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| Registros recuperados: 27 | |
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| Dalgaard, Tommy; Hutchings, Nicholas J.; Dragosits, U.; Olesen, J.E.; Kjeldsen, Chris; Drouet, J.L.; Cellier, P.. |
| The aim of this study is to illustrate the importance of farm scale heterogeneity on nitrogen (N) losses in agricultural landscapes. Results are exemplified with a chain of N models calculating farm-N balances and distributing the N-surplus to N-losses (volatilisation, denitrification, leaching) and soil-N accumulation/release in a Danish landscape. Possible non-linearities in upscaling are assessed by comparing average model results based on (i) individual farm level calculations and (ii) averaged inputs at landscape level. Effects of the non-linearities that appear when scaling up from farm to landscape are demonstrated. Especially in relation to ammonia losses the non-linearity between livestock density and N-loss is significant (p > 0.999), with... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions; Landscape and recreation; Farm nutrient management. |
| Ano: 2011 |
URL: http://orgprints.org/19043/4/19043.pdf |
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| Andersen, Liselotte Wesley; Marchi, Chiara; Strandberg, Beate; Bruus Pedersen, Marianne; Damgaard, Christian; Jensen, Thomas Secher; Olsen, Kent; Dalgaard, Tommy; Topping, C.J.. |
| • Økologiske marker har mere ukrudtsbiomasse end konventionelle. • Der er flere blomstrende arter i økologiske hegn end konventionelle forudsat, at der er kontinuitet i den økologiske drift. • Der er flere små pattedyr i små økologiske biotoper end konventionelle. • Fjernmålinger fra fly eller satellit, kaldet remote sensing, kan skelne hvilken afgrødetype der dyrkes, samt forekomsten af småbiotoper. • Uanset driftformen er det vigtigt at inddrage naturhensyn i driften, dvs., at der findes ekstensivt drevne arealer (græsmarker, overdrev, enge) til natur og direkte afsatte arealer til natur. |
| Tipo: Other |
Palavras-chave: "Organics" in general; Biodiversity and ecosystem services. |
| Ano: 2010 |
URL: http://orgprints.org/23299/7/23299.pdf |
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| Uthes, Sandra; Piorr, Annette; Zander, Peter; Bienkowski, Jerzy; Ungaro, Fabrizio; Dalgaard, Tommy; Stolze, Matthias; Moschitz, Heidrun; Schader, Christian; Happe, Kathrin; Sahrbacher, Amanda; Damgaard, Martin; Toussaint, Verena; Sattler, Claudia; Reinhard, Franz-Josef; Kjeldsen, Chris; Casini, Leonardo; Müller, Klaus. |
| The direct payment system of the Common Agricultural Policy (CAP) provides income transfers to European farmers. Recently, several countries including England and Sweden have advocated the elimination of direct payments after 2013. The extent to which an elimination of direct payments would affect the land use dynamics in Europe including impacts on structural change and the environment has not been addressed in the existing literature. In this paper, we combine participatory methods, to analyze regional preferences for functions and effects of agriculture, and farm-level modeling, to assess the impacts of such a policy change on farm structures and land use intensities in four European regions located in Germany, Denmark, Italy and Poland, each with... |
| Tipo: Journal paper |
Palavras-chave: Farming Systems; Policy environments and social economy. |
| Ano: 2011 |
URL: http://orgprints.org/21184/1/Uthes-etal-2011-AgriculturalSystems-Vol104-p110-121.pdf |
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| Christen, Ben; Dalgaard, Tommy. |
| In addition to their potential for biomass production, buffer strips on agricultural land have been shown to protect surface water quality by reducing erosion and nutrient leaching, and can play a key role in nature and flood protection, and the design of bioenergy landscapes resilient to climate changes, and the environmental pressures from intensive agriculture. Use of conservation buffers by farmers outside of designated schemes is very limited to date, but the increasing demand for bioenergy and the combination of agricultural production with nature protection calls for a much wider implementation. This paper reviews the knowledge on buffer functioning, socioeconomics and practical farming aspects. It describes how a defined three-zone buffer design,... |
| Tipo: Journal paper |
Palavras-chave: Biodiversity and ecosystem services; Landscape and recreation; Farm nutrient management. |
| Ano: 2013 |
URL: http://orgprints.org/18937/4/18937.pdf |
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| Graef, Frieder; Römbke, Jörg; Binimelis, Rosa; Myhr, Anne Ingeborg; Hilbeck, Angelika; Breckling, Boder; Dalgaard, Tommy; Stachow, Ulrich; Catacora-Vargas, Georgina; Bohn, Thomas; Quist, David; Darvas, Béla; Dudel, Gert; Oehen, Bernadette; Meyer, Hartmut; Henle, Klaus; Wynne, Brian; Metzger, Marc J.; Knäbe, Silvio; Settele, Josef; Székács, András; Wurbs, Angelika; Bernard, Jeannette; Murphy-Bokern, Donal; Buiatti, Marcello; Giovannetti, Manuela; Debeljak, Marko; Andersen, Erling; Paetz, Andreas; Dzeroski, Saso; Tappeser, Beatrix; van Gestel, Cornelis A.M.; Wosniok, Werner; Séralini, Gilles-Eric; Aslaksen, Iulie; Pesch, Roland; Maly, Stanislav; Werner, Armin. |
