Acta Agrestia Sinica ›› 2023, Vol. 31 ›› Issue (12): 3785-3792.DOI: 10.11733/j.issn.1007-0435.2023.12.024

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Simulated Nitrogen deposition significantly increases nitrous oxide emission rate from alpine grassland on the Tibetan Plateau

XU Qing-min1, GU Xiao-meng1, WANG Yun-ying2, DU Yan-gong2   

  1. 1. Qinghai Ecological Environment Monitoring Center, Xining, Qinghai Province 810008, China;
    2. Northwest Institute of Plateau Biology, Chinese Academy of Science, Xining, Qinghai Province 810001, China
  • Received:2023-06-13 Revised:2023-07-25 Online:2023-12-15 Published:2024-01-03

模拟氮沉降显著提高青藏高原高寒草地氧化亚氮排放速率

许庆民1, 顾晓梦1, 王云英2, 杜岩功2   

  1. 1. 青海省生态环境监测中心, 青海 西宁 810008;
    2. 中国科学院西北高原生物研究所, 青海 西宁 810001
  • 通讯作者: 杜岩功,E-mail:ygdu@nwipb.cas.cn
  • 作者简介:许庆民(1983-),男,汉族,山东聊城人,硕士,高级工程师,主要从事高寒草地与全球变化研究,E-mail:403672585qq.com
  • 基金资助:
    青海省重点研发与转化计划项目(2022-NK-135);国家自然科学基金(U21A20186)资助

Abstract: The response characteristics are still unclear of N2O emission rate to simulated nitrogen deposition in alpine grasslands of the Tibetan Plateau. In this study,we conducted data integration and meta-analysis by collecting 83 groups of data. We calculated log response ratios (RR,hereafter response ratios) as measure of effect size. These results showed that simulated nitrogen deposition significantly increased N2O emission rates from alpine grassland on the Tibetan Plateau,with an increase range of 148.43% and the effect size of 0.91,respectively. Furthermore,the N2O emission rate of alpine meadows and steppes increased by 115.98% and 190.96% respectively (P<0.05). Effect sizes of the materials of nitrogen deposition were in a descending order,as potassium nitrate,livestock dung,ammonium sulfate,urea,ammonium nitrate,livestock urine,ammonium chloride,sodium nitrate. The latter two materials had the lowest impact on the N2O emission rate from alpine grassland on the Plateau,with an increase range of 43.33% and 34.99% respectively. The increase ranges of the low,middle and high doses of nitrogen deposition were 40.49%,197.13% and 339.29%,respectively. The effect size of nitrogen deposition was significantly affected by the dose of nitrogen deposition,soil nitrate nitrogen content,soil total nitrogen content,air temperature and aboveground biomass of grassland vegetation,and the former three factors could explain 28.32%,12.94% and 11.17% of the effect value variation,respectively. The increase of the nitrogen deposition in the future with warming climatic scenario may increase the N2O emission rate from alpine grassland on the Tibetan Plateau.

Key words: Nitrogen deposition, N2O, Effect size, Mixed effect model, Alpine grassland

摘要: 为揭示不同类型和剂量氮沉降下青藏高原高寒草地N2O排放速率的响应规律,本研究对83组N2O排放速率研究数据开展整合分析,结果表明:模拟氮沉降实验极显著增加高寒草地N2O排放速率,增加幅度和平均效应值分别为148.43%和0.91。高寒草甸和高原草原N2O排放速率增加幅度依次为115.98%和190.96%(P<0.05)。就不同类型氮素添加的平均效应值而言,硝酸钾>家畜粪便>硫酸铵>尿素>硝酸铵>家畜尿液>氯化铵>硝酸钠,其中后两者对青藏高原高寒草地N2O排放速率影响最低,增加幅度依次为43.33%和34.99%。低剂量、中剂量和高剂量氮素的平均增加幅度分别为40.49%,197.13%和339.29%。氮沉降平均效应值受氮素剂量、土壤硝态氮含量、全氮含量、年均气温和地上生物量的显著性影响,前三者分别可以解释28.32%,12.94%和11.17%的效应值变异。未来氮沉降增加情景可能显著增加青藏高原高寒草地N2O排放速率。

关键词: 氮沉降, 氧化亚氮, 平均效应值, 混合效应模型, 高寒草地

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