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Can N Fertilizer Addition Affect N 2 O Isotopocule Signatures for Soil N 2 O Source Partitioning?

Author

Listed:
  • Peiyi Zhang

    (School of Geography Science, Nanjing Normal University, Nanjing 210023, China)

  • Teng Wen

    (School of Geography Science, Nanjing Normal University, Nanjing 210023, China
    Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing 210023, China
    Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China)

  • Yangmei Hu

    (School of Geography Science, Nanjing Normal University, Nanjing 210023, China)

  • Jinbo Zhang

    (School of Geography Science, Nanjing Normal University, Nanjing 210023, China
    Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing 210023, China
    Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China)

  • Zucong Cai

    (School of Geography Science, Nanjing Normal University, Nanjing 210023, China
    Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing 210023, China
    Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China)

Abstract

Isotopocule signatures of N 2 O (δ 15 N bulk , δ 18 O and site preference) are useful for discerning soil N 2 O source, but sometimes, N fertilizer is needed to ensure that there is enough N 2 O flux for accurate isotopocule measurements. However, whether fertilizer affects these measurements is unknown. This study evaluated a gradient of NH 4 NO 3 addition on N 2 O productions and isotopocule values in two acidic subtropical soils. The results showed that N 2 O production rates obviously amplified with increasing NH 4 NO 3 ( p < 0.01), although a lower N 2 O production rate and an increasing extent appeared in forest soil. The δ 15 N bulk of N 2 O produced in forest soil was progressively enriched when more NH 4 NO 3 was added, while becoming more depleted of agricultural soil. Moreover, the N 2 O site preference (SP) values collectively elevated with increasing NH 4 NO 3 in both soils, indicating that N 2 O contributions changed. The increased N 2 O production in agricultural soil was predominantly due to the added NH 4 NO 3 via autotrophic nitrification and fungal denitrification (beyond 50%), which significantly increased with added NH 4 NO 3 , whereas soil organic nitrogen contributed most to N 2 O production in forest soil, probably via heterotrophic nitrification. Lacking the characteristic SP of heterotrophic nitrification, its N 2 O contribution change cannot be accurately identified yet. Overall, N fertilizer should be applied strictly according to the field application rate or N deposition amount when using isotopocule signatures to estimate soil N 2 O processes.

Suggested Citation

  • Peiyi Zhang & Teng Wen & Yangmei Hu & Jinbo Zhang & Zucong Cai, 2021. "Can N Fertilizer Addition Affect N 2 O Isotopocule Signatures for Soil N 2 O Source Partitioning?," IJERPH, MDPI, vol. 18(9), pages 1-10, May.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:9:p:5024-:d:551375
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    References listed on IDEAS

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    1. Naohiro Yoshida & Sakae Toyoda, 2000. "Constraining the atmospheric N2O budget from intramolecular site preference in N2O isotopomers," Nature, Nature, vol. 405(6784), pages 330-334, May.
    2. Xiangwen Wu & Shuying Zang & Dalong Ma & Jianhua Ren & Qiang Chen & Xingfeng Dong, 2019. "Emissions of CO 2 , CH 4 , and N 2 O Fluxes from Forest Soil in Permafrost Region of Daxing’an Mountains, Northeast China," IJERPH, MDPI, vol. 16(16), pages 1-14, August.
    3. Kaikai Fang & Xiaomei Yi & Wei Dai & Hui Gao & Linkui Cao, 2019. "Effects of Integrated Rice-Frog Farming on Paddy Field Greenhouse Gas Emissions," IJERPH, MDPI, vol. 16(11), pages 1-17, May.
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