Artikkelit jotka sisältää sanan 'nitrification'
Quantitative simulation of biochemical processes in peatlands as a tool to define sustainable use.
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A natural property of mires is their ability to accumulate carbon and nutrients in the form of peat.Drainage and agricultural land use have changed the nutrient balance from accumulation to mobilisation.In this study, the effect of land use and hydrology on nitrogen dynamics is quantified using a GIS-based dynamic modelling approach.In the simulation, the nitrogen budget is controlled by drainage depth, land use type and fertilizer application.Denitrification is, next to harvest, the quantitatively most impor tant output pathway from peat soils with a predominant vertical water flow.Only for the wet Caricion elatae type was a net nitrogen accumulation simulated.The spatial visualisation of the nitrogen balance shows a high variability based on the heterogene ity of the peatland.Rewetting and extensivication can reduce the deficit in the nitrogen balance and lead to a slight increase of the accumulating area.These simulation results can be used in environmental planning to define a more sustainable land use in the future.
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Trepel,
Royal Danish School of Pharmacy, Section of Environmental Chemistry, Universitetsparken 2, DK-2100 Copenhagen, Denmark
Sähköposti:
ei.tietoa@nn.oo
- Davidsson, Sähköposti: ei.tietoa@nn.oo
- Jørgensen, Sähköposti: ei.tietoa@nn.oo
Nitrogen and phosphorus fractions as indicators of organic soil quality.
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The state of the environment is currently evaluated by indicators of air and water quality. Sustainable land use requires an assessement of soil quality. Soil quality indicators should relate soil processes to management practices. The supply of N and P contributes to crop productivity, but can degrade air and water quality. In this paper, we will present organic soil N and P attributes that can make up soil functions. Nitrate was the only detected mineral N form in organic soil materials with pH (0.01M CaCl2 ) exceeding 4.4. Lowest C/N ratio of cultivated sapric soil materials was 15, showing high nitrate-supplying capability. Total P concentration was between 760 and 1960 mg P kg–1 both in organic and inorganic forms when pH (0.01M CaCl2 ) increased above 4.7, the recommended minimum pH value for cultivated organic soils. Lowest C/P ratio as organic forms was 340 for sapric materials containing less than 22% ash, indicating organic P sequestration capability (C/P > 300). However, the low N/P ratio of 23 (i.e. 340/15) also indicated capability for organic P availability to plants. Since N and P are related to organic matter transformations, the C/N/P/S multiratios of selected organic matter fractions, analyzed as compositional data (computation procedure presented), need further consideration as integrated N and P attributes in combination with pH and climatic indexes, in order to adapt N and P diagnosis and recommendation models to specific organic soil agroecological zones.
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Parent,
Centre de Recherche en Géomatique, Laval University, Ste-Foy (Quebec), Canada G1K 7P4
Sähköposti:
ei.tietoa@nn.oo
- Viau, Sähköposti: ei.tietoa@nn.oo
- Anctil, Sähköposti: ei.tietoa@nn.oo
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