Evaluation of variation in background nitrous oxide emissions: A new global synthesis integrating the impacts of climate, soil, and management conditions,Global Change Biology

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Evaluation of variation in background nitrous oxide emissions: A new global synthesis integrating the impacts of climate, soil, and management conditions
Global Change Biology ( IF 10.8 ) Pub Date : 2021-09-02 , DOI: 10.1111/gcb.15860
Yulong Yin ₁ , Zihan Wang ₁ , Xingshuai Tian ₁ , Yingcheng Wang ₁ , Jiahui Cong ₁ , Zhenling Cui ₁

Affiliation

Robust global simulation of soil background N₂O emissions (BNEs) is a challenge due to the lack of a comprehensive system for quantification of the variations in their magnitude and location. We mapped global BNEs based on 1353 field observations from globally distributed sites and high-resolution climate and soil data. We then calculated global and national total BNE budgets and compared them to the IPCC-estimated values. The average BNE was 1.10, 0.92, and 0.84 kg N ha⁻¹ year⁻¹ with variations from 0.18 to 3.47 (5th–95th percentile, hereafter), 0.20 to 3.44, and −1.16 to 3.70 kg N ha⁻¹ year⁻¹ for cropland, forestland, and grassland, respectively. Soil pH, soil N mineralization, atmospheric N deposition, soil volumetric water content, and soil temperature were the principle significant drivers of BNEs. The total BNEs of three land use types was lower than IPCC-estimated total BNEs by 0.83 Tg (10¹² g) N year⁻¹, ranging from −47% to 94% across countries. The estimated BNE with cropland values were slightly higher than the IPCC estimates by 0.11 Tg N year⁻¹, and forestland and grassland lower than the IPCC estimates by 0.4 and 0.54 Tg N year⁻¹, respectively. Our study underlined the necessity for detailed estimation of the spatial distribution of BNEs to improve the estimates of global N₂O emissions and enable the establishment of more realistic and effective mitigation measures.

中文翻译：

评估背景一氧化二氮排放的变化：综合气候、土壤和管理条件影响的新全球综合

由于缺乏用于量化其幅度和位置变化的综合系统，因此对土壤背景 N ₂ O 排放 (BNE) 进行稳健的全球模拟是一项挑战。我们根据来自全球分布站点的 1353 次实地观测以及高分辨率气候和土壤数据绘制了全球 BNE。然后我们计算了全球和国家的 BNE 总预算，并将它们与 IPCC 的估计值进行了比较。平均 BNE 为 1.10、0.92 和 0.84 kg N ha ^-1 年^-1，变化范围为 0.18 至 3.47（第 5-95 个百分位数，下文）、0.20 至 3.44 和 -1.16 至 3.70 kg N ha ^-1 年^-1分别为农田、林地和草地。土壤 pH 值、土壤氮矿化、大气氮沉降、土壤体积含水量和土壤温度是 BNE 的主要驱动因素。三种土地利用类型的总 BNE 比 IPCC 估计的总 BNE 低 0.83 Tg (10 ¹² g) N 年^-1，各国范围从 -47% 到 94%。估计的农田 BNE 值比 IPCC 估计值略高 0.11 Tg N year ^-1，林地和草地值分别比 IPCC 估计值低 0.4 和 0.54 Tg N year ^-1。我们的研究强调了详细估计 BNE 空间分布的必要性，以改进对全球 N ₂的估计O 排放，并能够制定更现实和有效的缓解措施。

更新日期：2021-09-02

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