Zero tillage management of agricultural soils has potential for enhancing soil carbon (C) storage and
reducing greenhouse gas emissions. However, the mechanisms which control carbon (C) sequestration in
soil in response to zero tillage are not well understood. The aim of this study was to investigate the links
between zero tillage practices and the functioning of the soil microbial community with regards to C
cycling, testing the hypothesis that zero tillage enhances biological functioning in soil with positive
implications for C sequestration. Specifically, we determined microbial respiration rates, enzyme activities,
carbon source utilization and the functional chemistry of the soil organic matter in temperate well
drained soils that had been zero tilled for seven years against annually tilled soils. Zero tilled soils
contained 9% more soil C, 30% higher microbial biomass C than tilled soil and an increased presence of
aromatic functional groups indicating greater preservation of recalcitrant C. Greater CO2 emission and
higher respirational quotients were observed from tilled soils compared to zero tilled soils while microbial
biomass was 30% greater in zero tilled soils indicating a more efficient functioning of the microbial
community under zero tillage practice. Furthermore, microbial enzyme activities of
dehydrogenase, cellulase, xylanase, b-glucosidase, phenol oxidase and peroxidase were higher in zero
tilled soils. Considering zero tillage enhanced both microbial functioning and C storage in soil, we suggest
that it offers significant promise to improve soil health and support mitigation measures against climate
change.
Zero tillage management of agricultural soils has potential for enhancing soil carbon (C) storage andreducing greenhouse gas emissions. However, the mechanisms which control carbon (C) sequestration insoil in response to zero tillage are not well understood. The aim of this study was to investigate the linksbetween zero tillage practices and the functioning of the soil microbial community with regards to Ccycling, testing the hypothesis that zero tillage enhances biological functioning in soil with positiveimplications for C sequestration. Specifically, we determined microbial respiration rates, enzyme activities,carbon source utilization and the functional chemistry of the soil organic matter in temperate welldrained soils that had been zero tilled for seven years against annually tilled soils. Zero tilled soilscontained 9% more soil C, 30% higher microbial biomass C than tilled soil and an increased presence ofaromatic functional groups indicating greater preservation of recalcitrant C. Greater CO2 emission andhigher respirational quotients were observed from tilled soils compared to zero tilled soils while microbialbiomass was 30% greater in zero tilled soils indicating a more efficient functioning of the microbialcommunity under zero tillage practice. Furthermore, microbial enzyme activities ofdehydrogenase, cellulase, xylanase, b-glucosidase, phenol oxidase and peroxidase were higher in zeroดินเนื้อปูน tilled พิจารณา tillage ศูนย์เพิ่มทำจุลินทรีย์และ C เก็บในดิน เราขอแนะนำว่า มันมีสัญญาสำคัญเพื่อปรับปรุงดินสุขภาพและสนับสนุนการลดปัญหามาตรการกับสภาพภูมิอากาศเปลี่ยนแปลง
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