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Reducing Surface Wetting Proportion of Soils Irrigated by Subsurface Drip Irrigation Can Mitigate Soil N 2 O Emission

Author

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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)

  • Yawei Li

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

  • Linxian Liao

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

  • Boyi Liu

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

  • Guangqiu Jin

    (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)

  • Fazli Hameed

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

Abstract

To reveal the impact of soil moisture distributions on nitrous oxide (N 2 O) emissions from wet soils irrigated by sub-surface drip irrigation (SDI) with different surface soil wetting proportions, pot experiments were conducted, with surface irrigation (SI) as a control. Results indicated that irrigation triggered N 2 O pulsing effect in all SDI treatments, yet N 2 O values reduced with the decrease of surface soil wetting proportions of SDI irrigated soils, and the occurrence times were lagged. The peak N 2 O fluxes and the corresponding soil water filled pore space (WFPS), as well as the coefficients of determination (R 2 ) of the exponential function between N 2 O fluxes and soil WFPS, decreased with the reduction of surface soil wetting proportions with SDI treatment, and from the central sub-region to the periphery sub-region. The pulse period contributed most to the reduction of N 2 O emissions in SDI compared to SI treatments and should be a key period for N 2 O emission mitigation. Over the whole experimental period, the area-weighted average cumulative N 2 O fluxes from SDI treatments were 82.3–157.3 mg N 2 O m −2 lower than those from SI treatment, with periphery sub-regions of R3 and R4 (radius of 19–27 cm and 28–36 cm from the emitter horizontally) contributing to more than 75.8% of the total N 2 O emission mitigation. These results suggest that reducing surface soil wetting proportions or the increments of topsoil WFPS for SDI irrigated soils is a promising strategy for N 2 O emission reduction.

Suggested Citation

  • Qi Wei & Junzeng Xu & Yawei Li & Linxian Liao & Boyi Liu & Guangqiu Jin & Fazli Hameed, 2018. "Reducing Surface Wetting Proportion of Soils Irrigated by Subsurface Drip Irrigation Can Mitigate Soil N 2 O Emission," IJERPH, MDPI, vol. 15(12), pages 1-16, December.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:12:p:2747-:d:188066
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    References listed on IDEAS

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    1. Dave S. Reay & Eric A. Davidson & Keith A. Smith & Pete Smith & Jerry M. Melillo & Frank Dentener & Paul J. Crutzen, 2012. "Global agriculture and nitrous oxide emissions," Nature Climate Change, Nature, vol. 2(6), pages 410-416, June.
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