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| Registros recuperados: 11 | |
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| Rennert, Thilo; Höschen, Carmen; Rogge, Derek; Steffens, Markus. |
| Rationale: In contaminated soil, copper (Cu) is commonly distributed among various very small particles. To enlighten the qualitative distribution of Cu in a contaminated Technosol (a soil developed from deposited technogenic material) on the sub‐micron scale, we used nano‐scale secondary ion mass spectrometry (NanoSIMS). Methods: We studied seven areas (up to 40 μm × 40 μm) on a thin section of a soil horizon by NanoSIMS, measuring 12C−, 18O−, 32S−, 63Cu− and 56Fe16O−. We evaluated the NanoSIMS measurements with a novel digital image processing tool to enlighten the composition of measured areas and thus the distribution of Cu at the sub‐micron scale. Image processing comprised spatial and spectral smoothing, normalization, endmember extraction and... |
| Tipo: Journal paper |
Palavras-chave: Soil quality; Environmental aspects. |
| Ano: 2018 |
URL: http://orgprints.org/33265/1/rennert-etal-2018-RapidComMassSpetrum-Vol32-issue11-p851-861.pdf |
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| Steffens, Markus; Rogge, Derek; Höschen, Carmen; Lugmeier, Johan; Mueller, Carsten W.; Kögel-Knabner, Ingrid. |
| Soil aggregation is a key factor for a number of important biogeochemical processes (e.g. soil organic matter stabilization and nutrient and pollutant sorption) in soils. Although there is a large number of studies on the factors controlling such soil processes, it is still challenging to study these processes in-situ. However, it can be assumedthat the spatial arrangement of organic and mineral soil constituents in soil aggregates, and thus the aggregate structure determine the processes happening at the aggregate scale. Using nanoscale secondary ion mass spectroscopy and a novel digital image processing approach, we extensively analyzed the spatial distribution of ions characteristic for mineral and organic soil components on the micrometer-scale in an... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality. |
| Ano: 2018 |
URL: http://orgprints.org/34931/1/steffens-etal-2018-EGU2018-Vol20-11614.pdf |
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| Müller, Adrian; Meier, Matthias; Schader, Christian; Gattinger, Andreas; Steffens, Markus. |
| There is a large and growing body of literature comparing the environmental performance of organic and conventional farming in specific settings, either on farm or product level. However, how one assesses ‘environmental performance’ is a complex and multifaceted question, and one-dimensional indicators tend to neglect key aspects of production systems. This chapter evaluates a number of multidimensional methods of assessment, including Life Cycle Assessment, Productivity Analysis, multi-criteria assessment approaches and food systems modelling. It is concluded that the assessment of environmental performance must go beyond the level of production, and address consistency and sufficiency aspects that emerge at the consumption stage. The organic sector has a... |
| Tipo: Book chapter |
Palavras-chave: "Organics" in general; Environmental aspects; Knowledge management. |
| Ano: 2018 |
URL: http://orgprints.org/34335/1/MullerEtAl_2018_EditorKoepke_burleighdodds_chapter14.pdf |
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| Leifeld, Jens; Alewell, Christine; Bader, Cédric; Krüger, Jan Paul; Mueller, Carsten W.; Sommer, Michael; Steffens, Markus; Szidat, Sönke. |
| Pyrogenic carbon (PyC) derives from incomplete combustion of organic matter and is ubiquitous in terrestrial and aquatic systems. Most PyC is inherently more stable against decomposition than plant residues, and PyC therefore forms an important component of the global carbon (C) cycle. During the Holocene, about 436 Pg organic C accumulated in northern peatlands, and we hypothesize that PyC may contribute substantially to that C stock. We studied 70 samples from 19 intact and degraded European peatland sites and analyzed their PyC content by 13C nuclear magnetic resonance spectroscopy and molecular modeling and peat age and accumulation by radiocarbon dating. Classification of a peatland as either intact or degraded was based on the comparison between... |
| Tipo: Journal paper |
Palavras-chave: Soil. |
| Ano: 2018 |
URL: http://orgprints.org/34486/1/leifeldetal-2018-LandDegradDevelop-Vol29-p2082%E2%80%932091.pdf |
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| Steffens, Markus; Rogge, Derek M.; Mueller, Carsten W.; Höschen, Carmen; Lugmeier, Johann; Kölbl, Angelika; Kögel-Knabner, Ingrid. |
| The physical, chemical, and biological processes forming the backbone of important soil functions (e.g., carbon sequestration, nutrient and contaminant storage, and water transport) take place at reactive interfaces of soil particles and pores. The accessibility of these interfaces is determined by the spatial arrangement of the solid mineral and organic soil components, and the resulting pore system. Despite the development and application of novel imaging techniques operating at the micrometer and even nanometer scale, the microstructure of soils is still considered as a random arrangement of mineral and organic components. Using nanoscale secondary ion mass spectroscopy (NanoSIMS) and a novel digital image processing routine adapted from remote sensing... |
| Tipo: Journal paper |
Palavras-chave: Soil quality. |
| Ano: 2017 |
