2,637 research outputs found
Repression of potential nitrification activities by matgrass sward species
No full textAbstract Soil nitrification is a key process in regulating the relative availability of the various inorganic N forms to plants. In the current study, we investigated the effect of different plant species on numbers of ammoniaoxidizing microbial cells by measuring the potential nitrification activity (PAA). Soil from matgrass sward and from calcareous grassland was collected in the field and four characteristic plant species of each vegetation type were cultivated from seed. These plant species grew for 4 months in the two soil types. After those
4 months, PAA were significantly higher in calcareous soil compared to the matgrass sward soil and the presence of matgrass sward species had significantly decreased PAA in this soil. In soils from matgrass stands, PAA were much lower, and no effect of the different plant species could be detected. Plant biomass of the calcareous grassland species was overall positively correlated with PAA, whereas for matgrass plant species a negative trend was found. We conclude that matgrass sward plant species had a clear repressing
effect on the potential ammonia-oxidizing activity in calcareous grassland soil within this 4-month growth experiment. The observed repression of PAA is in accordance with earlier field observations of PAA in the different vegetation zones, where repressed PAA and significant higher ammonium to nitrate ratios were observed in the matgrass sward vegetation compared to the other vegetation zones. Major findings of this study indicate that plant species can influence the nitrification potential of their habitats, i.e. certain species can repress
nitrification potential and others can increase nitrification potential of their habitats.
Conversation avec le Prof. J.C. Sens et G. Bobbink, utilisateurs du CERN et membres du NIKHEF (Hollande)
No full textBook reviews
No full textWard, J. V. and U. Uehlinger (eds.) 2003. Ecology of a Glacial Flood Plain. Kluwer Academic Publishers, Dordrecht, xvii+320 pp. ISBN: 1-4020-1792-8, hard cover, price: EUR 90, USD 99, GBP 62.; Heil, G. W., R. Bobbink and N. T. Boix (eds.) 2003. Ecology and Man in Mexico's Central Volcanoes Area. Kluwer Academic Publishers, Dodrecht, ix+222 pp. ISBN 1-4020-1708-1, hard cover, price: EUR 130, USD 143, GBP 89.5.
No calm before the storm: A landward coastal defence alternative in the Westland as guide for new spatial developments
No full textEen ontwerpend onderzoek naar de mogelijkheden om een landwaarts kustverdedigingsalternatief te combineren met nieuwe ruimtelijke ontwikkelingen in het Westland.Architectur
Energize vacant land: Landscape regeneration in shrinking Kerkrade West
No full textThe project is aimed at using landscape proposals to inspire public participation changing their own living environment in shrinking cities. The strategy shows a landscape urbanism process, works at different scales and provides different possibilities towards a prospective future.Hybrid LandscapeLandscape ArchitectureArchitectur
Riverscape in Basel region
No full textWhen we take a close look to the relation between humans and nature, we can see that humans have trying to control the natural environment in order to get protection from the strong forces that its elements have and to take advantage of its sources. During the past decades and centuries humans have achieved a power over some elements of the natural environment such as the rivers. We have used the rivers as a way of transportation from the beginning of our times until nowadays, they have also been used as sewage system; situation which is changing from some years ago and we have reclaimed terrain from the flood areas for agriculture development. All these new ways of using the rivers have transformed this element. When we talk about the rivers we not only refer to the stream of water, we refer to the stream and the areas surround by it, which is known as the riparian zone. This zone is interconnected to the river stream in many ways so they both protect and evolve together. The area varies depending on the morphology of the river, it can be just a stripe of vegetation with the riverbanks or it can include a floodplain area and sometimes it can be extended until the begging of the hillslope. They have a vital importance on the processes and dynamics of the river and all the species related with this ecosystem. Over time the control of the rivers by humans took us to modify the riparian zones and by extension the streams of the rivers. Based on the case of the Rhine River we will see some changes made to the river. Focus on the region of Basel we will expose more in detail how the river borders have been transformed leading us to adjust our view over the way we treat the river. A new view of the transformed border of the river will be expose based on the integration of the built and the natural environment that will allow the development of both environments.LandscapeUrbanismArchitecture and The Built Environmen
Perspectieven voor hoogveenherstel in Nederland
No full textContains fulltext :
32840.pdf (Publisher’s version ) (Open Access
Study of Bc+→J/ψDs+ and Bc+→J/ψDs∗+ decays in pp collisions at √s = 13 TeV with the ATLAS detector
No full textA study of Bc+→J/ψDs+ and Bc+→J/ψDs∗+ decays using 139 fb−1 of integrated luminosity collected with the ATLAS detector from s = 13 TeV pp collisions at the LHC is presented. The ratios of the branching fractions of the two decays to the branching fraction of the Bc+→ J/ψπ+ decay are measured: B(Bc+→J/ψDs+)/B(Bc+→J/ψπ+) = 2.76 ± 0.47 and B(Bc+→J/ψDs∗+)/B(Bc+→J/ψπ+) = 5.33 ± 0.96. The ratio of the branching fractions of the two decays is found to be B(Bc+→J/ψDs∗+)/B(Bc+→J/ψDs∗+) = 1.93 ± 0.26. For the Bc+→J/ψDs∗+ decay, the transverse polarization fraction, Γ±±/Γ, is measured to be 0.70 ± 0.11. The reported uncertainties include both the statistical and systematic components added in quadrature. The precision of the measurements exceeds that in all previous studies of these decays. These results supersede those obtained in the earlier ATLAS study of the same decays with s = 7 and 8 TeV pp collision data. A comparison with available theoretical predictions for the measured quantities is presented. [Figure not available: see fulltext.]
