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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    The role of vegetation in Building with Nature pilot sandy foreshore Houtribdijk
    Lange, H.J. de; Huiskes, H.P.J. ; Groot, G.A. de; Penning, E. ; Steetzel, H.J. ; Fiselier, J. ; Ouwerkerk, S. ; Thiel de Vries, J.S.M. van - \ 2016
    - 1 p.
    The natural situation of foreshores in shallow lakes with a gradual slope, sometimes a sandy beach and a well-developed riparian zone (submerged macrophytes and helophytes) is quite rare in the Netherlands. Still, the various ecosystem services that natural foreshores offer, e.g. attenuation of incoming wave action and habitat for fauna, gives inspiration to innovative solutions. Especially the wave attenuation service has received attention as a viable alternative to conventional dike reinforcement. To increase our understanding of a constructed foreshore, we applied 70.000 m3 of sand along a 400 m long stretch of the Houtribdijk (Markermeer) during the summer of 2014, creating a foreshore with a gradual slope (1:30). The pilot was divided into four sections, two of which have an additional top layer of a sand-clay mixture to promote vegetation development. Each section was partially planted with selected wetland species, related to the possibilities and limitations to construct the desired abiotic environment. The vegetation is expected to deliver two ecosystem services related to flood protection: roots will prevent erosion of the sand, and aboveground biomass will dissipate wave energy. One of the chosen species is Common reed (Phragmites australis). To further enhance our understanding of the success of reed, we study the genetic diversity of Common reed in the Netherlands to identify if specific genotypes or phenotypes can be associated with its success at a given habitat. We present the first results of this genetic analysis and give advice on how this species can be promoted in newly constructed foreshores.
    Establishing vegetated foreshores to increase dike safety along lake shores
    Penning, E. ; Steetzel, H.J. ; Santen, R. van; Lange, H.J. de; Ouwerkerk, S. ; Vuik, V. ; Fiselier, J. ; Thiel de Vries, J.S.M. van - \ 2016
    - p. 6 - 6.
    Vegetated foreshores in front of existing dikes can contribute to the overall reduction of wave loads on the dike. In order to test this concept in large shallow lakes a field pilot was constructed along the Houtribdijk in Lake Markermeer (the Netherlands) in 2014 to gain experience with construction, stability, maintenance and governance aspects. A large scale monitoring programme was set up to follow the hydrodynamic forcing, morphological changes and vegetation development on the pilot. The pilot is located on an exposed south-westerly direction, and experiences substantial wave impact. As a result the desired vegetation on the land-water interface has not been able to establish, but a rather dynamic sandy beach is currently the main feature along the waterline of the site. Higher up the slope planted reeds, and a mixture of willows has well established itself in the first growing season. The exposed position of the location makes that hardly any natural pioneer vegetation has settled, only in small sheltered areas some annuals were able to germinate and maintain themselves.
    Natural foreshores as an alternative to traditional dike re-enforcements: a field pilot in the large shallow lake Markermeer, The Netherlands
    Penning, W.E. ; Steetzel, H.J. ; Santen, R. van; Fiselier, J. ; Lange, H.J. de; Vuik, V. ; Ouwerkerk, S. ; Thiel de Vries, J.S.M. van - \ 2015
    In: E-proceedings of the 36th IAHR World Congress. - 2015 : - 4
    nature development - flood control - dykes - riparian vegetation - coasts - hydrodynamics - natuurontwikkeling - hoogwaterbeheersing - dijken - oevervegetatie - kusten - hydrodynamica
    Natural foreshores are shallow zones and beaches with a gradual slope and a (near-)natural vegetation that can be used
    as an additional protection against flooding by reducing the wave attack on existing dikes, or can even completely
