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Leuther, Frederic ; Fischer, Dorte ; Nunan, Naoise ; Meurer, Katharina H. E. ; Herrmann, Anke M.:
Soil structural indicators as predictors of biological activity under various soil management practices.
In: Geoderma.
Bd. 457
(2025)
.
- 117290.
ISSN 0016-7061
DOI: https://doi.org/10.1016/j.geoderma.2025.117290
Abstract
Soil structure is a key feature in controlling the turnover of organic matter in soils. The spatial arrangement of
solids and pores in agricultural topsoil can be actively influenced by management practices, such as tillage and
cropping systems, which in turn can affect the resident microbial communities and their activities. However,
carbon mineralisation and microbial activity are usually measured in sieved samples, which provides information
on gross potentials under optimal conditions. Under these conditions, the spatial heterogeneities that are
specific to different management practices are reduced or totally removed. In this study, we combined X-ray
computer tomography (X-ray CT) and isothermal calorimetry to investigate the effect of soil structure on heat
dissipation, as an indicator of biological activity. Samples were collected from the topsoil of a long-term field
experiment (12 years) that included four different land uses: conventional vs. reduced tillage, each with either
maize or winter wheat as the main crop in the rotation. We compared the response of undisturbed soil cores (3
cm in height, 2.7 cm in diameter) to the addition of water and glucose in specific pore sizes, ranging in radii of 15
to 75 μm or 3 to 75 μm. The pore structure and indicators of particulate organic material were quantified using Xray
CT with a voxel resolution of 15 μm. This allowed us to distinguish between the effects of crop rotation and
tillage regime on biological activity, soil structure and the feedback between the two. Heat dissipation correlated
significantly with X-ray CT derived porosity, pore surface density and soil matrix grey value, all of which were
affected by both tillage regime and crop rotation. Heat dissipation in maize plots after glucose addition to the
pore size range with radii of 3 to 75 μm was greater than in the winter wheat systems, but not when added to the
pore size range with radii of 15 to 75 μm. The study showed that structural indicators can explain up to 81 % and
95 % of the variance in total heat dissipation after glucose and water addition, respectively, but only 60 % of the
heat dynamics, here defined as the time taken for 50 % of total heat to be dissipated. The results emphasise the
importance of soil structure in regulating microbial decomposition of soil organic matter and warrants further
investigations.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenphysik Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenphysik > Lehrstuhl Bodenphysik - Univ.-Prof. Dr. Efstathios Diamantopoulos |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie 500 Naturwissenschaften und Mathematik > 570 Biowissenschaften; Biologie |
| Eingestellt am: | 16 Apr 2025 07:32 |
| Letzte Änderung: | 16 Apr 2025 07:32 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/93310 |