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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    Multistep Fractionation of Microalgal Biomolecules Using Selective Aqueous Two-Phase Systems
    Suarez Ruiz, Catalina A. ; Kwaijtaal, Jennifer ; Peinado, Oriol Cabau ; Berg, Corjan Van Den; Wijffels, Rene H. ; Eppink, Michel H.M. - \ 2020
    ACS sustainable chemistry & engineering 8 (2020)6. - ISSN 2168-0485 - p. 2441 - 2452.
    Aqueous two-phase systems - Biomolecules - Cholinium-based ionic liquids - Downstream processes - Microalgae

    We aim to develop liquid-liquid extraction processes for the fractionation of microalgal components (proteins, pigments, lipids, and carbohydrates). The partitioning behavior of microalgal pigments and proteins in aqueous two-phase systems (ATPS) composed of the polymer polypropylene glycol with molecular weight 400 (PPG 400) + various cholinium based-ionic liquids was studied. A process for fractionation of multiple components from disrupted Neochloris oleoabundans was developed and evaluated. Results show that cholinium dihydrogen phosphate (Ch DHp) allows the fractionation of pigments in the PPG 400-rich phase and proteins in the Ch DHp-rich phase with high selectivity. It was demonstrated that a multiproduct approach can fractionate free glucose, and proteins in the ionic liquid-rich phase, pigments in the polymer-rich phase, while starch and lipids are recovered at the interface.

    Predicting the spatial and temporal dynamics of species interactions in Fagus sylvatica and Pinus sylvestris forests across Europe
    Forrester, David Ian ; Ammer, Ch ; Annighöfer, Peter J. ; Avdagic, A. ; Barbeito, I. ; Bielak, Kamil ; Brazaitis, Gediminas ; Coll, L. ; Río, M. del; Drössler, L. ; Heym, Michael ; Hurt, Václav ; Löf, Magnus ; Matović, B. ; Meloni, F. ; Ouden, J. den; Pach, Maciej ; Pereira, M.G. ; Ponette, Quentin ; Pretzsch, H. ; Skrzyszewski, Jerzy ; Stojanović, D. ; Svoboda, M. ; Ruiz-Peinado, R. ; Vacchiano, G. ; Verheyen, K. ; Zlatanov, T. ; Bravo-Oviedo, A. - \ 2017
    Forest Ecology and Management 405 (2017). - ISSN 0378-1127 - p. 112 - 133.
    Biodiversity - Climate - Competition - Complementarity - Forest growth model - Mixed-species - Silviculture
    The productivity and functioning of mixed-species forests often differs from that of monocultures. However, the magnitude and direction of these differences are difficult to predict because species interactions can be modified by many potentially interacting climatic and edaphic conditions, stand structure and previous management. Process-based forest growth models could potentially be used to disentangle the effects of these factors and thereby improve our understanding of mixed forest functioning while facilitating their design and silvicultural management. However, to date, the predicted mixing effects of forest growth models have not been compared with measured mixing effects. In this study, 26 sites across Europe, each containing a mixture and monocultures of Fagus sylvatica and Pinus sylvestris, were used to calculate mixing effects on growth and yield and compare them with the mixing effects predicted by the forest growth model 3-PGmix. The climate and edaphic conditions, stand structures and ages varied greatly between sites. The model performed well when predicting the stem mass and total mass (and mixing effects on these components), with model efficiency that was usually >0.7. The model efficiency was lower for growth or smaller components such as foliage mass and root mass. The model was also used to predict how mixing effects would change along gradients in precipitation, temperature, potential available soil water, age, thinning intensity and soil fertility. The predicted patterns were consistent with measurements of mixing effects from published studies. The 3-PG model is a widely used management tool for monospecific stands and this study shows that 3-PGmix can be used to examine the dynamics of mixed-species stands and determine how they may need to be managed.
    Data from: EuMIXFOR empirical forest mensuration and ring width data from pure and mixed stands of Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.) through Europe
    Heym, Michael ; Ruíz-Peinado, Ricardo ; Río, Miren del; Bielak, Kamil ; Forrester, David Ian ; Dirnberger, Gerald ; Barbeito, I. ; Brazaitis, Gediminas ; Ruškytkė, Indré ; Coll, L. ; Ouden, J. den - \ 2017
    Technische Universitat Munchen
    Fagus sylvatica - Pinus sylvestris
    This data set provides unique empirical data from triplets of Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.) across Europe. Dendrometric variables are provided for 32 triplets, 96 plots, 7555 trees and 4695 core samples. These data contribute to our understanding of mixed stand dynamics.
    EuMIXFOR empirical forest mensuration and ring width data from pure and mixed stands of Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.) through Europe
    Heym, Michael ; Ruíz-Peinado, Ricardo ; Río, Miren del; Bielak, Kamil ; Forrester, David Ian ; Dirnberger, Gerald ; Barbeito, I. ; Brazaitis, Gediminas ; Ruškytkė, Indré ; Coll, L. ; Ouden, J. den - \ 2017
    Annals of Forest Science 74 (2017)3. - ISSN 1286-4560 - 9 p.
    This data set provides unique empirical data from triplets of Scots pine (Pinus sylvestrisL.) and European beech (Fagus sylvaticaL.) across Europe. Dendrometric variables are provided for 32 triplets, 96 plots, 7555 treesand 4695 core samples. These data contribute to our understanding of mixed stand dynamics.
    Species interactions increase the temporal stability of community productivity in Pinus sylvestris-Fagus sylvatica mixtures across Europe
    Río, Miren del; Pretzsch, Hans ; Ruíz-Peinado, Ricardo ; Ampoorter, Evy ; Annighöfer, Peter ; Barbeito, Ignacio ; Bielak, Kamil ; Brazaitis, Gediminas ; Coll, Lluís ; Drössler, Lars ; Mohren, Frits ; Ouden, Jan den; Bravo-Oviedo, Andrés - \ 2017
    Journal of Ecology 105 (2017)4. - ISSN 0022-0477 - p. 1032 - 1043.
    Asynchrony - Mixed-species forests - Niche complementarity - Organizational levels - Overyielding - Plant-plant interactions - Temporal variability

