - marine mammals - biodiversity assessment
Het Friese Front en de Bruine Bank zijn twee nieuwe Vogelrichtlijngebieden in de Noordzee. Het Friese Front is aangewezen voor de Zeekoet. De Bruine Bank wordt waarschijnlijk aangewezen voor Zeekoet en Alk. Om te bepalen of de instandhoudingsdoelstellingen voor deze soorten worden gehaald, moeten de aantallen van deze soorten gemonitord worden. Monitoring van zeevogels in het Nederlandse deel van de Noordzee vindt plaats met behulp van MWTL-vliegtuigtellingen. Alken en Zeekoeten kunnen vanuit de lucht echter lastig van elkaar te onderscheiden zijn. Vanaf schepen is de herkenning eenvoudiger. Het onderhavige BO-project 'scheepstellingen zeevogels' dat in 2016-2018 loopt, heeft tot doel inzicht te geven in de aantallen van Alken en Zeekoeten in beide gebieden enerzijds, en anderzijds in de veranderingen in aantalsverhouding tussen beide soorten gedurende het jaar om de MWTL-vliegtuigtellingen te calibreren. In 2016 zijn drie scheerpssurveys uitgevoerd op het Friese Front (30 okt-4 nov) en op de Bruine Bank (14-17 mrt, 27 nov-1 dec). Op de Bruine Bank werden in maart 6021 individuen van 32 verschillende vogelsoorten geteld. Kleine Mantelmeeuw (n =1287), Drieteenmeeuw (n = 1101), Zeekoet (n = 1087) en Alk (n = 1081) domineerden de telling. Daarnaast werden 17 individuen verdeeld over drie soorten zeezoogdieren (Bruinvis, Gewone en Grijze Zeehond) geregistreerd. Tijdens de survey op het Friese Front in november werden 4184 individuen verdeeld over 36 verschillende vogelsoorten geteld. Zeekoet (n = 1364) en Alk (n = 628) waren de dominante soorten. Daarnaast werden 103 individuen verdeeld over drie soorten zeezoogdieren gezien. In november werden op de Bruine Bank 4356 individuen verdeeld over 24 verschillende vogelsoorten geteld. Zeekoet (n = 1326), Grote Mantelmeeuw (n = 1091) en Drieteenmeeuw (n = 878) domineerden de survey. Het aantal Alken (n = 162) was relatief laag. Daarnaast werden 50 Bruinvissen geregistreerd. Tijdens alle surveys behoorden Alken en Zeekoeten tot de talrijkste soorten. De verhouding tussen Alk en Zeekoet varieerde van 1:1 in maart op de Bruine Bank tot 1:8 op de Bruine Bank in november. Behalve van alkachtigen werden ook gegevens verzameld van potentieel kwalificerende N2000-soorten Kleine Mantelmeeuw (mrt Bruine Bank), Grote Mantelmeeuw (nov Friese Front en Bruine Bank) en Grote Jager (nov Friese Front en Bruine Bank). Dit rapport geeft een beknopt overzicht van de resultaten van de surveys in 2016. In 2018 worden de resultaten van deze en aanvullende surveys nader uitgewerkt en gepresenteerd in een eindrapportage.
