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| Registros recuperados: 10 | |
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| Larsen, T.; Magid, J.; Krogh, P.H.; Gorissen, A.. |
| Experimental data is still lacking for determining the significance of plant uptake of dissolved organic nitrogen (DON) in agricultural soils amended with organic fertilizers. Pulse-injection studies with dual-labelled amino acids have confirmed that non-mycorrhizal crops possess the capacity to take up DON but failed to quantify the uptake relative to total N uptake. In this study, dual-labelled green manure was added to soils with wheat plants. An advantage of using dual-labelled green manure as opposed to pulse injection of dual-labelled amino acids is that the amino acids in the fertilizer are released gradually, thus more naturally, and are therefore less susceptible to immediate microbial immobilization. The plants were harvested on days 27, 56, and... |
| Tipo: Journal paper |
Palavras-chave: Soil biology. |
| Ano: 2005 |
URL: http://orgprints.org/5859/1/5859.doc |
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| Krogh, P.H.; Lamandé, M.; Eriksen, J.; Holmstrup, M.. |
| Clover grass is an important element in crop rotations due to its beneficial agronomic properties including nitrogen build-up, biodiversity stimulation and maintenance of soil macropores and it harvests very high levels of earthworm biomass. We studied the relationship between crucial ele-ments of a clover grass crop rotation and earthworm diversity and macropore depth distribution. The dominance of anecics increased from the annual crops to the perenial clover-grass. Aporrec-todea tuberculata decreased significantly Cattle grazing seems to favour coarse macropores made by anecics, Aporrectodea longa and Lumbricus terrestris. Our study stresses the importance of considering subsoil macropores to complete the picture of earthworm influence on soil... |
| Tipo: Journal paper |
Palavras-chave: Soil quality; Biodiversity and ecosystem services. |
| Ano: 2012 |
URL: http://orgprints.org/20691/4/20691.pdf |
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| Demsar, D.; Dzeroski, S.; Larsen, T.; Struyf, J.; Axelsen, J.; Bruus-Pedersen, M.; Krogh, P.H.. |
| In agricultural soil, a suite of anthropogenic events shape the ecosystem processes and populations. However, the impact from anthropogenic sources on the soil environment is almost exclusively assessed for chemicals, although other factors like crop and tillage practices have an important impact as well. Thus, the farming system as a whole should be evaluated and ranked according to its environmental benefits and impacts. our starting point is a data set describing agricultural events and soil biological parameters. Using machine learning methods for inducing regression and model trees, we produce empirical models able to predict the soil quality from agricultural measures in terms of quantities describing the soil microarthropod community. We are also... |
| Tipo: Journal paper |
Palavras-chave: Soil biology; Biodiversity and ecosystem services. |
| Ano: 2006 |
URL: http://orgprints.org/7992/1/7992.pdf |
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| Axelsen, J.; Thorup-Kristensen, K.; Askegaard, M.; Krogh, P.H.. |
| The abundance and species composition of soil living mites and Collembola were investigated in autumn and winter in field plots with five different types of catch crops and a control plot that was kept free of vegetation. The catch crops, chicory, white clover, garden lupine, and perennial ryegrass were undersown in barley while fodder radish was sown after harvest .The investigation was carried out at a site on sandy loam and a site on coarse sand. At the sandy site densities up to about 250.000 and 100.000 m-2 of mites and Collembola, respectively, were found. At the sandy loam site densities were up to 120.000 mites m-2 and 150.000 Collembola m-2. The densities of both microarthropods were extremely high with up to 120,000 Collembola m-2 and 90,000... |
| Tipo: Journal paper |
Palavras-chave: Soil biology; Biodiversity and ecosystem services. |
| Ano: 2006 |
URL: http://orgprints.org/7988/1/7988.doc |
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| Pernin, C.; Ambrosi, J.P.; Cortet, J.; Joffre, R.; Tabone, E.; Torre, F.; Krogh, P.H.. |
| A laboratory mesocosm experiment was performed to study the effects of copper-enriched sewage sludge application on a mesofauna community. For 12 weeks, characteristics and changes in this defined and artificial mesofauna community structure were monitored as well as the dynamics of leaf litter decomposition. The mesofauna community comprised six species of Collembola (Folsomia fimetaria, Isotomurus prasinus, Lepidocyrtus cyaneus, Mesaphorura macrochaeta, Parisotoma notabilis, Protaphorura armata), two species of acari Oribatida (Achipteria coleoptrata, Adoristes sp.), one species of acari Gamasida Hypoaspis aculeifer) and one species of enchytraeid (Enchytraeus crypticus). Three treatments included the addition of 22 g dry weight (DW) sludge spiked with... |