Villa Huisduinen - A Place for Retreat - Palimpsest in Architecture
No full textI am intrigued by buildings, landscapes, objects and the relationship between them. I am also interested in the transformative processes of time and history. One of the beautiful and poetic theories that captures the continuity of history is that of the palimpsest. The project is two folded in the sense that it consists of a research and a design project. The research resulted in a book that portrays the concept of palimpsest in architecture in relation to six personal observations. For each observation an analysis is presented of a representative project of the following architects: Fernando Távora (place), Dimitris Pikionis (reuse), Rafael Moneo (memory), David Chipperfield (traces), Rudolf Schwarz (materiality) and Carlo Scarpa (dialogue). The design project evolved from the ideas developed during the research. For the project a derelict site - just outside of the traditional Dutch village of Huisduinen - is chosen containing three abandoned buildings made by the Germans during World War II. One of these buildings partially burned down five years ago and is now a ruin. The site is transformed into a place for retreat called "Villa Huisduinen", a secret oasis where people can rest, wander and enjoy the various aspects of the existing landscape.ExplorelabArchitectureArchitecture and The Built Environmen
De Lustlijn
No full textDe Noordoostpolder is in de jaren veertig drooggelegd met als doel de vergroting van het Nederlandse landbouwareaal. Het nieuwe land werd zo ontworpen dat zowel de ruimtelijke inrichting als het functioneren van de samenleving geheel ten dienst stond van de landbouw. De kolonistenselectie, het verkavelingspatroon, het ritme van de boerderijen en de positionering van de dorpen en het poldercentrum onderstrepen de planologische voorbeeldigheid van die tijd. De bewoners waren allemaal op een bepaalde manier aan de landbouw gerelateerd. De wijze waarop deze landbouwsamenleving functioneerde is nog steeds afleesbaar uit de ruimtelijke structuur van de hedendaagse Noordoostpolder. Het is een produktielandschap. Landbouw was, is en zal in de toekomst de primaire functie van de Noordoostpolder zijn. Maar door de mechanisatie en de schaalvergroting van de agrarische bedrijven is het aantal boeren gehalveerd en zijn de overige bewoners geen landarbeider meer. De samenleving van de Noordoostpolder is niet meer eenzijdig gericht op de landbouw en krijgt meer stedelijke invloeden. Daardoor is de landbouwidentiteit van de samenleving afgezwakt. De bewoners in de Noordoostpolder hebben onder andere behoefte aan functies gekregen die gericht zijn op vrijetijdsbesteding. De provincie Flevoland ziet hier een nieuwe bron van inkomsten, doordat ook mensen buiten de polder deze functies in de Noordoostpolder zullen gebruiken. Voor deze functies is een masterplan ontwikkeld dat de Noordoostpolder opdeelt in drie zones: een landbouw-, een cultuurhistorische en een vrijetijdsbesteding zone. Deze opdeling is volgens mij een misstap. De zonering zal de eenheid van het karakteristieke Noordoostpolderlandschap aantasten. Ook zal de identiteit van de Noordoostpolder, die zo sterk samenhangt met haar ruimtelijke context, door deze zonering veranderen.Architectur
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