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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    Potential of tree-ring analysis in a wet tropical forest: A case study on 22 commercial tree species in Central Africa
    Groenendijk, P. ; Sass, U.G.W. ; Bongers, F. ; Zuidema, P.A. - \ 2014
    Forest Ecology and Management 323 (2014). - ISSN 0378-1127 - p. 65 - 78.
    climate-growth relationships - rain-forest - pterocarpus-angolensis - age - periodicity - management - dynamics - reconstruction - precipitation - west
    Implementing sustainable forest management requires basic information on growth, ages, reproduction and survival of exploited tree species. This information is generally derived from permanent sample plots where individual trees are monitored. Accurately estimating growth rates and especially tree ages from plots is however challenging, as plots often contain only few individuals of the exploited species and monitoring periods cover only a fraction of the life-span of most trees. Alternatively, tree-ring analysis is increasingly used to obtain accurate age estimates and growth rates for tropical tree species, especially in regions with seasonally harsh conditions. However, for species from wet tropical forests (>4000 mm year-1 rainfall) few tree-ring studies exist. Under persistent high levels of rainfall, formation of distinct tree rings is uncertain due to the lack of strong seasonal variation in climate factors. Here we evaluated the potential of applying tree-ring analysis on commercial tree species in a wet tropical forest in Central-Africa. For this purpose we screened the wood anatomy of 22 tree species for the presence of tree-ring structures and, on a subset of five species, we assessed crossdating potential and evaluated the annual character of tree-ring formation by radiocarbon dating. A total of 14 of the 22 tree species showed distinct tree-ring boundaries. Radiocarbon proved annual tree-ring formation in four of the five tested species. Crossdating between trees was problematic for all species and impeded exactly dating each detected ring and building tree-ring chronologies. We also show that diameter growth rates vary strongly between and among species, with important consequences for the calculation of future timber yields. Tree-ring analysis can thus be applied on tree species growing in wet tropical forests to obtain growth rates. We argue that tree-ring analysis should actually be applied on more tree species from different areas to obtain accurate, site specific growth data. This data is urgently required to design and improve sustainable forest management practices.
    Augusta: een intrigerende virusziekte
    Derks, A.F.L.M. ; Pham, K.T.K. ; Blom-Barnhoorn, G.J. ; Bijman, V.P. ; Stijger, C.C.M.M. - \ 2007
    BloembollenVisie 2007 (2007)105. - ISSN 1571-5558 - p. 24 - 26.
    plantenvirussen - tulpen - epidemiologie - diagnostische technieken - teeltsystemen - periodiciteit - tendensen - landbouwkundig onderzoek - bestrijdingsprogramma's - bloembollen - plant viruses - tulips - epidemiology - diagnostic techniques - cropping systems - periodicity - trends - agricultural research - control programmes - ornamental bulbs
    In de periode 2001-2003 nam het Augustaziek epidemische vormen aan. In sommige tulpenpartijen werd zelfs meer dan 70% zichtbaar ziek waargenomen. Maar net zo plotseling als de virusepidemie opkwam, zo snel verdween deze weer na 2003. Terugkijkend in de geschiedenis van de tulpenteelt lijkt er een periodiciteit te zijn in de uitbraak van deze ziekte en wel met een interval van 8 tot 10 jaar. In 2002 werd er opnieuw onderzoek gestart bij PPO Bloembollen naar deze virusziekte. In dit artikel een overzicht van deze en eerdere onderzoeken
    Combining dendrochronology and matrix modelling in demographic studies: An evaluation for Juniperus procera in Ethiopia
    Couralet, C. ; Sass, U.G.W. ; Sterck, F.J. ; Zuidema, P.A. - \ 2005
    Forest Ecology and Management 216 (2005)1-3. - ISSN 0378-1127 - p. 317 - 330.
    tropical deciduous forest - tree-ring chronologies - pterocarpus-angolensis - growth rings - rain-forest - dynamics - periodicity - populations - management - community
    Tree demography was analysed by applying dendrochronological techniques and matrix modelling on a static data set of Juniperus procera populations of Ethiopian dry highland forests. Six permanent sample plots were established for an inventory of diameters and 11 stem discs were collected for dendrochronological analysis. J. procera was proved to form concentric annual growth layers in response to seasonal changes in precipitation. Uncertainty analysis for the matrix model revealed its robustness to variations in parameter estimates. The major outcome was that the population growth rate is very sensitive to changes in growth or survival of trees between 10 and 40 cm DBH. For forest management this implies that these intermediate sized individuals should be protected and less used for harvest. This study documents that interesting results can be achieved using a relatively simple approach that can easily be adopted for other areas or with other species. However, the matrix modelling requires more precise knowledge about the trees¿ fecundity and survival (especially for the smaller individuals) and more consistent inventories. For tree-ring analysis it can be concluded that J. procera from Ethiopia has potential to investigate the relationship between tree growth and precipitation with a high temporal resolution