URL: http://orgprints.org/33262/1/steffens-etal-2017-EnvSci_Tech-Vol51-issue21-p12182-12189.pdf |
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| Pihlap, Evelin; Vuko, Miljenka; Lucas, Maik; Steffens, Markus; Schloter, Michael; Vetterlein, Doris; Endenich, Manuel; Kögel-Knabner, Ingrid. |
| After reclamation of open-cast mining pits, soil formation starts from the deposited calcareous loess characterised by its basic physical and chemical properties whereas soil biology and structure need to develop to achieve a fully functional soil. In this study we used a chronosequence approach to elucidate soil formation on agriculturally reclaimed loess soils in an open-cast lignite mining area in Garzweiler (Germany). We selected six fields aged 0, 1, 3, 6, 12, and 24 years after the first seeding in order to observe the initial stage of development of soil properties and assess the role of management with conventional crop rotation in soil structure formation and soil organic carbon (SOC) accumulation. Loess parent material had a strong impact on... |
| Tipo: Journal paper |
Palavras-chave: Soil quality; Nutrient turnover. |
| Ano: 2019 |
URL: http://orgprints.org/35361/1/pihlap_etal_2019_soil_tillage-research-Vol191-p224-237.pdf |
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| Mayer, Stefanie; Schwindt, Daniel; Steffens, Markus; Völkel, Jörg; Kögel-Knabner, Ingrid. |
| The distribution of soil organic carbon (OC) in the landscape shows high variability between landform positions. Soils in depositional sites are characterized by a highly diverse vertical structure and can contain significant amounts of OC over the whole soil profile. However, anthropogenic modifications of the landscape such as land use and artificial drainage can significantly alter the OC balance in a catchment. Here, we analyse the spatial distribution of OC stocks along an agriculturally used catena in a catchment, tributary to the Danube River in the Bavarian Forest in Southern Germany. The combination of geomorphic aspects with highly detailed soil data based on 16 soil profiles along a catena allowed us to closely examine the relationship between... |
| Tipo: Journal paper |
Palavras-chave: Soil quality. |
| Ano: 2018 |
URL: http://orgprints.org/33264/1/mayer-etal-2018-geoderma-Vol327-p63-72.pdf |
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| Hobley, Eleanor; Steffens, Markus; Bauke, Sara L.; Kögel-Knabner, Ingrid. |
| Subsoil organic carbon (OC) is generally lower in content and more heterogeneous than topsoil OC, rendering it difficult to detect significant differences in subsoil OC storage. We tested the application of laboratory hyperspectral imaging with a variety of machine learning approaches to predict OC distribution in undisturbed soil cores. Using a bias-corrected random forest we were able to reproduce the OC distribution in the soil cores with very good to excellent model goodness-of-fit, enabling us to map the spatial distribution of OC in the soil cores at very high resolution (~53 × 53 µm). Despite a large increase in variance and reduction in OC content with increasing depth, the high resolution of the images enabled statistically powerful analysis in... |
| Tipo: Journal paper |
Palavras-chave: Soil. |
| Ano: 2018 |
URL: http://orgprints.org/34485/1/hobley-etal-2018-ScientificReports-Vol8-article13900-p1-17.pdf |
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| Näthe, Kerstin; Delphis, F. Levia; Steffens, Markus; Michalzik, Beate. |
| Wildfires change the chemical composition of soil organic matter (SOM). Since the effects of fires on organic matter (OM) in soil solution are largely unknown, we sought to compare the quality of dissolved organic matter (DOM) and total organic matter (TOM =DOM +particulate OM) between burned and control sites. The sites were subjected to a low-intensity surface fire in a coniferous forest in Germany dominated by spodic Cambisols derived from Triassic sandstone. Soil solutions from three different soil horizons (O, Ah, Bw), and throughfall (TF) were analyzed using solid state 13C NMR spectroscopy, allowing us to track the initial fire impact on OM vertically through the soil profile and 70 days after the fire. In addition, organic layer samples were... |
| Tipo: Journal paper |
Palavras-chave: Soil quality. |
| Ano: 2017 |
URL: http://orgprints.org/33263/1/naethe-etal-2017-geoderma-Vol305-p394-406.pdf |
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| Pihlap, Evelin; Steffens, Markus; Kögel-Knabner, Ingrid. |
| Soil organic matter (SOM) and organic glues from biological processes are considered to be major contributors inaggregate formation. But there is limited knowledge on soil structural formation during initial soil development –the step when SOM content is low and soil properties are mostly controlled by the parent material. In our study we used a chronosequence approach in the re-cultivated open-cast mining area near Cologne, Germany to elucidate thedevelopment of soil structure and soil organic matter during initial soil formation in a loess material. We selectedsix plots with different ages of agricultural management after re-cultivation (0, 1, 3, 6, 12, and 24 years after firstseeding). In each plot 12 spatially independent locations were sampled with... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality. |
| Ano: 2018 |
URL: http://orgprints.org/34932/1/steffens-etal-2018-EGU2018-Vol20-p1933.pdf |
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| Registros recuperados: 11 | |
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