Soil carbon dynamics as affected by long-term contrasting cropping systems and tillages under semiarid Mediterranean

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24 Citazioni (Scopus)

Abstract

In a dryland Mediterranean agrosystem (Sicily, Italy) a comparative study was carried out among twocrop systems (wheat/wheat and wheat/bean) after 19 years under three most used tillage managements(conventional, dual layer and no-tillage), in order to ascertain the effects of those experimental factors,single and combined, on various soil organic C pools (total and extractable organic C, microbial biomass C,basal respiration). Field CO2 fluxes from soil, throughout a year, were also determined. Moreover, C inputand output were assessed, as well as microbial and metabolic quotients. Tillage management more thancropping system affected the soil organic C stored in the first 15 cm of soil. After 19 years, no-tillage causeda 3.6 Mg ha−1 increase of C content in wheat/faba rotation while of 5.6 Mg ha−1 in wheat monoculture.The higher soil total organic C content in wheat monoculture was ascribed to a lower quality of residuessupplied (higher both C/N ratio and acid detergent fibre (ADF) content). Moreover, wheat/bean rotationincreased soil microbial biomass C, basal respiration and microbial quotient, thus suggesting that croprotation more than tillage management was the driving factor in improving soil biochemical indicators.
Lingua originaleEnglish
pagine (da-a)140-147
Numero di pagine8
RivistaApplied Soil Ecology
Volume73
Stato di pubblicazionePublished - 2014

All Science Journal Classification (ASJC) codes

  • Ecology
  • Agricultural and Biological Sciences (miscellaneous)
  • Soil Science

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