Fertilization effects on soil organic matter turnover and corn residue C storage

摘要: Soil organic matter turnover is influenced by N ; thus long-term fertilization of corn (Zea mays L.) may significantly affect soil levels. Effects on and storage residue C under continuous were evaluated using soils from a field experiment in Ontario. Total natural 13 abundance measurements indicated that fertilized had more than unfertilized soils, the difference accounted for 4 -derived soils. About 22 to 30% plow layer turned over was derived only 15 20% corn. Assuming follows first-order kinetics, half-life 3 surface 10 cm both same, about 19 yr. Natural estimates model indicate added retained soil. Fertilized light fraction (LF) More 70% LF 41% The shorter These results adequate increases crop yields, turn leading greater storage, does not alter rate native matter.