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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    Monodominance of Parashorea chinensis on fertile soils in a Chinese tropical rain forest
    Velden, N. van der; Slik, J.W.F. ; Hu, Y.H. ; Lan, Q. ; Lin, L. ; Deng, X.B. ; Poorter, L. - \ 2014
    Journal of Tropical Ecology 30 (2014)4. - ISSN 0266-4674 - p. 311 - 322.
    tree species composition - size distributions - diversity - mexico - xishuangbanna - phosphorus - mechanisms - vegetation - responses - guyana
    Monodominance in the tropics is often seen as an unusual phenomenon due to the normally high diversity in tropical rain forests. Here we studied Parashorea chinensis H. Wang (Dipterocarpaceae) in a seasonal tropical forest in south-west China, to elucidate the mechanisms behind its monodominance. Twenty-eight 20 × 20-m plots were established in monodominant and mixed forest in Xishuangbanna, Yunnan province. All individuals =1 cm stem diameter and 16 soil variables were measured. Parashorea chinensis forest had a significantly higher mean tree dbh compared with mixed forest. Diversity did not differ significantly between the two forest types. However, within monodominant patches, all diversity indices decreased with an increase in P. chinensis dominance. Floristic composition of P. chinensis forest did differ significantly from the mixed forest. These differences were associated with more fertile soils (significantly higher pH, Mn, K and lower carbon pools and C:N ratio) in the P. chinensis forest than the mixed forest. In contrast to current paradigms, this monodominant species is not associated with infertile, but with fertile soils. Parashorea chinensis seems to be especially associated with high manganese concentrations which it can tolerate, and with edaphic conditions (water, K) that allow this tall and exposed emergent species to maintain its water balance. This is in contrast with most previous studies on monodominance in the tropics that found either no effect of soil properties, or predict associations with nutrient-poor soils.
    A taxonomic survey of Guatteria section Mecocarpus including the genera Guatteriopsis and Guatteriella p.p. (Annonaceae).
    Maas, P.J.M. ; Westra, L.I.T. - \ 2011
    Blumea 56 (2011)2. - ISSN 0006-5196 - p. 113 - 145.
    french-guiana - america - guyana - trees - genus
    This paper deals with a group of species of the Neotropical genus Guatteria (Annonaceae) which are characterized by leaves with tiny warts (verruculae) on both surfaces and by elongate and short-stipitate monocarps (i.e., the length of the monocarp body surpassing the length of the stipe). These species were placed by Fries in Guatteria sect. Mecocarpus (Fries 1939) (the name derives from Ancient Greek µ¿¿¿¿ = Poppy and ¿a¿p¿¿ = fruit: fruit resembling that of Papaver species). All occur in South America, none having been found elsewhere so far. Although there is much doubt nowadays about the taxonomic significance of Fries's sections, we maintain sect. Mecocarpus at present for convenience's sake. Additionally, the former genus Guatteriopsis, united with Guatteria a short time ago (Erkens & Maas 2008b), is now also included in sect. Mecocarpus. The same applies to one of the two species attributed to Guatteriella (also merged with Guatteria by Erkens & Maas 2008b), namely Guatteriella tomentosa R.E.Fr. (not Guatteria tomentosa Rusby) which is put into synonymy with Guatteria trichocarpa Erkens & Maas. One new species is described, namely Guatteria griseifolia Maas & Westra. The two species complexes of G. guianensis and G. decurrens are now treated each as a single polymorphic species. The present study falls within the framework of a planned monograph of the whole genus Guatteria.
    New species of Annonaceae from the Neotropics and miscellaneaous notes
    Maas, P.J.M. ; Westra, L.I.T. - \ 2010
    Blumea 55 (2010)3. - ISSN 0006-5196 - p. 259 - 275.
    guatteria annonaceae - french-guiana - pseudoxandra annonaceae - genus - america - guyana - trees
    In this paper six new Neotropical species in four genera are described, viz. Annona oxapampae, Duguetia vaupesana, Guatteria castilloi, G. pachyphylla, G. sanctae-crucis and Pseudoxandra xylopiifolia. Furthermore additional data on four poorly known species of Guatteria (G. denudata, G. glauca, G. modesta and G. terminalis) are added.
    Two new species of Guatteria (Annonaceae) from the Atlantic Forest of Brazil.
    Lobao, A.Q. ; Maas, P.J.M. ; Mello-Silva, R. de - \ 2010
    Blumea 55 (2010)2. - ISSN 0006-5196 - p. 120 - 122.
    french-guiana - america - guyana - trees - genus
    Guatteria emarginata and G. stenocarpa, two new species from the Atlantic Forest in Espírito Santo and Bahia, Brazil, are presented here. Guatteria emarginata is characterized by narrowly obovate, verruculose leaves, densely covered with cinereous hairs on the lower side and an emarginate apex. Guatteria stenocarpa is remarkable among the Atlantic Forest species of the genus for its narrowly ellipsoid to cylindric monocarps of 22-25 mm long.
    Amazonia revealed: a perspective from the Amazon
    Peña-Claros, M. ; Villegas, Z. ; Poorter, L. - \ 2007
    Frontiers in Ecology and the Environment 5 (2007)5. - ISSN 1540-9295 - p. 237 - 237.
