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000845990 1001_ $$0P:(DE-Juel1)168258$$aKrause, Lars$$b0$$eCorresponding author
000845990 245__ $$aMicroaggregate stability and storage of organic carbon is affected by clay content in arable Luvisols
000845990 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2018
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000845990 520__ $$aAs soil microaggregates (<250 μm, SMA) usually withstand long-term tillage, we hypothesized that i) elevated clay contents in arable soil support aggregation already at microaggregate level, leading to ii) increasing organic carbon (SOC) enrichment in smaller SMA size fractions. To test these hypotheses we sampled the topsoil (5–20 cm) of Luvisols with a long history of agricultural management at the Scheyern experiment station (Germany) in quintuplicates from each of five subsites with different clay contents (19–34%). The field-fresh topsoil was fractionated into macroaggregates (8000–250 μm), large SMA (250–20 μm), and small SMA (<20 μm) and the mass distribution was recorded. In addition, the water stable macroaggregates (>250 μm) were dispersed ultrasonically to study occluded SMA and single building units. Finally, we analyzed the size distribution of the small SMA by laser diffraction analysis. The total mass distribution of free and occluded SMA grouped soils into those with small (19, 22, and 24%) and large (32 and 34%) clay contents. The finer textured soils exhibited larger portions of occluded SMA, with a gamma size distribution of small SMA peaking at 6 μm. Yet the occluded small SMA in the finer textured soils showed an additional enrichment of colloids <1 μm. The SOC was indeed enriched in finer fractions, but more in the small SMA of the coarse textured sites than in the finer textured ones, whereas the opposite was true for the large SMA. We conclude, therefore, that elevated contents of clay-sized particles promote SMA formation and stabilization, therewith shifting SOC enrichment from small to larger SMA.
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000845990 536__ $$0G:(GEPRIS)251268514$$aMAD Soil - MAD Soil - Microaggregates: Formation and turnover of the structural building blocks of soils (251268514)$$c251268514$$x1
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000845990 7001_ $$0P:(DE-HGF)0$$aRodionov, Andrei$$b1
000845990 7001_ $$0P:(DE-HGF)0$$aSchweizer, Steffen A.$$b2
000845990 7001_ $$0P:(DE-Juel1)164361$$aSiebers, Nina$$b3$$ufzj
000845990 7001_ $$0P:(DE-HGF)0$$aLehndorff, Eva$$b4
000845990 7001_ $$0P:(DE-Juel1)129484$$aKlumpp, Erwin$$b5$$ufzj
000845990 7001_ $$0P:(DE-Juel1)129427$$aAmelung, Wulf$$b6$$ufzj
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