The KB WOT Fisheries Programme carried out in 2016
Damme, C.J.G. van; Verver, S.W. - \ 2017
IJmuiden : Stichting Wageningen Research, Centre for Fisheries Research (CVO) (CVO report / Centre for Fisheries Research 17.007) - 63
visserijbeheer - visbestand - visserijbeleid - zeevisserij - schaal- en schelpdierenvisserij - monitoring - onderwaterakoestiek - vis - fishery management - fishery resources - fishery policy - marine fisheries - shellfish fisheries - underwater acoustics - fish
Maintaining and developing the expertises needed to execute the Dutch fisheries monitoring and advice statutory obligations is the core of the KB WOT Fisheries programme. As fisheries management and policy needs, and thus the WOT requirements, change over time, the KB WOT programme needs to be flexible to respond to these changes. The KB WOT programme seeks to be inventive and participate in the fisheries science development, while maintaining the core expertises and flexibility. The programme operates within the context of the Common Fisheries Policy (CFP), the EU Marine Strategy Framework Directive (MSFD) and the EU Maritime Policy. The KB WOT fisheries programme is established annually and positioned around a number of themes. In 2016 17 projects were originally awarded. However, one project could not meet all the original objectives and with the remaining budget a new project was started on the tool development for monitoring catches on board commercial vessels. The 18 projects within the programme were successfully completed. The focus of the programme in 2016 was on research into mapping the seafloor, development of tools and framework for monitoring catches on board commercial vessels, data storage and accessibility and method development for assessment of marine resources. As the basis of the KB WOT Fisheries is maintaining and developing key expertise for the WOT programme, a considerable part of the funds was used for projects that standardise fish ageing, fish and shellfish monitoring and development of fisheries acoustics techniques and expertise. These subjects are essential for ensuring the high quality of fish stock assessments and management. Of the 18 projects funded in 2016, six were carried out in international collaboration with other institutes in- and outside Europe. These partnerships provide a large amount of added value, since resources and expertise from these other countries contribute to the outcomes of the KB WOT Fisheries programme. Also, a large part of the KB WOT resources is specifically dedicated to international collaboration and exchange of science. This ensures that Wageningen Marine Research researchers remain at the centre of scientific developments and international fisheries research. The programme was also very productive in terms of publications, presentations and developing new methods or tools for fisheries research. Over 20 international presentations were given at meetings, workshops and symposia, and 24 international and national reports were written. 9 new methods or models were developed, 4 peer reviewed publications published and 1 scientific publication prepared
Herkomstanalyse gewasbeschermingsmiddelen in het grondwater van de Provincie Drenthe : meetperiode 2002-2007
Kruijne, Roel ; Groenwold, Jan - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2815) - 41
pesticiden - grondwater - monitoring - uitspoelen - waterverontreiniging - drenthe - nederland - pesticides - groundwater - leaching - water pollution - netherlands
In 2008 heeft WEnR-Alterra een analyse gegeven van de mogelijke herkomst van gewasbeschermingsmiddelen die in de jaren 2002, 2004, 2006 en 2007 zijn aangetroffen in het grondwater van de Provincie Drenthe. Ruim de helft van de geanalyseerde gewasbeschermingsmiddelen is niet (meer) toegelaten op de Nederlandse markt. Veel stoffen hebben een brede toepassing (gehad) in meerdere sectoren en daarnaast ook buiten de landbouw. De breedte van deze toepassingen en de wijzingen in de tijd beperken de mogelijkheid om het voorkomen van een stof in verband te brengen met een specifiek gebruik. Uit regionale berekeningen blijkt dat het grondwater in de Provincie Drenthe als geheel minder kwetsbaar is voor uitspoeling van stoffen dan het grondwater in Nederland. Uit berekeningen met lokale invoergegevens blijkt, dat de meest kwetsbare locaties voor uitspoeling van de stof bentazon zijn oververtegenwoordigd in de bemonstering.
Effecten van gebiedsgrootte op de kwaliteitsbeoordeling van Natuurgebieden : evaluatie begrenzing van beoordelingsgebieden volgens de Werkwijze Monitoring en Beoordeling van het Natuurnetwerk
Sanders, M.E. ; Schippers, P. ; Meeuwsen, H.A.M. - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2805) - 49
natuurgebieden - natuur - kwaliteit - monitoring - natura 2000 - soortenrijkdom - grootte - natural areas - nature - quality - species richness - size
De kwaliteitsbeoordeling van natuurgebieden zoals beschreven in de “Werkwijze Monitoring en Beoordeling Natuurnetwerk en Natura2000/PAS” is onder andere gebaseerd op het aantal kwalificerende soorten per beheertype en de ruimtelijke verspreiding daarvan. Deze beoordeling kan gevoelig zijn voor ruimtelijke keuzes in omvang en ligging van de beoordelingsgebieden. In dit rapport onderzoeken we de relatie tussen de grootte van de beoordelingsgebieden en de kwaliteitscriteria voor Natura 2000-gebied de Nieuwkoopse Plassen en de Veluwe. De resultaten laten zien in welke mate de beoordeling afhankelijk is van de gebiedsgrootte. Daarnaast doen we een voorstel voor een alternatieve methode voor de kwaliteitsbeoordeling die niet afhankelijk is van de gebiedsgrootte. Bij de alternatieve methode kunnen de arealen per beheertype worden opgeteld voor elke gewenst (Natura 2000-) gebied, per provincie of landelijk ongeacht de grootte en ligging van de beoordelingsgebieden.
