Effects of different no-tillage modes on soil CO2 fluxes from paddy fields in central China

Abstract

Differences in soil CO 2 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 CO 2 emissions. Therefore, a field experiment was conducted to assess paddy soil CO 2 flux as affected by different NT modes [ridge cultivation with NT (RNT) and conventional flat cultivation with NT (FNT)] and its influencing factors during the 2012-2014 rice growing seasons in central China. Soil CO 2 fluxes were determined by a LI-8100A soil CO 2 flux system. The mean soil CO 2 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 CO 2 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 CO 2 its emissions were significantly correlated with dissolved organic C, aboveground biomass and root biomass. Therefore, our results suggesting that annual rice-fallowoilseed rape rotation should be considered to assess the effects of tillage systems on soil CO 2 emission.

Comparison of Carbon Dioxide (CO2) Fluxes between Conventional and Conserved Irrigated Rice Paddy Fields in Myanmar

“…The results of our experiment revealed that fresh biomass from the Conv practice was higher than that from Cons practice, and the soil CO 2 fluxes released by Conv practice were also always higher than those produced by Cons practice for both day and night measurements. The peak CO 2 fluxes in soil from the Conv practice observed during flowering (FL) and grain filling (GF) stages (Figure 6) were likely due to increased substrates derived from root exudation and microbial decomposition of the remaining residues from previous crops [72] and photosynthates translocated from the aboveground biomass [73].…”

Influence of artificial grassland restoration on soil carbon pool in an arid mining land

“…Depleted SOC pools in reclaimed mine soil ecosystems could be identified according to comparing the SOC level to undisturbed or otherwise similar soils. SOC could be restored through appropriate land use and adoption of scientifically recommended management practices (Guo et al, 2015;Merino et al, 2015;Wu et al, 2016a;2016b). In order to accurately estimate C storage in soil, both organic and inorganic pools must be considered (Liu et al, 2016).…”