    A-locatie bossen in Drenthe : kenschets, beoordeling en adviezen met betrekking tot behoud en ontwikkeling van relicten van inheemse bosgemeenschappen in de provincie Drenthe
    Ouden, J.B. den - \ 1998
    Wageningen : IBN-DLO (IBN - rapport 300) - 101
    bosbouw - bossen - geschiedenis - plantensuccessie - periodiciteit - vegetatie - analyse - ecologie - bosecologie - flora - bescherming - conservering - nederland - natuurlijke opstanden - drenthe - forestry - forests - history - plant succession - periodicity - vegetation - analysis - ecology - forest ecology - flora - protection - conservation - netherlands - natural stands - drenthe
    A-locatie bossen in Noord-Brabant : kenschets, beoordeling en adviezen met betrekking tot behoud en ontwikkeling van relicten van inheemse bosgemeenschappen in de provincie Noord-Brabant
    Ouden, J.B. den; Broekmeyer, M.E.A. - \ 1998
    Wageningen : IBN-DLO (IBN - rapport 387) - 114
    bosbouw - bossen - geschiedenis - plantensuccessie - periodiciteit - vegetatie - analyse - ecologie - bosecologie - flora - bescherming - conservering - nederland - natuurlijke opstanden - noord-brabant - forestry - forests - history - plant succession - periodicity - vegetation - analysis - ecology - forest ecology - flora - protection - conservation - netherlands - natural stands - noord-brabant
    A-locatiebossen in Zuid-Holland; kenschets, beoordeling en adviezen met betrekking tot behoud en ontwikkeling van relicten van inheemse bosgemeenschappen in de provincie Zuid-Holland.
    Ouden, J.B. den - \ 1998
    Wageningen : IBN-DLO (IBN-rapport 377) - 120
    bosbouw - bossen - geschiedenis - plantensuccessie - periodiciteit - vegetatie - analyse - ecologie - bosecologie - flora - bescherming - conservering - nederland - natuurlijke opstanden - zuid-holland - forestry - forests - history - plant succession - periodicity - vegetation - analysis - ecology - forest ecology - flora - protection - conservation - netherlands - natural stands - zuid-holland
    A-locatie bossen in Zeeland
    Dort, K.W. van; Ouden, J.B. den - \ 1998
    Wageningen : IBN-DLO (IBN-rapport 386) - 39
    bosbouw - bossen - geschiedenis - plantensuccessie - periodiciteit - vegetatie - analyse - ecologie - bosecologie - flora - bescherming - conservering - nederland - natuurlijke opstanden - zeeland - forestry - forests - history - plant succession - periodicity - vegetation - analysis - ecology - forest ecology - flora - protection - conservation - netherlands - natural stands - zeeland
    A-locatie bossen in Flevoland
    Dort, K.W. van; Ouden, J.B. den - \ 1998
    Wageningen : IBN-DLO (IBN-rapport 383) - 32
    bosbouw - bossen - geschiedenis - plantensuccessie - periodiciteit - vegetatie - analyse - ecologie - bosecologie - flora - bescherming - conservering - nederland - natuurlijke opstanden - flevoland - forestry - forests - history - plant succession - periodicity - vegetation - analysis - ecology - forest ecology - flora - protection - conservation - netherlands - natural stands - flevoland
    A-locatie bossen in Friesland
    Dort, K.W. van; Ouden, J.B. den - \ 1998
    Wageningen : IBN-DLO (IBN-rapport 382) - 66
    bosbouw - bosecologie - bossen - geschiedenis - analyse - ecologie - conservering - flora - vegetatie - plantensuccessie - periodiciteit - bescherming - nederland - natuurlijke opstanden - friesland - forestry - forest ecology - forests - history - analysis - ecology - conservation - flora - vegetation - plant succession - periodicity - protection - netherlands - natural stands - friesland
    Simulation of growth and competition in mixed stands of Douglas-fir and beech
    Bartelink, H.H. - \ 1998
    Agricultural University. Promotor(en): J. Goudriaan; A. van Maaren; G.M.J. Mohren. - S.l. : Bartelink - ISBN 9789054858348 - 222
    bosbouw - gemengde bossen - groeimodellen - houtaanwas - voorspellen - plantensuccessie - periodiciteit - vegetatie - bomen - computersimulatie - simulatie - simulatiemodellen - pseudotsuga menziesii - fagus sylvatica - gemengde opstanden - forestry - mixed forests - growth models - increment - forecasting - plant succession - periodicity - vegetation - trees - computer simulation - simulation - simulation models - pseudotsuga menziesii - fagus sylvatica - mixed stands

