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Journal of soil science and plant nutrition

versión On-line ISSN 0718-9516

Resumen

GUO, L.J et al. Effects of different no-tillage modes on soil CO2 fluxes from paddy fields in central China. J. Soil Sci. Plant Nutr. [online]. 2015, vol.15, n.3, pp.737-750. ISSN 0718-9516.  http://dx.doi.org/10.4067/S0718-95162015005000050.

Differences in soil CO2 emissions between no-tillage (NT) and conventional intensive tillage have been well assessed in paddy fields, but few studies evaluate the effects of different NT modes on soil CO2 emissions. Therefore, a field experiment was conducted to assess paddy soil CO2 flux as affected by different NT modes ENT#091;ridge cultivation with NT (RNT) and conventional flat cultivation with NT (FNT)ENT#093; and its influencing factors during the 2012-2014 rice growing seasons in central China. Soil CO2 fluxes were determined by a LI-8100A soil CO2 flux system. The mean soil CO2 fluxes on the ridges in the RNT treatment increased by 49%, 52% and 35% compared with those on the flat land in the FNT treatment in 2012, 2013 and 2014, respectively. Cumulative CO2 its emissions ranged from 1042 g m-2 to 1489 g m-2 from the RNT treatment, and from 724 g m-2 to 1016 g m-2 for the FNT treatment. Moreover, soil CO2 emissions were significantly correlated with dissolved organic C, aboveground biomass and root biomass. Therefore, our results suggesting that annual rice-fallow-oilseed rape rotation should be considered to assess the effects of tillage systems on soil CO2 emission.

Palabras clave : Biomass; CO2 flux; dissolved organic C; no-tillage; ridge tillage.

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