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Krause, Lars ; Rodionov, Andrei ; Schweizer, Steffen A. ; Siebers, Nina ; Lehndorff, Eva ; Klumpp, Erwin ; Amelung, Wulf:
Microaggregate stability and storage of organic carbon is affected by clay content in arable Luvisols.
In: Soil & Tillage Research.
Bd. 182
(2018)
.
- S. 123-129.
ISSN 0167-1987
DOI: https://doi.org/10.1016/j.still.2018.05.003
Abstract
As soil microaggregates (250 μm) were dispersed ultrasonically to study occluded SMA and single building units. Finally, we analyzed the size distribution of the small SMA by laser diffraction analysis. The total mass distribution of free and occluded SMA grouped soils into those with small (19, 22, and 24%) and large (32 and 34%) clay contents. The finer textured soils exhibited larger portions of occluded SMA, with a gamma size distribution of small SMA peaking at 6 μm. Yet the occluded small SMA in the finer textured soils showed an additional enrichment of colloids <1 μm. The SOC was indeed enriched in finer fractions, but more in the small SMA of the coarse textured sites than in the finer textured ones, whereas the opposite was true for the large SMA. We conclude, therefore, that elevated contents of clay-sized particles promote SMA formation and stabilization, therewith shifting SOC enrichment from small to larger SMA.