Fallow associated with autumn-plough favors structure stability and storage of soil organic carbon compared to continuous maize cropping in Mollisols
journal contributionposted on 2021-01-06, 05:13 authored by S Miao, Y Qiao, P Li, X Han, Caixian TangCaixian Tang
© 2017, Springer International Publishing Switzerland. Background and aims: Aggregate formation and stability of soil organic carbon (SOC) differ in different farming systems, probably due to differences in effects of tillage and residue management. This study used a 24-year field experiment to compare the effects of continuous maize cropping and natural fallow on aggregate formation and SOC storage in various aggregate-size classes and density fractions of a Chinese Mollisol. Methods: Soils collected from the upper 0.2-m layer were wet-sieved into four aggregate-size classes (>2, 0.25–2, 0.053–0.25 and <0.053 mm) which were then fractionated into light, occluded and mineral C fractions. The concentrations of SOC and natural 13C abundance of each fraction in bulk soil and the aggregate classes were determined. Results: Continuous maize cropping decreased the proportion of macro-aggregates (>0.25 mm) and increased that of micro-aggregates (<0.25 mm) compared to the initial value while the opposite was observed in the natural fallow system. The fallow system generally had greater SOC concentration in the occluded fraction, higher proportion of newly-derived C as % total SOC in the light fraction and greater contribution of total residue C to new C in macro-aggregates and light fractions compared to the continuous maize system. Furthermore, the fallow system resulted in shorter turnover time of SOC than the continuous maize system. Conclusions: Natural fallow associated with autumn-plough improved soil structural stability and SOC storage while continuous maize cropping with residue removal decreased SOC sequestration and soil aggregate stability.
JournalPlant and Soil
Pagination12p. (p. 27-38)
Rights StatementThe Author reserves all moral rights over the deposited text and must be credited if any re-use occurs. Documents deposited in OPAL are the Open Access versions of outputs published elsewhere. Changes resulting from the publishing process may therefore not be reflected in this document. The final published version may be obtained via the publisher’s DOI. Please note that additional copyright and access restrictions may apply to the published version.
Science & TechnologyLife Sciences & BiomedicineAgronomyPlant SciencesSoil ScienceAgricultureAggregationDensity fractiondelta C-13Cropping systemCarbon turnoverAGGREGATE-SIZE CLASSESDENSITY FRACTIONSMATTER FRACTIONSPARTICLE-SIZENATURAL C-13SILTY SOILSGRASSLANDTURNOVERLANDDECOMPOSITIONAgronomy & Agriculture