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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Use of dynamic soil–vegetation models to assess impacts of nitrogen deposition on plant species composition: an overview
Vries, W. de; Wamelink, G.W.W. ; Dobben, H.F. van; Kros, J. ; Reinds, G.J. ; Mol-Dijkstra, J.P. ; Smart, S.M. ; Evans, D.R. ; Rowe, E. ; Belyazid, S. ; Sverdrup, H. ; Hinsberg, A. van; Posch, M. ; Hettelingh, J.P. ; Spranger, T. ; Bobbink, R. - \ 2010
Ecological Applications 20 (2010)1. - ISSN 1051-0761 - p. 60 - 79.
bodemchemie - emissie - stikstof - modellen - bodem-plant relaties - soil chemistry - emission - nitrogen - models - soil plant relationships - ellenberg indicator values - need phytosociological classes - field-measurements - acid deposition - critical loads - netherlands - resilience - prediction - regression - reduction
Field observations and experimental data of effects of nitrogen (N) deposition on plant species diversity have been used to derive empirical critical N loads for various ecosystems. The great advantage of such an approach is the inclusion of field evidence, but there are also restrictions, such as the absence of explicit criteria regarding significant effects on the vegetation, and the impossibility to predict future impacts when N deposition changes. Model approaches can account for this. In this paper, we review the possibilities of static and dynamic multispecies models in combination with dynamic soil–vegetation models to (1) predict plant species composition as a function of atmospheric N deposition and (2) calculate critical N loads in relation to a prescribed protection level of the species composition. The similarities between the models are presented, but also several important differences, including the use of different indicators for N and acidity and the prediction of individual plant species vs. plant communities. A summary of the strengths and weaknesses of the various models, including their validation status, is given. Furthermore, examples are given of critical load calculations with the model chains and their comparison with empirical critical N loads. We show that linked biogeochemistry–biodiversity models for N have potential for applications to support European policy to reduce N input, but the definition of damage thresholds for terrestrial biodiversity represents a major challenge. There is also a clear need for further testing and validation of the models against long-term monitoring or long-term experimental data sets and against large-scale survey data. This requires a focused data collection in Europe, combing vegetation descriptions with variables affecting the species diversity, such as soil acidity, nutrient status and water availability. Finally, there is a need for adaptation and upscaling of the models beyond the regions for which dose–response relationships have been parameterized, to make them generally applicable
An expert system for identifying the habitats of Annex I of the Habitats Directive, 70 years of Landscape Ecology in Europe
Bunce, R.G.H. ; Evans, D.R. ; Mücher, C.A. ; Hennekens, S.M. - \ 2009
A comparison of the digestibility of a range of lupin and soybean protein products when fed to either Atlantic salmon (Salmo salar) or rainbow trout (Oncorhynchus mykiss)
Glencross, B.D. ; Carter, C.G. ; Duijster, N. ; Evans, D.R. ; Dods, K. ; McCafferty, P. ; Hawkins, W.E. ; Maas, R. van der; Sipsas, S. - \ 2004
Aquaculture 237 (2004)39539. - ISSN 0044-8486 - p. 333 - 346.
fish-meal - feed ingredients - kernel meals - fed diets - replacement - growth - oligosaccharides - angustifolius - elements - energy
This study compares the digestibility of a series of lupin and soybean protein products when fed to either rainbow trout or Atlantic salmon. The test ingredients in the study, from one of two key grain resources (lupins: Lupinus angustifolius and soybeans), represented various levels of processing of each grain in order to increase the protein content of the meals. A reference ingredient of enzymatically hydrolyzed casein (EHC) was also included in the study. The rainbow trout (266±18 g) were housed in freshwater tanks (250 l, salinity
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