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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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| 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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| 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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