    replace an existing dike system. In order to test the applicability of this concept a 500 m long pilot section of a sandy
    foreshore was constructed along an already existing dike in the large shallow lake Markermeer, the Netherlands. The
    pilot was equipped with permanent monitoring equipment for hydrodynamics and meteorological conditions and monthly
    surveys of the morphology of the pilot section. These measurements will be carried out for the coming four years. This
    paper presents the first results after the construction and the first winter season with the pilot in place.
    CAMASE. Register of Agro-ecosystems Models, Version 11. CAMASE; a Concerted Action for the development and testing of quantitative methods for research on agricultural systems and the environment, March 1996
    Plentinger, M.C. ; Penning de Vries, F.W.T. - \ 2005
    Wageningen : DLO-Research Institute for Agrobiology and Soil Fertility - 420
    ecologie - gewassen - landbouw - fenologie - acclimatisatie - inventarisaties - controlelijsten - agro-ecosystemen - ecology - crops - agriculture - phenology - acclimatization - inventories - checklists - agroecosystems
    From 1995 until July 1st, 2005, the CAMASE Register of Agro-ecosystems Models was available as a searchable database on the Internet, hosted by Wageningen UR Library. This electronic-only edition of the Register contains the data present in the Register after the final update in June 1996.
    De Wit C.T.
    Penning de Vries, F.W.T. ; Keulen, H. van - \ 2002
    In: Encyclopedia of global environmental change. Vol. 2. The earth systems: biological and ecological dimensions of global environmental change / Mooney, H.A., Canadell, J.G., - p. 259 - 260.
    The Earth system : biological and ecological dimensions of global environmental change
    Penning de Vries, F.W.T. ; Keulen, H. van - \ 2002
    In: Encyclopedia of Global Environmental Change / Munn, T., - p. 259 - 260.
    The economic appraisal of soil and water conservation measures
    Graaff, J. de - \ 2001
    In: Response to land Degradation / Bridges, E.M., Hannan, I.D., Scherr, S.J., Oldeman, L.R., Penning de Vries, F.W.T., Sombatpanit, S., - p. 274 - 283.
    Data use and Bayesian methods for model calibration
    Jansen, M.J.W. - \ 1999
    In: Data and models in action / Stein, A., Penning de Vries, F.W.T., Dordrecht : Kluwer - p. 69 - 80.
    General introduction
    Stein, A. ; Penning, F.W.T. de - \ 1999
    In: Data and models in action. Methodological issues in production ecology / Stein, A., Penning de Vries, F.W.T., - p. 13 - 16.
    Multi-scale approaches for geodata
    Molenaar, M. - \ 1999
    In: Data and models in action : methodological issues in production ecology / Stein, A., Penning de Vries, F.W.T., Dordrecht : Kluwer Academic Publishers - p. 119 - 141.
    Food supply capacity study at global scale
    Groot, J.J.R. ; Penning de Vries, F.W.T. ; Uithol, P.W.J. - \ 1998
    In: Proceedings ISSS workshop "Soil and water quality at different scales", 7-9 August 1996, Wageningen. Nutrient Cycling in Agroecosystems 50 - p. 181 - 189.
    Application of simulation and systems analysis in rice-cropping optimization.
    Bouman, B.A.M. ; Penning de Vries, F.W.T. ; Riethoven, J.J.M. ; Kropff, M.J. ; Wopereis, M.C.S. - \ 1998
    In: Red and Lateritic Soils. Vol. 1. Managing red and lateritic soils for sustainable agriculture / Sehgal, J., Blum, W.E., Gajbhiye, K.S., - p. 163 - 176.
    Et demain l'agriculture? : options techniques et mesures politiques pour un developpement agricole durable en Afrique subsaharienne : cas du Cercle de Koutiala en zone sud du Mali
    Sissoko, K. - \ 1998
    Agricultural University. Promotor(en): A. Kuyvenhoven, co-promotor(en): H. van Keulen. - Wageningen : Wageningen Universite et Centre de Recherche - ISBN 9789054859918 - 184
    landbouwontwikkeling - beleid - economische ontwikkeling - duurzaamheid (sustainability) - productie - technieken - mali - afrika ten zuiden van de sahara - maatregelen - agricultural development - policy - economic development - sustainability - production - techniques - mali - africa south of sahara - measures