    There is increasing evidence that species diversity enhances the temporal stability (TS) of community productivity in different ecosystems, although its effect at the population and tree levels seems to be negative or neutral. Asynchrony in species responses to environmental conditions was found to be one of the main drivers of this stabilizing process. However, the effect of species mixing on the stability of productivity, and the relative importance of the associated mechanisms, remain poorly understood in forest communities. We investigated the way mixing species influenced the TS of productivity in Pinus sylvestris L. and Fagus sylvatica L. forests, and attempted to determine the main drivers among overyielding, asynchrony between species annual growth responses to environmental conditions, and temporal shifts in species interactions. We used a network of 93 experimental plots distributed across Europe to compare the TS of basal area growth over a 15-year period (1999-2013) in mixed and monospecific forest stands at different organizational levels, namely the community, population and individual tree levels. Mixed stands showed a higher TS of basal area growth than monospecific stands at the community level, but not at the population or individual tree levels. The TS at the community level was related to asynchrony between species growth in mixtures, but not to overyielding nor to asynchrony between species growth in monospecific stands. Temporal shifts in species interactions were also related to asynchrony and to the mixing effect on the TS. Synthesis. Our findings confirm that species mixing can stabilize productivity at the community level, whereas there is a neutral or negative effect on stability at the population and individual tree levels. The contrasting findings regarding the relationships between the temporal stability and asynchrony in species growth in mixed and monospecific stands suggest that the main driver in the stabilizing process may be the temporal niche complementarity between species rather than differences in species' intrinsic responses to environmental conditions.

    Data from: Species interactions increase the temporal stability of community productivity in Pinus sylvestris-Fagus sylvatica mixtures across Europe
    Río, Miren del; Pretzsch, Hans ; Ruíz-Peinado, Ricardo ; Ampoorter, Evy ; Annighöfer, Peter ; Barbeito, Ignacio ; Bielak, Kamil ; Brazaitis, Gediminas ; Coll, Lluís ; Drössler, L. ; Mohren, G.M.J. ; Ouden, J. den; Bravo-Oviedo, Andrés - \ 2016
    Wageningen University & Research
    temporal variability
    Main data are basal area increments by triplet, species composition and year, for the study period 1999-2013. Dataset includes data at community level (stand basal area increment), population level (species basal area increment in mixed and monospecific stands), and individual tree level (basal area increments by core, two cores by tree). Moreover data describing the trees used in the analysis is included.
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