Effects of Tillage and Nitrogen Fertilizers on CH4 and CO2 Emissions and Soil Organic Carbon in Paddy Fields of Central China
文献类型： 外文期刊
作者： Li Cheng-Fang 1 ; Zhou Dan-Na 2 ; Kou Zhi-Kui 1 ; Zhang Zhi-Sheng 1 ; Wang Jin-Ping 1 ; Cai Ming-Li 1 ; Cao Cou-Gui 1 ;
作者机构： 1.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan, Hubei, Peoples R China
2.Hubei Acad Agr Sci, Inst Anim Husb & Vet Sci, Wuhan, Hubei, Peoples R China
期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）
ISSN： 1932-6203
年卷期： 2012 年 7 卷 5 期
页码：
收录情况： SCI
摘要： 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 CH4 and CO2, and soil organic C (SOC) sequestration during the 2009 and 2010 rice growing seasons in central China. Application of N fertilizer significantly increased CH4 emissions by 13%-66% and SOC by 21%-94% irrespective of soil sampling depths, but had no effect on CO2 emissions in either year. Tillage significantly affected CH4 and CO2 emissions, where NT significantly decreased CH4 emissions by 10%-36% but increased CO2 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 soil samples are considered.
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