    Global situation in Sub-Saharan countries
    Economic development in the Sub-Saharan countries is strongly linked to the agricultural sector, which constitutes the major part of gross national product (GNP) in most of these countries. However, agricultural productivity and production in the area are very low due to erratic rainfall and especially the low level of soil fertility (Penning de Vries & Djitèye, 199; van Keulen & Breman, 1990). Considered world-wide, it is one of the regions with the most unfavourable combination of low agricultural productivity and high population growth. The potential for economic development is limited, because of environmental, agro-technical, socio-economic and institutional constraints.

    Natural resource degradation is most directly linked to (Oldeman et al., 1991)

    1. practicing non-sustainable land use systems, particularly agricultural production techniques without application of mineral or organic fertilisers (24% of the crop land);
    2. over-exploitation of pasture (49% of the area);
    3. over-exploitation of woody resources (27% of the woody land).
    The most important single cause of degradation is the depletion of soil nutrients, including organic matter. Land degradation has serious consequences for agricultural productivity and production, and the availability of arable land. It has been estimated that the availability of arable land will decrease from the current 0.28 ha per capita to 0.17 ha in 2025 (WRI, 1990) and 0.15 ha in 2050 (FAO 1991)

    The situation in Mali
    The economic situation in Mali is characterized by a low GNP per capita (around $270 per annum). The primary sector is the most important one, contributing 46% to GNP, mainly from arable farming and livestock activities (DNSI, 1992). More than 80 % of the work force is employed in the agricultural sector, which generates around 75% of the export revenues.

    Low soil fertility and degradation of natural resources are the most important constraints for agricultural development in Mali. For example, in Southern Mali, the value of the nutrients (at current fertilizer prices, based on replacement value) lost in traditional cropping systems has been estimated (van der Pol, 1992) at about half the value of the gross margin. Hence, a large part of farmers' income originates from soil depletion.

    The study area is the 'Cercle de Koutiala' in Southern Mali, with a total area of 9075 km 2and 286 244 inhabitants, i.e. a population density of about 31 per km 2(BCR, 1991). The Cercle de Koutiala is located at the border of the Soudano-Sahelian zone with monomodal rainfall at an average of 980 mm/year (Sivakumar et al. , 1984). Six main types of soils have been distinguished, with shallow gravelly soils, not suitable for arable farming, occupying the largest area (62%).

    Study objectives and methodology
    The specific objectives of the study are:

    1. definition of agricultural production techniques at different levels of sustainability;
    2. formulation and analysis of a scenario for sustainable agricultural development in the Cercle de Koutiala;
    3. exploration of the potentials and constraints for future land use in the Cercle de Koutiala, based on optimum natural resource management;
    4. analysis of the actual situation, including non-sustainable production techniques at farm household level;
    5. comparison between development options (in terms of production and land use) for situations with and without the possibilities for practicing non-sustainable production techniques;
    6. identification of policy measures to stimulate adoption of sustainable agricultural production techniques at farm household level.

    The research methodology is based on a systems-analysis approach, using linear programming at regional (aggregate) and farm (micro) level. Model structure and procedures are presented in Chapter 3. The different steps followed in the analysis of the results are:

    1. a scenario based on sustainable intensive agricultural production techniques is analysed with a regional model in Chapter 4 to explore the agricultural development perspective for the Cercle de Koutiala;
    2. results of the Farm Household Model, based on non-sustainable agricultural production techniques, are analysed in Chapter 5, with emphasis on the structure of production, (land use), the level of production and the degree of sustainability of the land use systems practiced by different household types;
    3. results at farm level have been aggregated to the regional level on the basis of the total number of different types of farm households in the region for comparison with the development perspectives under sustainable conditions;
    4. policy measures aiming at stimulating the adoption of sustainable technical options are defined, and their impact on farm household behaviour is analysed in Chapter 6;
    5. the influence of some policy measures on aggregate production of cereals at the regional level is analysed as well as its effect on market and price equilibrium.

