NDLI: Influences of drip and flood irrigation on soil carbon dioxide emission and soil carbon sequestration of maize cropland in the North China Plain

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Journal of Arid Land : Volume 9, Issue 1, February 2017

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Influences of drip and flood irrigation on soil carbon dioxide emission and soil carbon sequestration of maize cropland in the North China Plain

Content Provider	Springer Nature Link
Author	Peng, Qin Yan, Zhongqing Guo, Shufang Dong, Yunshe Wang, Liqin He, Yunlong Qi, Yuchun
Copyright Year	2017
Abstract	The need is pressing to investigate soil CO$_{2}$ (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 CO$_{2}$ emissions during the summer maize growing season in the North China Plain using the static closed chamber method. The mean CO$_{2}$ efflux over the growing season was larger under DI than that under FI. The cumulative CO$_{2}$ emissions at the field scale were 1959.10 and 1759.12 g/m$^{2}$ under DI and FI, respectively. The cumulative CO$_{2}$ emission on plant rows (OR) was larger than that between plant rows (BR) under FI, and the cumulative CO$_{2}$ emission on the irrigation pipes (OP) was larger than that between irrigation pipes (BP) under DI. The cumulative CO$_{2}$ 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 CO$_{2}$ emissions of OP under DI was larger than that of OR under FI. A general conclusion drawn from this study is that soil CO$_{2}$ 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 CO$_{2}$ emissions and DI needs to be combined with other management practices to reduce the CO$_{2}$ emissions from summer maize fields in the North China Plain.
Starting Page	222
Ending Page	233
Page Count	12
File Format	PDF
ISSN	16746767
Journal	Journal of Arid Land
Volume Number	9
Issue Number	2
e-ISSN	21947783
Language	English
Publisher	Science Press
Publisher Date	2017-03-02
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	flood irrigation carbon dioxide Sustainable Development Physical Geography soil organic carbon drip irrigation spatio-temporal variation North China Plain Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Water Science and Technology Management, Monitoring, Policy and Law

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