    For a long time, the emphasis in silviculture in Western Europe was solely on even-aged, monospecific stands; many empirical stand-level growth models were developed and successfully used for managing such stands. In contrast, no generally accepted growth and yield approach has emerged so far for mixed forests. Moreover, the inexhaustible number of species combinations, management regimes, and site-dependent interactions make an empirical approach less suitable.

    In the present study, a mechanistic model was developed that simulates growth and yield in mixed forest stands. Douglas-fir ( Pseudotsuga menziesii (Mirb.) Franco) and beech ( Fagus sylvatica L.) were used in this research. In the model, tree growth is dependent on radiation availability. Stand development is largely driven by competition for radiation. A spatial module was developed to investigate the effects of tree and stand characteristics on radiation interception. The study showed that in heterogeneous stands a spatial approach is needed to account for competition between trees.

    Growth of the trees was estimated using the radiation-use efficiency concept (RUE). Results revealed that detailed process models can be used to estimate RUE and that it is a suitable tool for (mixed) forest modelling.

    To describe the distribution of the dry matter growth, a separate module was developed using functional relationships between tree components: the dry matter distribution is driven by the aim to maintain structural balances within the tree. The study showed that this approach is able to reproduce the development of an individual forest tree. The approach was thus considered very suitable for modelling the effects of between-tree competition for resources on growth and development of mixed forest stands.

    The overall growth model, COMMIX, was applied to investigate the effects of stand composition on mixed stand productivity, using a replacement series. Analysis showed that the productivity of mixed forest stands is generally somewhere in between the yield levels of the monocultures of the less productive and the most productive species. It will only be possible to achieve higher yields in mixed stands if these stands have a relatively small proportion of the sub-dominant species. In the case of Douglas-fir and beech, the maintenance of a mixed stand appeared to conflict with the maximization of the wood production.

    Insufficient data are available on mixed stands to directly support decision taking in forest management. New research tools capable of providing forest managers with information on possible management scenarios and on the consequences of certain management regimes are therefore urgently required. The present modelling approach is part of an ongoing development of models for mixed stands. The infinite variety of possible species mixtures coupled with the range of environmental conditions under which mixtures might be grown, necessitates a mechanistic approach and emphasises the potential use of such models.