| Tipo: Journal paper |
Palavras-chave: Landscape and recreation; Soil biology; Biodiversity and ecosystem services; Soil quality. |
| Ano: 2006 |
URL: http://orgprints.org/21199/2/21199.pdf |
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| Lamandé, M.; Eriksen, J.; Krogh, P.H.; Jacobsen, O.H.. |
| Organic dairy farming is characterized by grazing cows in contrast to Danish conventional farms where the majority of cows are kept indoors. Cattle trampling reduces the finer macroporosity in the top 5-10 cm of the soil. This causes a low infiltration capacity at the soil surface, giving a higher probability of macropore flow from the surface. Rapid water movement through macropores bypasses the soil matrix, reducing nitrate leaching. We investigated how three years of cattle trampling in organic grass-clover fields could influence the risk of nitrate leaching in the autumn. The experimental part of this study was situated in Denmark on a loamy sand within a long-term organic dairy crop rotation trial. Experimental plots were irrigated with a concentrated... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions; Biodiversity and ecosystem services. |
| Ano: 2010 |
URL: http://orgprints.org/20676/5/20676.pdf |
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| Axelsen, J.; Bruus-Pedersen, M.; Larsen, T.; Krogh, P.H.. |
| Soil fauna diversity, as well as total mite and springtail numbers was correlated with soil type, tillage intensity and fertiliser use as well as crop and grazing history and duration of the current state of the field. 430 samples taken in 2002 on a wide range of organically farmed fields also showed that soil type interacted with crop type and grazing intensity. A higher number of mites and springtails were found in crops that included clover, almost independently of soil type. Higher numbers of mites were found at high grazing intensity compared to low grazing intensity on the same soil type. In 2003, microarthropods were collected in spring, summer and autumn in Southern Jutland, Mid-Jutland and Sealand. In each region both cereal and vegetable fields... |
| Tipo: Journal paper |
Palavras-chave: Biodiversity and ecosystem services; Soil tillage. |
| Ano: 2006 |
URL: http://orgprints.org/7981/2/7981.pdf |
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| Lamandé, M.; Eriksen, J.; Krogh, P.H.; Jacobsen, O.H.. |
| Managed grasslands are characterized by rotations of leys and arable phases. Soil structure is inherited from the last tillage operations (ploughing, harrowing) and evolves during the leys because of climate, earthworms and roots activity, fertilisation, cutting operations or cattle trampling. We tested the effects of the duration of the leys, cattle trampling, and fertilisation on the infiltration of water in the soil profile in managed grasslands. The experiment was situated within the dairy crop rotation on loamy sand at the Foulum experimental farm (Denmark). Irrigation experiments were performed in the 1st and the 3rd year of pasture, with or without slurry application or grazing, and in winter rye. Each plot was irrigated during an hour with 18.5 mm... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions; Biodiversity and ecosystem services. |
| Ano: 2012 |
URL: http://orgprints.org/20673/4/20673.pdf |
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| Krogh, P.H.; Lamandé, M.; Eriksen, Jørgen; Holmstrup, Martin. |
| Earthworms have long been recognized for their soil engineering capacities. Since the creation of the ecosystem service concept the utilitarian perception of nature has gained a lot of attention and funding for research. Hence, we selected earthworms and their burrowing activities to enable an assessment of their influence on water movement and nutrient release. The study went on in autumn where earthworm population densities and their burrowing activities were quantified in plots of third year clover-grass crops differing in fertilisation and the manner of removing the biomass either by grazing or cutting. We found very high biomasses as expected for clover-grass about 200 g wet earthworm weight m-2. The common earthworm association typical to our region... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil biology; Biodiversity and ecosystem services; Farm nutrient management. |
| Ano: 2001 |
URL: http://orgprints.org/20690/9/20690b.pdf |
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| Registros recuperados: 10 | |
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