不同生境下氮沉降对土壤N2O通量影响的整合分析

doi:10.13287/j.1001-9332.202308.013

摘要/Abstract

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.

孔东彦, 杨灵芳, 刁静文, 郭鹏. 不同生境下氮沉降对土壤N₂O通量影响的整合分析[J]. 应用生态学报, 2023, 34(8): 2171-2177.

KONG Dongyan, YANG Lingfang, DIAO Jingwen, GUO Peng. Meta-analysis on the effects of nitrogen deposition on soil N₂O flux in different habitats[J]. Chinese Journal of Applied Ecology, 2023, 34(8): 2171-2177.

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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

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

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