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

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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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    3. Wang, Guangshuai & Liang, Yueping & Zhang, Qian & Jha, Shiva K. & Gao, Yang & Shen, Xiaojun & Sun, Jingsheng & Duan, Aiwang, 2016. "Mitigated CH4 and N2O emissions and improved irrigation water use efficiency in winter wheat field with surface drip irrigation in the North China Plain," Agricultural Water Management, Elsevier, vol. 163(C), pages 403-407.
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    2. Amar Ali Adam Hamad & Lixiao Ni & Hiba Shaghaleh & Elsayed Elsadek & Yousef Alhaj Hamoud, 2023. "Effect of Carbon Content in Wheat Straw Biochar on N 2 O and CO 2 Emissions and Pakchoi Productivity Under Different Soil Moisture Conditions," Sustainability, MDPI, vol. 15(6), pages 1-16, March.

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