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应用生态学报 ›› 2023, Vol. 34 ›› Issue (8): 2171-2177.doi: 10.13287/j.1001-9332.202308.013

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不同生境下氮沉降对土壤N2O通量影响的整合分析

孔东彦, 杨灵芳, 刁静文, 郭鹏*   

  1. 河北科技大学食品与生物学院, 石家庄 050018
  • 收稿日期:2023-03-02 接受日期:2023-06-29 出版日期:2023-08-15 发布日期:2024-02-15
  • 通讯作者: *E-mail: guopeng@hebust.edu.cn
  • 作者简介:孔东彦, 女, 1998年生, 硕士研究生。主要从事氮沉降生态学研究。E-mail: 857539730@qq.com
  • 基金资助:
    河北省自然科学基金项目(C2020208001)和河北省高层次人才培养工程项目(A201901041)

Meta-analysis on the effects of nitrogen deposition on soil N2O flux in different habitats

KONG Dongyan, YANG Lingfang, DIAO Jingwen, GUO Peng*   

  1. College of Food Science and Biology, Hebei University of Science and Technology, Shijiazhuang 050018, China
  • Received:2023-03-02 Accepted:2023-06-29 Online:2023-08-15 Published:2024-02-15

摘要: 基于在我国开展的66个野外氮沉降模拟试验的290组数据,采用整合分析方法,探究实验样地特征(气候因子、土壤性质)和施氮因素对施氮后土壤N2O通量变化的影响。结果表明: 样地的年均降水量、年均温、自然氮沉降量和土壤C/N与施氮后N2O通量增幅呈显著正相关,土壤pH与施氮后N2O通量增幅呈显著负相关。湿地生态系统土壤对施氮最敏感,森林生态系统次之,草原生态系统最小。所有的样地因子中,土壤pH和C/N对施氮后N2O通量变化幅度的影响最大。施加硝态氮后土壤N2O通量增幅最大,施加尿素与铵态氮后N2O通量增幅相当,而施加硝酸铵后N2O通量增幅最小。综上,在准确评估和预测土壤N2O通量对氮沉降的响应时,应综合考虑样地特征及氮源种类的影响。

关键词: 整合分析, 氮沉降, 氧化亚氮(N2O)通量, 环境因子, 土壤C/N, 生态系统类型

Abstract: We carried out a meta-analysis to explore the effects of site characteristics (climatic factors and soil properties) and nitrogen (N) factors on soil nitrous oxide (N2O) flux after N addition based on 290 data from 66 field N addition experiments in China. The results showed that mean annual precipitation, mean annual temperature, ambient N deposition rate, and soil C/N of sites were positively correlated with the increases of N2O flux after N addition. Soil pH was negatively correlated with the increases of N2O flux after N addition. Furthermore, soils in wetland ecosystem were most sensitive to N addition, followed by forest ecosystem, and grassland showed the lowest sensitivity. Among all the site characteristics, soil pH and C/N were the most important factors driving the responses of N2O flux to N addition. Soil N2O flux increased the greatest after nitrate addition. The increase of N2O flux was similar after the addition of urea and ammonium, while N2O flux increased the least when ammonium nitrate was added. In summary, to accurately assess and predict the response of soil N2O flux to N deposition, the effects of site characteristics and N fertilizer types should be comprehensively considered.

Key words: meta-analysis, nitrogen deposition, nitrous oxide (N2O) flux, environmental factor, soil C/N, ecosystem type.