Tracking C and N dynamics and stabilization in soil amended with wheat residue and its corresponding bioethanol by‐product: a 13C/15N study

摘要: Removing agricultural cellulosic residues from fields for the production of ‘second generation biofuels'has potential to profoundly alter C and N cycling in soil, increasing risk soil organic matter depletion favoring soil–atmosphere gaseous exchanges. However, these negative impacts could potentially be offset by amending with solid by-product which is generated during bioethanol production. In a 100 days laboratory study, we investigated fate after amendment doubly labeled (13C, 15N) wheat residue (WR) corresponding (i.e. nonfermentable NFWR) without extra addition. Substituting WR amount recovered partially compensated losses full crop removal. When equivalent was added as NFWR, NFWR-derived found significantly higher proportion macroaggregates (17.0 vs. 8.9%) days. Addition both NFWR reduced (SOC) mineralization, i.e. it caused priming effect soil. this pattern reversed when added. Both increased water-stable 16% (in control) 20–24% different treatments). The results suggest that more recalcitrant compounds derived may stabilize strongly persist within protected fractions SOM pools. Our study demonstrates compared application, neither N2O emissions nor had impact on aggregate formation midterm. This has replenishing SOC stocks