    Bosdynamiek in het Vijlnerbos
    Bouwma, I.M. ; Clerkx, A.P.P.M. ; Hees, A.F.M. van - \ 1997
    Wageningen : IBN-DLO (IBN - rapport 327, 353) - 37
    bosbouw - bossen - natuurreservaten - natuurbescherming - statistiek - vegetatie - opstandsdichtheid - plantensuccessie - periodiciteit - nederland - zuid-limburg - forestry - forests - nature reserves - nature conservation - statistics - vegetation - stand density - plant succession - periodicity - netherlands - zuid-limburg
    Hoefdieren in het boslandschap
    Wieren, S.E. van; Groot Bruinderink, G.W.T.A. ; Jorritsma, I.T.M. ; Kuiters, A.T. - \ 1997
    Leiden : Backhuys - ISBN 9789073348745 - 224
    hoefdieren - begrazing - bedrijfsvoering - natuurbescherming - bossen - vegetatie - bosbouw - plantensuccessie - periodiciteit - bosweiden - bosschade - bosplagen - dieren - nederland - ungulates - grazing - management - nature conservation - forests - vegetation - forestry - plant succession - periodicity - woodland grasslands - forest damage - forest pests - animals - netherlands
    Grote grazers en het effect op vegetatie en bodem. Resultaten van het nationaal begrazingsonderzoek
    A-locatie bossen in Overijssel: kenschets, beoordeling en adviezen met betrekking tot behoud en ontwikkeling van relicten van inheemse bosgemeenschappen in de provincie Overijssel
    Ouden, J.B. den; Broekmeyer, M.E.A. ; Koop, H.G.J.M. - \ 1997
    Wageningen : DLO-Instituut voor Bos- en Natuuronderzoek (IBN-rapport 272) - 177
    bosbouw - bossen - geschiedenis - plantensuccessie - periodiciteit - vegetatie - analyse - ecologie - bosecologie - flora - bescherming - conservering - nederland - natuurlijke opstanden - overijssel - forestry - forests - history - plant succession - periodicity - vegetation - analysis - ecology - forest ecology - flora - protection - conservation - netherlands - natural stands - overijssel
    Trends in het ecologisch functioneren van bossen
    Bouwma, I.M. ; Olsthoorn, A.F.M. - \ 1997
    Wageningen : IBN-DLO - 77
    bosbouw - plantensuccessie - periodiciteit - vegetatie - houtteelt - bosbouwkundige handelingen - groei - milieufactoren - bossen - milieubescherming - conservering - plantenecologie - nederland - forestry - plant succession - periodicity - vegetation - silviculture - forestry practices - growth - environmental factors - forests - environmental protection - conservation - plant ecology - netherlands
    Vegetatieverandering in drie Twentse bossen ('t Hanhof, Hoge Venterink, Smoddebos) 1951-1995
    Dirkse, G.M. - \ 1997
    Wageningen : IBN-DLO - 33
    bosbouw - plantensuccessie - periodiciteit - vegetatie - nederland - overijssel - twente - forestry - plant succession - periodicity - vegetation - netherlands - overijssel - twente
    Bosdynamiek in Noordhout; tien jaar monitoring van een wintereiken-beukenbos
    Clerkx, A.P.P.M. ; Broekmeyer, M.E.A. - \ 1997
    Wageningen : IBN-DLO - 95
    bosbouw - plantensuccessie - periodiciteit - vegetatie - synecologie - meting - bomen - quercus petraea - fagus sylvatica - nederland - utrecht - forestry - plant succession - periodicity - vegetation - synecology - measurement - trees - quercus petraea - fagus sylvatica - netherlands - utrecht
    Bosdynamiek in bosreservaat Galgenberg
    Clerkx, A.P.P.M. ; Broekmeyer, M.E.A. ; Szabo, P.J. ; Hees, A.F.M. van; Os, L.J. van; Koop, H.G.J.M. - \ 1996
    Wageningen : IBN-DLO - 137
    bosbouw - bossen - natuurreservaten - natuurbescherming - bedrijfsvoering - wildernis - woeste grond - plantensuccessie - periodiciteit - vegetatie - statistiek - opstandsdichtheid - nederland - utrecht - forestry - forests - nature reserves - nature conservation - management - wilderness - waste land - plant succession - periodicity - vegetation - statistics - stand density - netherlands - utrecht
    A-locatie bossen in Limburg; kenschets, beoordeling en adviezen met betrekking tot behoud en ontwikkeling van bosrelicten in de provincie Limburg
    Ouden, J.B. den - \ 1995
    Unknown Publisher (IBN-rapport 136) - 181
    analyse - conservering - ecologie - flora - bosecologie - bosbouw - bossen - geschiedenis - periodiciteit - plantensuccessie - bescherming - vegetatie - nederland - natuurlijke opstanden - limburg - analysis - conservation - ecology - flora - forest ecology - forestry - forests - history - periodicity - plant succession - protection - vegetation - netherlands - natural stands - limburg
    Bosdynamiek in de Otterskooi; tien jaar monitoring van een elzenbroekbos
    Clerkx, A.P.P.M. ; Broekmeyer, M.E.A. ; Koop, H.G.J.M. - \ 1995
    Wageningen : IBN-DLO - 105
    bosbouw - cartografie - meting - periodiciteit - plantensuccessie - polders - synecologie - vegetatie - wetlands - nederland - overijssel - forestry - mapping - measurement - periodicity - plant succession - polders - synecology - vegetation - wetlands - netherlands - overijssel
    Veranderingen in de ondergroei van het Nederlandse dennenbos over de periode 1985 - 1993
    Dobben, H.F. van; Vocks, M.J.M.R. ; Jansen, E. - \ 1994
    Wageningen : IBN (IBN - rapport 085) - 37
    bosbouw - statistiek - vegetatie - opstandsdichtheid - lagenstructuur - biomassa - plantensuccessie - periodiciteit - bomen - nederland - pinus sylvestris - forestry - statistics - vegetation - stand density - layer structure - biomass - plant succession - periodicity - trees - netherlands - pinus sylvestris
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