    Sustainable production systems
    The basic question in the present study is: how to realise the transition from the current non-sustainable practices (associated with ' soil mining ' ) to sustainable intensive cropping systems? To answer that question, a sustainable agricultural development scenario has been defined, based on sustainable agricultural production techniques. For definition of those production techniques, sustainability has been operationalized as 'equilibrium of nutrient balances (including soil organic matter)' to avoid soil nutrient depletion. The resulting land use systems are characterized by strong integration of arable farming, animal husbandry and forestry. Sensitivity analyses have been carried out to analyse the effects of variation in 'level of sustainability' on the level of productivity of cropping systems. The scenario based on "absolutely (no soil nutrient depletion allowed)" sustainable intensive production techniques (SP1) results in the highest level of agricultural production and net revenue, despite higher expenditures on inputs, especially for chemical fertilizer. With increasing levels of soil nutrient depletion (application of 25, 50 and 75 % of the chemical fertilizer needed for equilibrium), productivity and net revenue decrease, the cultivated area increases (extensification), and net revenue per unit area and per capita decrease.

    Non-sustainable production systems
    The farm household model was applied to analyse the effects of the inclusion of non-sustainable production techniques on regional development. The results indicate large differences among farm household types in terms of agricultural productivity and farm management strategy. Farm household types were defined on the basis of access to resources and the degree of mechanisation (animal traction). When maximising net revenue and utility, the level of production and net revenue are appreciably higher for households of type A (well-endowed) than for those of types B and C (less endowed). Comparison of the results of the absolutely sustainable scenario (SP1) with those of scenario SB1 (actual situation) shows large differences in allocation of natural resources (land use), production and level of sustainability. Adoption of intensive, sustainable production techniques requires some major actions at farm household level:

    1. efficient land resource management, i.e. land use adapted to land qualities and suitability;
    2. integration of silviculture to satisfy wood requirements;
    3. intensification of livestock systems through introduction of high-quality supplementary feed. This leads to the conclusion that complementary policy measures are indispensable to stimulate adoption of sustainable and intensive technical production techniques.

    Policy measures
    Policy measures have been identified and their impact on farm household behaviour has been analysed using a farm household model. The policy measures considered include: price policy, market development policy, credit policy, natural resources management policy, and agricultural intensification policy. The policy measures could be classified in four main types on the basis of their effects on net revenue and sustainability level:

    1. policy measures having a strong positive effect on both net revenue and sustainability level;
    2. policy measures having a moderately positive effect on net revenue and sustainability level;
    3. policy measures having a moderately positive effect on net revenue and a negative effect on sustainability level;
    4. policy measures having a negative effect on both net revenue and sustainability level.

    Results indicate that several policy measures can have a strong effect on farm household behaviour. However, farm households vary strongly in their reactions to policy measures. Farm households of type A, for example, show an adoption rate of sustainable intensive production techniques of about 40% (expressed as the proportion of the area cultivated with these techniques) compared to 20% and 11% for types B and C, respectively. However, even when implementing the most effective policy measures, farm households generally combine non-sustainable and sustainable production techniques. The rate of adoption of sustainable intensive techniques strongly depends on their profitability. Hence, all policy measures that contribute to improved profitability of the alternative production techniques, by reducing their cost/benefit ratio, will stimulate increased rates of adoption at the farm household level. At the regional level, the most effective policy measures have a strong impact on development objectives through increasing the level of production and net revenue per ha and per capita. These policy measures also have a strong positive impact on the rate of adoption of sustainable and intensive production techniques at the farm household level. Some policy measures also induce changes in total production and hence in the demand/supply balance of cereals at the regional level. This may lead to price changes causing a new market equilibrium.

    The analyses of the effects of policy measures at farm household and regional level illustrate the potential role of such models in policy support in the macro-economic policy formulation process.

