Tillage and crop residue management methods had minor effects on the stock and stabilization of topsoil carbon in a 30-year field experiment

The Science of the Total Environment
Pooja SinghKristiina Regina

Abstract

We studied the effects of tillage and straw management on soil aggregation and soil carbon sequestration in a 30-year split-plot experiment on clay soil in southern Finland. The experimental plots were under conventional or reduced tillage with straw retained, removed or burnt. Wet sieving was done to study organic carbon and soil composition divided in four fractions: 1) large macroaggregates, 2) small macroaggregates, 3) microaggregates and 4) silt and clay. To further estimate the stability of carbon in the soil, coarse particulate organic matter, microaggregates and silt and clay were isolated from the macroaggregates. Total carbon stock in the topsoil (equivalent to 200 kg m(-2)) was slightly lower under reduced tillage (5.0 kg m(-2)) than under conventional tillage (5.2 kg m(-2)). Reduced tillage changed the soil composition by increasing the percentage of macroaggregates and decreasing the percentage of microaggregates. There was no evidence of differences in the composition of the macroaggregates or carbon content in the macroaggregate-occluded fractions. However, due to the higher total amount of macroaggregates in the soil, more carbon was bound to the macroaggregate-occluded microaggregates in reduced tillage. Compar...Continue Reading

References

Jun 20, 2012·BMC Neuroscience·Viola KretschmerJosef Ammermüller
Mar 19, 2013·Global Change Biology·Jaakko HeikkinenKristiina Regina

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Citations

Nov 19, 2015·Frontiers in Plant Science·Ken E GillerBernard Vanlauwe
Nov 17, 2020·Frontiers in Microbiology·Ansa PalojärviLaura Alakukku
Apr 2, 2021·The Science of the Total Environment·Maria HolmbergMartin Forsius
Jun 25, 2021·Journal of Environmental Management·Bekele LemmaKeith Paustian
Aug 23, 2021·Environmental Science and Pollution Research International·Yayi NiuYulong Duan

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