FEM growth and yield data Monocultures - Poplar (revised version)
Mohren, G.M.J. ; Goudzwaard, L. ; Jansen, J.J. ; Schmidt, P. ; Oosterbaan, A. ; Oldenburger, J. ; Ouden, J. den - \ 2017
Growth and yield - even-aged monoculture forest - tree diameter - tree height - crown class - coordinates stem positions - age - mean height - spacing - without thinning - systematic thinning - monitoring - Poplar - Aspen - Populus species - Populus x canadensis - Populus x interamericana - Populus alba - Populus tremula
The current database is part of the FEM growth and yield database, a collection of growth and yield data from even-aged monocultures (douglas fir, common oak, poplar, Japanese Larch, Norway spruce, Scots pine, Corsican pine, Austrian pine, red oak and several other species with only a few plots, even-aged mixed species forest plots, uneven-aged natural forest, uneven-aged selection forest and roadside plantations of poplar. The FEM growth and yield data base is currently supervised by Jan den Ouden and Frits Mohren. In the FEM growth and yield data collection for even-aged monocultures in general the data of four main studies and if available some additional studies are assembled: 1. Thinning research Wageningen University initiated by Becking1 1947 – 2005. For poplar there are no recordings after 1992. In total 58 monoculture plots were selected with ini-tial number of trees varying from 86 till 2207. Different varieties and a few aspen plots were selected. The treatments consisted of without thinning (28 plots), systematic thin-ning (35 plot) and thinning from below (2 plots). Over more than four decades, this study was supervised by A. van Laar, P.G. de Vries, J.H. Hildebrand, J.J. Jansen and H.H. Bartel-ink; 2. Growth and production study by research institute Dorschkamp/IBN 1923 – 1995. The aim of this research was the construction of yield tables. See Van Soest2 for the experi-mental design. There are 188 poplar plots in this study, but only the plots with 3 or more recordings were selected, in total 77 plots with known age but unknown recording date. But beside this plots there are also 5 aspen plots of which 4 with only 2 recordings with known age and recording date; 3. Spacing trials by research institute IBN 1960 – 1995; 6 plots with known age but un-known recording date; 4. HOSP3 1984 – 2000. A collection of about 3000 permanent sample point from the Dutch National Forest Inventory. In total 42 monocultures with poplar species or varieties were selected; 5. (only for douglas fir); 6. (only for douglas fir); 7. (only for Norway spruce); 8. Nelder Spacing trial by research institute IBN 1976-19954, containing 5 experimental Nelder fields of which 3 with poplar varieties with 6 to 9 series with equal spacing per tree. One series within the Nelder field is seen as a plot, resulting in 21 plots, but hence these plots are not all mutually independent
Citizen science voor natuur in Nederland : van onschatbate waarde en onderschat belang
Breman, Bas ; Vliet, Arnold van - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2806) - 43
natuur - burgers - steden - stedelijke gebieden - biodiversiteit - monitoring - nature - citizens - towns - urban areas - biodiversity
Glass eel monitoring in the Netherlands
Griffioen, A.B. ; Vries, P. de; Twijnstra, R.H. ; Graaf, M. de - \ 2017
IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C010/17) - 41
anguilla - european eels - eels - monitoring - netherlands - palingen - nederland
In general there are three subjects described in this report: 1. Overview and brief evaluation of glass eel monitoring projects along the Dutch coast 2. Exploration of a national glass eel index based on multiple datasets along the Dutch Coast 3. Analysis of the relation between tidal currents and glass eel monitoring at Den Oever. The aim of this report is to evaluate the glass eel monitoring in the Netherlands, explore the possibility to produce a national glass eel index and to give advice on monitoring glass eel and selecting new locations.