    From non-sustainability to strong sustainability: what are the possibilities for on-farm practices?
    The results from the regional model indicate that when sustainable intensive cropping systems are introduced, using high input levels, particularly of chemical fertilizers, high levels of production can be attained. However, such sustainable intensive systems cannot be adopted in the short term because of technical, socio-economic and institutional constraints. These constraints are mainly linked to availability of mineral fertilizers and profitability of their use.

    Therefore, what is required to realize the transition from the current non-sustainable practices to strong or absolute sustainability? Sustainable agricultural development requires at least a change in farm household behaviour by adopting sustainable and intensive production techniques.

    In the short and medium term, farm households can adapt by introducing improved, intensified forage production techniques (leguminous species), which will have a positive impact on soil fertility and livestock feed supply. For the long term, the results of the analysis of effects of policy measures have indicated that the rate of adoption of sustainable technologies can be increased through appropriate policy measures.

    Thus, a set of policy measures is necessary to stimulate introduction of sustainable agriculture practices at the farm level such as: increasing profitability of the use of mineral fertilizers, land improvement, improved land tenure regulations, decentralization of the responsibilities for implementation of development measures, coordination of development activities at regional level, stimulation of investments in rural areas, and of scientific and technical research oriented towards sustainable agricultural development.

    The Cercle de Koutiala is one of the regions in Mali with high agricultural potential, but agricultural production growth should not be realised on the basis of soil nutrient depletion, since that will trigger land degradation and environmental problems in the long term. Macro-economic policy measures are necessary to provide incentives to farm households to adopt sustainable and intensive production techniques. Only in that way will it be possible for the Cercle de Koutiala to maintain its important place in Mali's sustainable agricultural development process.

    Rotation models for ecological farming : CAMASE/PE workshop report
    Plentinger, M.C. ; Penning de Vries, F.W.T. - \ 1997
    Wageningen : AB-DLO (Quantitative approaches in systems analysis 10) - 138
    rotaties - biologische landbouw - simulatiemodellen - systeemanalyse - rotations - organic farming - simulation models - systems analysis
    Data use and Bayesian methods for model calibration
    Jansen, M.J.W. - \ 1997
    In: Data in Action. Graduate School for Production Ecology & AB-DLO: Quantitative Approaches in Systems Analysis, No. 12 / Stein, A., Penning de Vries, F.W.T., Schut, J.W., - p. 59 - 69.
    Modelling reactive oxygen species scavenging and acclimating mechanisms to environmental temperature stress
    Haren, R.J.F. ; Penning de Vries, F.W.T. - \ 1997
    In: Book of Abstracts. International Workshop on Prospects for Co-ordinated Activities in Core Projects of GCTE, BAHC and LUCC, 16-19 November 1997, Wageningen, the Netherlands / van de Geijn, S.C., Kuikman, P.J., - p. 60 - 61.
    CAMASE. a Concerted Action for the development and testing of quantitative Methods for research on Agricultural Systems and the Environment
    Plentinger, M.C. ; Penning de Vries, F.W.T. - \ 1997
    Unknown Publisher - 19 p.
    A research approach to analyze food security scenarios for China
    Groot, J.J.R. ; Penning de Vries, F.W.T. ; Jikun Huang, - \ 1997
    In: Proceedings Workshop Wageningen-China, Wageningen, May 13th, 1997 Report 84, AB-DLO, Wageningen/Haren / Uithol, P.W.J., Groot, J.J.R., - p. 39 - 48.
    From fields to models: the data story: feeding models that should not be used.
    Bouma, J. - \ 1997
    In: Data in Action: proceedings of a seminar series 1996/1997 / Stein, A., Penning de Vries, F.W.T., Schut, J.W., - p. 159 - 161.
    Om de voedselzekerheid van onze kleinkinderen: potentiele productie en potentiele consumptie tegenover elkaar geplaatst.
    Penning de Vries, F.W.T. ; Rabbinge, R. ; Keulen, H. van; Groot, J.J.R. - \ 1997
    Spil 149/152 (1997). - ISSN 0165-6252 - p. 45 - 51.
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