    Soils of the rainforest in Central Guyana
    Kekem, A.J. van; Pulles, J.H.M. ; Khan, Z. - \ 1996
    Wageningen : Tropenbos (Tropenbos - Guyana series 2) - ISBN 9789039311592 - 160
    bodemkarteringen - kaarten - bosbouw - landgebruik - planning - landevaluatie - regionale planning - guyana - soil surveys - maps - forestry - land use - planning - land evaluation - regional planning - guyana
    A soil survey was carried out in the Mabura-Kurupukari area (Guyana) to provide basic data for decisions on sustained use of the forest. Soils of the hills and dissected erosional plains have been formed in residual rock and are shallow to deep, stonyand clayey. The dissected sedimentary plains consist of deep, excessively drained, white sands and deep, well-drained, brown loams and clays. Soil weathering and translocation of weathering products have determined the clay content of the soils of the sedimentary plains. All soils are strongly acid and nutrient-poor. Human interference in the forest ecosystem will affect the soil quality.
    Radar remote sensing of tropical rain forests: the AIRSAR-93 campaign in Guyana and Colombia.
    Hoekman, D.H. ; Sanden, J.J. van der; Bijker, W. - \ 1996
    Delft : BCRS - ISBN 9789054111870 - 59
    bosbouw - remote sensing - luchtkarteringen - tropische regenbossen - vegetatie - toepassingen - guyana - colombia - forestry - remote sensing - aerial surveys - tropical rain forests - vegetation - applications - guyana - colombia
    Radar remote sensing of tropical rain forests: ERS-1 studies in Guyana and Colombia. Final Report.
    Sanden, J.J. van der; Hoekman, D.H. ; Bijker, W. - \ 1996
    Delft : BCRS - ISBN 9789054111962 - 43
    bosbouw - remote sensing - luchtkarteringen - tropische regenbossen - vegetatie - toepassingen - guyana - colombia - forestry - remote sensing - aerial surveys - tropical rain forests - vegetation - applications - guyana - colombia
    Radar remote sensing of tropical rain forests: the SAREX-92 campaign in Guyana and Colombia.
    Hoekman, D.H. ; Sanden, J.J. van der; Bijker, W. - \ 1994
    Delft : BCRS - ISBN 9789054111160 - 68
    bosbouw - remote sensing - luchtkarteringen - toepassingen - tropische regenbossen - vegetatie - guyana - colombia - forestry - remote sensing - aerial surveys - applications - tropical rain forests - vegetation - guyana - colombia
    Fruits of the Guianan Flora
    Roosmalen, M.G.M. van - \ 1985
    Utrecht University, Dept. of Plant Taxonomy : Utrecht - ISBN 9789090009889 - 483
    flora - bosbouw - vruchten - guyana - plantengeografie - plantenmorfologie - zaden - flora - forestry - fruits - guyana - phytogeography - plant morphology - seeds
    Variability in the occurrence of the sugar cane froghopper, Aeneolamia flavilatera (Homoptera: Cercopidae), on sugar estates in Guyana and Surinam
    Wiedijk, F. - \ 1982
    Landbouwhogeschool Wageningen. Promotor(en): J. de Wilde, co-promotor(en): J.B.M. van Dinther. - Wageningen : Wiedijk - 60
    insecten - plantenplagen - saccharum officinarum - suikerriet - cercopoidea - dieren - populatiedichtheid - populatie-ecologie - mortaliteit - populatiegroei - guyana - suriname - insects - plant pests - saccharum officinarum - sugarcane - cercopoidea - animals - population density - population ecology - mortality - population growth - guyana - suriname

    Significant numbers of the sugar cane froghopper, Aeneolamia flavilatera, are generally not found to be present on sugar cane during the periodically occurring prolonged dry periods. This is primarily attributable to drought induced quiescence in the froghopper eggs, which delays the appearence of the next generation of active froghopper stages. It appears that the density of the post-drought populations of active froghopper stages is primarily dependent on the density of the pre-drought, quiescence sensitive egg populations. Effective froghopper control depends on the timely control of the first generation of post-drought active stages, because of the potentially rapid build-up of the froghopper infestation during prolonged rainy periods through a combination of relatively high reproduction capacity and wind accelerated adult dispersal. Control of the first generation of post-drought populations of the active stages should be based on a field by field prognosis through the interpretation of regularly updated field records of the approximate density of the active froghopper stages. The spatial distribution of froghopper infestations within one sugar estate can be influenced markedly by 'block-wise' harvesting. This in turn allows the potential effectiveness and efficiency of froghopper control measures to be greatly enhanced.

    Bibliography of the vegetation of Guiana, Surinam and French Guiana (S.A.)
    Boerboom, J.H.A. - \ 1970
    Wageningen : [s.n.] (Celos bulletins 1970, no. 11) - 4
    bibliografieën - plantkunde - guyana - bibliographies - botany - guyana
    A pedo-geomorphological classification and map of the Holocene sediments in the coastal plain of the three Guianas
    Brinkman, R. ; Pons, L.J. - \ 1968
    Wageningen : Stichting voor Bodemkartering Wageningen (Soil survey papers / Soil Survey Institute 4) - 40
    geomorfologie - guyana - gesteenten - sedimentmaterialen - bodemclassificatie - bodemtaxonomie - bodemtypen - suriname - holoceen - postglaciale perioden - geomorphology - guyana - rocks - sedimentary materials - soil classification - soil taxonomy - soil types - suriname - holocene - postglacial periods
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