Abstract
Quantifying carbon sequestration in paddy soil is necessary to understand the effect of agricultural practices on carbon cycles. The objective of this study was to assess the effect of organic fertilizer addition (MF) on the soil respiration and net ecosystem carbon dioxide (CO2) absorption of paddy fields under water-saving irrigation (CI) in the Taihu Lake Region of China during the 2014 and 2015 rice-growing seasons. Compared with the traditional fertilizer and water management (FC), the joint regulation of CI and MF (CM) significantly increased the rice yields and irrigation water use efficiencies of paddy fields by 4.02~5.08 and 83.54~109.97% (p < 0.05). The effects of organic fertilizer addition on soil respiration and net ecosystem CO2 absorption rates showed inter-annual differences. CM paddy fields showed a higher soil respiration and net CO2 absorption rates during some periods of the rice growth stage in the first year and during most periods of the rice growth stage in the second year. These fields also had significantly higher total CO2 emission through soil respiration (total Rsoil) and total net CO2 absorption compared with FC paddy fields (p < 0.05). The total Rsoil and net ecosystem CO2 absorption of CM paddy fields were 67.39~91.55 and 129.41~113.75 mol m−2, which were 27.66~135.52 and 12.96~31.66% higher than those of FC paddy fields. The interaction between water and fertilizer management had significant effects on total net ecosystem CO2 absorption. The frequent alternate wet–dry cycles of CI paddy fields increased the soil respiration and reduced the net CO2 absorption. Organic fertilizer promoted the soil respiration of paddy soil but also increased its net CO2 absorption and organic carbon content. Therefore, the joint regulation of water-saving irrigation and organic fertilizer is an effective measure for maintaining yield, increasing irrigation water use efficiency, mitigating CO2 emission, and promoting paddy soil fertility.
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This research was financially supported by the National Natural Science Foundation of China (No. 51579070), the Fundamental Research Funds for the Central Universities (No. 2014B17114, 2015B34514), the Advanced Science and Technology Innovation Team in Colleges and Universities in Jiangsu Province, and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Yang, S., Xiao, Y. & Xu, J. Organic fertilizer application increases the soil respiration and net ecosystem carbon dioxide absorption of paddy fields under water-saving irrigation. Environ Sci Pollut Res 25, 9958–9968 (2018). https://doi.org/10.1007/s11356-018-1285-y
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DOI: https://doi.org/10.1007/s11356-018-1285-y