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Journal of Arid Land
Journal of Arid Land  2017, Vol. 9 Issue (2): 222-233    DOI: 10.1007/s40333-017-0011-9
Research Article     
Influences of drip and flood irrigation on soil carbon dioxide emission and soil carbon sequestration of maize cropland in the North China Plain
Shufang GUO, Yuchun QI, Qin PENG, Yunshe DONG*(), Yunlong HE, Zhongqing YAN, Liqin WANG
Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing100101, China
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Abstract  

The need is pressing to investigate soil CO2(carbon dioxide)emissions and soil organic carbon dynamics under water-saving irrigation practices in agricultural systems for exploring the potentials of soil carbon sequestration. A field experiment was conducted to compare the influences of drip irrigation (DI) and flood irrigation (FI) on soil organic carbon dynamics and the spatial and temporal variations in CO2 emissions during the summer maize growing season in the North China Plain using the static closed chamber method. The mean CO2 efflux over the growing season was larger under DIthan that under FI. The cumulative CO2 emissions at the field scalewere 1959.10 and 1759.12 g/m2 under DI and FI, respectively. The cumulative CO2 emission onplant rows (OR) was larger than that between plant rows (BR) under FI, and the cumulative CO2 emission on the irrigationpipes (OP) was larger than that between irrigationpipes (BP) under DI. The cumulative CO2 emissions of OP, BP and bare area (BA) under DI were larger than those of OR, BR and BA under FI, respectively. Additionally, DI promoted root respiration more effectively than FI did. The average proportion of root respiration contributing to the soil CO2 emissions of OP under DI was larger than that of OR under FI. A general conclusion drawn from this study is that soil CO2 emission was significantly influenced by the soil water content, soil temperature and air temperature under both DI and FI. Larger concentrations of dissolved organic carbon (DOC), microbial biomass carbon (MBC) and total organic carbon (TOC) were observed under FI than those under DI. The observed high concentrations (DOC, MBC, and TOC) under FI might be resulted from the irrigation-associated soil saturation that in turn inhibited microbial activity and lowered decomposition rate of soil organic matter. However, DI increased the soil organic matter quality (the ratio of MBC to TOC) at the depth of 10-20 cm compared with FI. Our results suggest that the transformation from conventional FI to integrated DI can increase the CO2 emissions and DI needs to be combined with other management practices to reduce the CO2 emissions from summer maize fields in the North China Plain.

Key words： drip irrigation      flood irrigation      spatio-temporal variation      carbon dioxide      soil organic carbon      North China Plain     
Received: 14 December 2015      Published: 20 April 2017
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Shufang GUO
Yuchun QI
Qin PENG
Yunshe DONG
Yunlong HE
Zhongqing YAN
Liqin WANG
Cite this article:

Shufang GUO, Yuchun QI, Qin PENG, Yunshe DONG, Yunlong HE, Zhongqing YAN, Liqin WANG. Influences of drip and flood irrigation on soil carbon dioxide emission and soil carbon sequestration of maize cropland in the North China Plain. Journal of Arid Land, 2017, 9(2): 222-233.

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http://jal.xjegi.com/10.1007/s40333-017-0011-9     OR     http://jal.xjegi.com/Y2017/V9/I2/222

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