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

摘要: Abstract We studied the effects of tillage and straw management on soil aggregation carbon sequestration in a 30-year split-plot experiment clay southern Finland. The experimental plots were under conventional or reduced with retained, removed burnt. Wet sieving was done to study organic composition divided four fractions: 1) large macroaggregates, 2) small 3) microaggregates 4) silt clay. To further estimate stability soil, coarse particulate matter, isolated from macroaggregates. Total stock topsoil (equivalent 200 kg m − 2 ) slightly lower (5.0 kg m than (5.2 kg m ). Reduced changed by increasing percentage macroaggregates decreasing microaggregates. There no evidence differences content macroaggregate-occluded fractions. However, due higher total amount more bound tillage. Compared plowed density deep burrowing earthworms ( Lumbricus terrestris considerably positively associated microbial biomass did not differ between treatments. Straw have discernible either stock. conclude that although can improve structure, generally chances increase practices appear limited cereal monoculture systems boreal region. This may be related already high C soils, precipitation level favoring decomposition aggregate turnover winter frost.