| The assessment of the impacts of growing genetically modified (GM) crops remains a major political and scientific challenge in Europe. Concerns have been raised by the evidence of adverse and unexpected environmental effects and differing opinions on the outcomes of environmental risk assessments (ERA). The current regulatory system is hampered by insufficiently developed methods for GM crop safety testing and introduction studies. Improvement to the regulatory system needs to address the lack of well designed GM crop monitoring frameworks, professional and financial conflicts of interest within the ERA research and testing community, weaknesses in consideration of stakeholder interests and specific regional conditions, and the lack of comprehensive... |
| Tipo: Journal paper |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2012 |
URL: http://orgprints.org/23020/1/Graef-etal-2012-BioRisk-Vol7-p73-97.pdf |
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| Andersen, Liselotte Wesley; Marchi, Chiara; Strandberg, Beate; Topping, C.J.; Jensen, Thomas Secher; Olsen, Kent; Bruus Pedersen, Marianne; Damgaard, Christian; Dalgaard, Tommy. |
| Organic farming is generally acknowledged for its positive effects on biodiversity and other landscape services. However, the intensity of farming has changed significantly through the last decade as ranks of traditional holistic organic farmers have been joined by much more economically-driven new organic farmers. At the same time there have also been steady improvements in farming methodology and crop types resulting in efficiency in organic farming which can often rival its conventional counterparts. Therefore, large variations occur between organic farms. |
| Tipo: Other |
Palavras-chave: "Organics" in general. |
| Ano: 2008 |
URL: http://orgprints.org/23298/7/23298.pdf |
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| Halberg, Niels; Refsgaard, Karen; Dalgaard, Tommy. |
| Energiforbruget i jordbrugsproduktionen er interessant både fra et ressource synspunkt og fordi udledningen af CO2 fra forbrænding af fossil energi bidrager til drivhuseffekten. Både i målsætningerne for den danske Landsforening for økologisk jordbrug (LØJ) og i landboorganisationernes oplæg til Godt landmandsskab år 2000 indgår desuden mål om at reducere forbruget af fossil energi og få den bedst mulige energiudnyttelse. Ved en kombination af studier i økologiske og konventionelle kvægbrug og brug af standardværdier for dieselforbrug til de enkelte markoperationer er der opstillet modeller for energiforbruget i mark og stald. I energiregnskaberne indgår både det direkte (diesel + el) og det indirekte energiforbrug (f.eks. energi medgået til produktion af... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Production systems Recycling; Balancing and resource management. |
| Ano: 1999 |
URL: http://orgprints.org/6554/1/6554.pdf |
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| Dalgaard, Tommy; Halberg, Niels; Fenger, Jes. |
| Formålet med rapporten er at beskrive og anvende en metode til at vurdere ændringen i landbrugets forbrug af fossil energi og emission af drivhusgasser ved omlægning til 100% økologisk jordbrug i Danmark. Situationen for dansk landbrug i 1996 er sammenlignet med tre scenarier for 100% omlægning: A) Fuld selvforsyning med foder (0% import). Herved begrænses den mulige svineproduktion. B) 15% import af foder til drøvtyggere og 25% import til enmavede dyr (15-25% import). Også her begrænses svineproduktionen, men dog mindre en i scenario A. C) Fastholdelse af den samme animalske produktion som i 1996 (ubegrænset foderimport). |
| Tipo: Report |
Palavras-chave: Air and water emissions. |
| Ano: 2000 |
URL: http://orgprints.org/3031/1/Rap_05.pdf |
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| Dalgaard, Tommy. |
| State of the art GIS and database technologies for landscape scale analysis and the modelling of land use and environmental impacts are presented. These methods have been developed at University of Aarhus in multidisciplinary collaboration with other research institutions throughout Europe; for example during the EU research projects www.mea-scope.org and www.sensor-ip.eu. In the years to come, these landscape scale research methods are further developed and integrated with similar frameworks in other EU countries, and used for scenario studies (see for example the landscape components of http://www.nitroeurope.eu/, http://www.darcof.dk/research/darcofiii/refugia.html or http://www.darcof.dk/research/darcofiii/bioconcens.html). Scenario studies,... |
| Tipo: Book chapter |
Palavras-chave: Landscape and recreation; Biodiversity and ecosystem services; Air and water emissions. |
| Ano: 2009 |
URL: http://orgprints.org/19313/1/19313a.pdf |
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| Boegh, E.; Houborg, R.; Bienkowski, J.; Dalgaard, Tommy; Dragisits, U.; Magliulo, E.. |
| Leaf biochemistry and biophysical parameters are important for simulating soil‐vegetation‐atmosphere exchanges of energy, water, CO2 and ammonia. The accumulation of leaf nitrogen (N) in vegetation canopies is a major component of the ecosystem N balance, and leaf N concentration and leaf area index (LAI) are important determinants of the maximum CO2 uptake by plants and trees. In NEU, high spatial resolution remote sensing data from the SPOT satellite were acquired to prepare maps of leaf N and LAI for 5 European landscapes. Mapping was conducted using the REGFLEC model which is an automatic and image‐based methodology developed for regional chlorophyll (Cab) and LAI estimation (ie. Houborg and Andersen, JARS 3, 2009). REGFLEC combines models for... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions; Biodiversity and ecosystem services; Landscape and recreation. |
