Effects of tillage and nitrogen fertilizers on CH4 and CO2 emissions and soil organic carbon in paddy fields of central China.

PloS One
Li Cheng-FangCao Cou-Gui

Abstract

Quantifying carbon (C) sequestration in paddy soils is necessary to help better understand the effect of agricultural practices on the C cycle. The objective of the present study was to assess the effects of tillage practices [conventional tillage (CT) and no-tillage (NT)] and the application of nitrogen (N) fertilizer (0 and 210 kg N ha(-1)) on fluxes of CH(4) and CO(2), and soil organic C (SOC) sequestration during the 2009 and 2010 rice growing seasons in central China. Application of N fertilizer significantly increased CH(4) emissions by 13%-66% and SOC by 21%-94% irrespective of soil sampling depths, but had no effect on CO(2) emissions in either year. Tillage significantly affected CH(4) and CO(2) emissions, where NT significantly decreased CH(4) emissions by 10%-36% but increased CO(2) emissions by 22%-40% in both years. The effects of tillage on the SOC varied with the depth of soil sampling. NT significantly increased the SOC by 7%-48% in the 0-5 cm layer compared with CT. However, there was no significant difference in the SOC between NT and CT across the entire 0-20 cm layer. Hence, our results suggest that the potential of SOC sequestration in NT paddy fields may be overestimated in central China if only surface so...Continue Reading

References

Aug 24, 2000·Journal of Agricultural and Food Chemistry·R A YokleyM W Cheung
Oct 30, 2007·Journal of Environmental Quality·S A KhanC W Boast
Apr 23, 2008·Archives of Environmental Contamination and Toxicology·Chengfang LiShahrear Ahmad

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Citations

Mar 12, 2016·Environmental Pollution·Yan ChenXiangli Tian
Oct 31, 2014·Environmental Science and Pollution Research International·Saddam HussainLixiao Nie
Apr 16, 2015·PloS One·Li-Chao FanWen-Yan Han

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