Process sequence of soil aggregate formation disentangled through multi-isotope labelling
| Autor: | Wulf Amelung, Nele Meyer, Andrey Rodionov, Claudia Knief, Michaela Aehnelt, Sara L. Bauke, Biesgen Danh, Stefan Dultz, Georg Guggenberger, Maguy Jaber, Erwin Klumpp, Ingrid Kögel-Knabner, Volker Nischwitz, Steffen A. Schweizer, Bei Wu, Kai Uwe Totsche, Eva Lehndorff |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften
Clay minerals Aggregate formation Dewey Decimal Classification::900 | Geschichte und Geografie::910 | Geografie Reisen ddc:550 Soil Science Organo-mineral interactions Iron oxides Extracellular polymeric substances ddc:910 Stable isotopes |
| Zdroj: | Geoderma : an international journal of soil science 429 (2023) Geoderma : an international journal of soil science Geoderma 429, 116226-(2023). doi:10.1016/j.geoderma.2022.116226 |
| DOI: | 10.1016/j.geoderma.2022.116226 |
| Popis: | Microaggregates (250 µm) that resisted 60 J mL−1 ultrasonic dispersion. Afterwards, we assessed the C, N, Fe, and Si stable isotope composition in each size fraction. After four weeks we found a rapid build-up of stable macroaggregates comprising almost 50 % of soil mass in the treatment with plants and respective soil rooting, but only 5 % when plants were absent. The formation of these stable macroaggregates proceeded with time. Soil organic carbon (SOC) contents were elevated by 15 % in the large macroaggregates induced by plant growth. However, the recovery of EPS-derived 13C was below 20 % after 4 weeks, indicating rapid turnover in treatments both with and without plants. The remaining EPS-derived C was mainly found in macroaggregates when plants were present and in the occluded small microaggregates ( |
| Databáze: | OpenAIRE |
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