| Ano: 2011 |
URL: http://orgprints.org/19047/4/19047.pdf |
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| Dalgaard, Tommy. |
| The organic farming structure has been analysed for all farms in Denmark 2005-2010. In 2005, the average farm size for organic farms was 50 ha, compared to 40 ha for conventional farms. For organic farms the largest average farm size in on sandy soils and for cattle farms, whereas the for conventional farms, the largest farms are on loamy soils, and cash crop, and pig farms. The farms has been classified into farm types accoring to the EUROSTAT methods. Hobby farms are defined with a number of standard working hours under 1871 timer/år (typically under 10-25 ha). These farms normally are not included in national statistics, but are important to include in the REFUGIA studies, because these farms are important for biodiversity and have a relatively higher... |
| Tipo: Working paper |
Palavras-chave: Farm economics; Air and water emissions; Biodiversity and ecosystem services; Landscape and recreation; Denmark; Farm nutrient management. |
| Ano: 2011 |
URL: http://orgprints.org/18941/1/18941.pdf |
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| Andersen, Liselotte Wesley; Marchi, Chiara; Strandberg, Beate; Topping, C.J.; Pedersen Bruus, Marianne; Damgaard, Christian F.; Jensen Secher, Thomas; Olsen, Kent; Dalgaard, Tommy; Bøcher Klit, Peder. |
| Oplæg til afsluttende workshop omkring Darcof III. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: "Organics" in general; Biodiversity and ecosystem services. |
| Ano: 2010 |
URL: http://orgprints.org/19055/4/19055.pdf |
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| Jørgensen, Uffe; Dalgaard, Tommy; Kristensen, Erik Steen. |
| One of the aims of organic farming is to “reduce the use of non-renewable resources (e.g. fossil fuels) to a minimum”. So far, however, only very little progress has been made to introduce renewable energy in organic farming. This paper presents energy balances of Danish organic farming compared with energy balances of conventional farming. In general, the conversion to organic farming leads to a lower energy use (approximately 10% per unit of product). But the production of energy in organic farming is very low compared with the extensive utilisation of straw from conventional farming in Denmark (energy content of straw used for energy production was equivalent to 18% of total energy input in Danish agriculture in 1996). Biomass is a key energy carrier... |
| Tipo: Journal paper |
Palavras-chave: Recycling; Balancing and resource management. |
| Ano: 2005 |
URL: http://orgprints.org/3959/1/3959_Biomass.pdf |
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| Strandberg, Beate; Damgaard, Christian; Dalgaard, Tommy. |
| Agri-environment schemes such as organic farming has been implemented to counteract declines in farmland biodiversity but comparisons to conventional farming have produced variable outcomes depending on both taxa and landscape factors. However, changes in land-use may not always result in rapid changes in species distributions and diversity. The importance of such a time-lag between transition to organic farming and species responses have received little attention. We investigated the effect of time since transition from conventional to organic practice on the biodiversity of hedgerow ground vegetation in 30 hedgerows within two landscapes of different heterogeneity and land-use intensity. We found that time since transition of the neighbouring... |
| Tipo: Journal paper |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2013 |
URL: http://orgprints.org/23272/2/23272.pdf |
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| Andersen, Liselotte Wesley; Marchi, Chiara; Topping, C.J.; Strandberg, Beate; Bruus Pedersen, Marianne; Damgaard, Christian; Jensen, Thomas Secher; Olsen, Kent; Dalgaard, Tommy. |
| Changes in agriculture might drive changes in biodiversity and are expected to have just as serious an effect as climate change. These changes are results of complex changes in land-use as well as land management, intensification of management and structural developments in agriculture. In this review we present results of a recent research project (ICROFS 2013) focusing on organic farming and biodiversity in Denmark and relate the results to international studies that focus on drivers of biodiversity in the agricultural landscape. The project was organized under five major themes, forming the main sections of the present review paper: Impact on i) plant biodiversity ii) insect and food-webs in cereal fields, iii) small mammals, iv) natural genetic... |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general. |
| Ano: 2013 |
URL: http://orgprints.org/23312/13/23312.pdf |
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| Registros recuperados: 27 | |
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