Institut für Bodenkunde und Standortslehre

Permanent URI for this collectionhttps://hohpublica.uni-hohenheim.de/handle/123456789/10

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Correction to “The stonesphere in agricultural soils: a microhabitat associated with rock fragments bridging rock and soil”
(2025) Dittrich, Felix; Klaes, Björn; Brandt, Luise; Groschopf, Nora; Thiele‐Bruhn, Sören
Release of glucose from dissolved and mineral‐bound organic matter by enzymatic hydrolysis
(2023) Lenhardt, Katharina R.; Brandt, Luise; Poll, Christian; Rennert, Thilo; Kandeler, Ellen
Sorption of dissolved organic matter (DOM) by poorly crystalline minerals during their formation may protect large amounts of carbon in soils from mineralization. We investigated the bioavailability of carbohydrates in DOM and after co-precipitation with short-range ordered aluminosilicates. Carbohydrates originated from soil solutions collected in situ at two depths of a Dystric Cambisol, and from litter extracts. Quantification of substrate-specific degradability was achieved by the addition of β-glucosidase at an optimal concentration and subsequent determination of glucose release. Depending on DOM composition, 0.6–41.4 mg g−1 C−1 of glucose was enzymatically released from dissolved carbohydrates. Co-precipitated carbohydrates were partially accessible, resulting in a glucose release of 0.7–5.2 mg g−1 C−1. Restricted enzymatic depolymerization due to co-precipitation may contribute to accumulation of easily degradable substrates in soils.
The stonesphere in agricultural soils: a microhabitat associated with rock fragments bridging rock and soil
(2024) Dittrich, Felix; Klaes, Björn; Brandt, Luise; Groschopf, Nora; Thiele‐Bruhn, Sören
Rock fragments (RFs) are abundant soil constituents, but are routinely excluded from soil analyses. Hence, their contribution to soil properties, and in particular to the microbiome, is incompletely understood. Therefore, shifts in microbial colonisation along the rock‐to‐soil continuum of topsoils from three agricultural sites with different sedimentary parent rock materials were investigated with particular attention to RFs. Microbial biomass and community composition were quantified using phospholipid fatty acid (PLFA) analysis for unweathered and weathered parent rock materials, two RF fractions (8–16 mm and 2–8 mm) and the fine earth (FE; <2 mm). Trends in biogeochemical weathering, nutrient availability and soil organic matter (OM) development were assessed using mineralogical, geochemical and physical analyses. Actinobacterial PLFA was particularly abundant in parent rocks, where Actinobacteria likely contribute to rock weathering and the initiation of OM accumulation. Conversely, bacterial PLFAs were most abundant in the FE under nutrient‐ and OM‐rich conditions. The integral role of RFs as a microbial habitat is demonstrated by a distinct fungal colonisation, which is enabled by the specific physical features of RFs in combination with the provision of inorganic nutrients. Our findings indicate that RFs are colonised by microbes and that differences in the community structure depend on mineralogical properties and chemical weathering status. We document that RFs are microhabitats with a significant potential to host microbial life in cultivated soils, and thus, could play an important role in biogeochemical cycling and the provision of soil functions in agroecosystems.

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