Verdrogingsinformatie voor de Nederlandse natuur : een vergelijking tussen de actuele en gewenste grondwatersituatie
Delft, S.P.J. van; Hoogland, T. ; Meijninger, W.M.L. ; Roerink, G.J. - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2792) - 85
grondwater - natuur - verdroging (milieu) - monitoring - remote sensing - nederland - groundwater - nature - groundwater depletion - netherlands
Dit rapport beschrijft een studie die is uitgevoerd om de actuele verdrogingssituatie in kaart te brengen en een werkwijze te ontwikkelen om ook in de toekomst op een objectieve, reproduceerbare en gedragen wijze de verdrogingssituatie in kaart brengen.
Feiten en cijfers vergroening GLB
Doorn, Anne van; Smidt, Rob - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2795) - 19
landbouwbeleid - monitoring - ecologie - europa - agricultural policy - ecology - europe
The greening of the European common agricultural policy has started in 2015. This report
present facts and figures about two years of greening.
PMR Monitoring Natuurcompensatie Voordelta-bodemdieren : datarapport campagne bodemschaaf 2015-multivariate analyse 2004-2013
Craeymeersch, J.A. ; Perdon, J. ; Jol, J. ; Brummelhuis, E.B.M. ; Asch, M. van - \ 2017
IJmuiden : IMARES Wageningen UR (IMARES rapport C073.16) - 37
voordelta - bodemarthropoden - bodeminvertebraten - monitoring - gegevensanalyse - zeevisserij - soil arthropods - soil invertebrates - data analysis - marine fisheries
Het voorliggende rapport beschrijft de gewijzigde opzet van de monitoring, alsook de eerste monitoring-resultaten d.m.v. een korte beschrijving van de dataset verkregen met de bodemschaaf (omdat de monsters met de box-corer uit 2015 niet tijdig verwerkt waren om in dit rapport opgenomen te worden). Verder wordt de aanvullende studie nader besproken, qua opzet en resultaten van de multivariate analyses.
Does biomass growth increase in the largest trees? Flaws, fallacies and alternative analyses
Sheil, Douglas ; Eastaugh, Chris S. ; Vlam, Mart ; Zuidema, Pieter A. ; Groenendijk, Peter ; Sleen, Peter van der; Jay, Alex ; Vanclay, Jerome - \ 2017
Functional Ecology 31 (2017)3. - ISSN 0269-8463 - p. 568 - 581.
above-ground biomass - annual growth rings - artefacts - carbon dynamics - ecological fallacy - monitoring - ontogeny - repeated-measures - statistical methods and inference

The long-standing view that biomass growth in trees typically follows a rise-and-fall unimodal pattern has been challenged by studies concluding that biomass growth increases with size even among the largest stems in both closed forests and in open competition-free environments. We highlight challenges and pitfalls that influence such interpretations. The ability to observe and calibrate biomass change in large stems requires adequate data regarding these specific stems. Data checking and control procedures can bias estimates of biomass growth and generate false increases with stem size. It is important to distinguish aggregate and individual-level trends: a failure to do so results in flawed interpretations. Our assessment of biomass growth in 706 tropical forest stems indicates that individual biomass growth patterns often plateau for extended periods, with no significant difference in the number of stems indicating positive and negative trends in all but one of the 14 species. Nonetheless, when comparing aggregate growth during the most recent five years, 13 out of our 14 species indicate that biomass growth increases with size even among the largest sizes. Thus, individual and aggregate patterns of biomass growth with size are distinct. Claims concerning general biomass growth patterns for large trees remain unconvincing. We suggest how future studies can improve our knowledge of growth patterns in and among large trees. A lay summary is available for this article.

Fish migration river monitoring plan : Monitoring program on the effectiveness of the FMR at Kornwerderzand
Griffioen, A.B. ; Winter, H.V. - \ 2017
IJmuiden : Wageningen Marine Research (Wageningen Marine Research report C012/17A) - 50
fish migration - fishes - habitats - monitoring - afsluitdijk - wadden sea - lake ijssel - vismigratie - vissen - waddenzee - ijsselmeer
This report drafts a monitoring program aiming at determining and optimizing the effectiveness of restoring fish migration at Kornwerderzand with the ‘Fish Migration River’ (FMR.) For an adaptive management of the operation of the FMR, monitoring and evaluation are key aspects. The main research questions underlying the monitoring program will be outlined. The proposed research and monitoring approach describes which monitoring techniques can be applied, what set-up and schedule of different research components involved.
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