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Water Salinity Should Be Reduced for Irrigation to Minimize Its Risk of Increased Soil N 2 O Emissions

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  • Qi Wei

    (State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
    College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China)

  • Junzeng Xu

    (State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
    College of Agricultural Engineering, Hohai University, Nanjing 210098, China)

  • Linxian Liao

    (College of Agricultural Engineering, Hohai University, Nanjing 210098, China)

  • Yawei Li

    (College of Agricultural Engineering, Hohai University, Nanjing 210098, China)

  • Haiyu Wang

    (College of Agricultural Engineering, Hohai University, Nanjing 210098, China)

  • Shah Fahad Rahim

    (College of Agricultural Engineering, Hohai University, Nanjing 210098, China)

Abstract

To reveal the effect of irrigation salinity on soil nitrous oxide (N 2 O) emission, pot experiments were designed with three irrigation salinity levels (NaCl and CaCl 2 of 1, 2.5 and 4 g/L equivalence, Ec = 3.6, 8.1 and 12.7 ds/m), either for 0 kg N/ha (N0) or 120 kg N/ha (N120) nitrogen inputs. N 2 O emissions from soils irrigated at different salinity levels varied in a similar pattern which was triggered by soil moisture dynamics. Yet, the magnitudes of pulse N 2 O fluxes were significantly varied, with the peak flux at 5 g/L irrigation salinity level being much higher than at 2 and 8 g/L. Compared to fresh water irrigated soils, cumulative N 2 O fluxes were reduced by 22.7% and 39.6% (N0), 29.1% and 39.2% (N120) for soils irrigated with 2 and 8 g/L saline water, while they were increased by 87.7% (N0) and 58.3% (N120) for soils irrigated with 5 g/L saline water. These results suggested that the effect degree of salinity on consumption and production of N 2 O might vary among irrigation salinity ranges. As such, desalinating brackish water to a low salinity level (such as 2 g/L) before it is used for irrigation might be helpful for solving water resources crises and mitigating soil N 2 O emissions.

Suggested Citation

  • Qi Wei & Junzeng Xu & Linxian Liao & Yawei Li & Haiyu Wang & Shah Fahad Rahim, 2018. "Water Salinity Should Be Reduced for Irrigation to Minimize Its Risk of Increased Soil N 2 O Emissions," IJERPH, MDPI, vol. 15(10), pages 1-14, September.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:10:p:2114-:d:172057
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    References listed on IDEAS

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    1. Letey, J. & Feng, G.L., 2007. "Dynamic versus steady-state approaches to evaluate irrigation management of saline waters," Agricultural Water Management, Elsevier, vol. 91(1-3), pages 1-10, July.
    2. Baath, Gurjinder S. & Shukla, Manoj K. & Bosland, Paul W. & Steiner, Robert L. & Walker, Stephanie J., 2017. "Irrigation water salinity influences at various growth stages of Capsicum annuum," Agricultural Water Management, Elsevier, vol. 179(C), pages 246-253.
    3. Pereira, Luis Santos & Oweis, Theib & Zairi, Abdelaziz, 2002. "Irrigation management under water scarcity," Agricultural Water Management, Elsevier, vol. 57(3), pages 175-206, December.
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    Cited by:

    1. Ram K. Fagodiya & Sandeep K. Malyan & Devendra Singh & Amit Kumar & Rajender K. Yadav & Parbodh C. Sharma & Himanshu Pathak, 2022. "Greenhouse Gas Emissions from Salt-Affected Soils: Mechanistic Understanding of Interplay Factors and Reclamation Approaches," Sustainability, MDPI, vol. 14(19), pages 1-25, September.

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