Statistical modeling of global soil NOx emissions
Statistical modeling of global soil NOx emissions
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DOI：
10.1029/2004gb002276
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发表时间：
2005-09
影响因子：
5.2
通讯作者：
Xiaoyuan Yan;T. Ohara;H. Akimoto
中科院分区：
文献类型：
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作者：
Xiaoyuan Yan;T. Ohara;H. Akimoto
在野外实测土壤氮氧化物排放的基础上，建立了土壤有机碳（SOC）含量、土壤pH值、土地覆盖类型、气候和氮素输入对氮氧化物排放影响的统计模型。在考虑土壤温度、土壤湿度变化引起的脉冲发射和植被火灾的影响的同时，我们以0.5°和6小时的分辨率模拟了全球土壤的氮氧化物排放。冠层缩减包括在数据处理和通量模拟中。氮氧化物排放量与SOC含量呈正相关，与土壤pH值呈负相关。在干旱或温带地区的土壤比在寒冷或热带地区的土壤有较高的氮氧化物排放潜力。针叶林和农业土壤的氮氧化物排放量高。全球土壤氮氧化物的年排放量计算为7.43 Tg N，减少冠层后下降到4.97 Tg N。全球平均的氮肥诱导排放率为1.16%以上的土壤和0.70%以上的冠层。土壤湿度变化引起的脉冲排放对全球NOx排放的贡献约为4%，植被火对土壤NOx排放的影响可以忽略不计。
On the basis of field measurements of NOx emissions from soils, we developed a statistical model to describe the influences of soil organic carbon (SOC) content, soil pH, land‐cover type, climate, and nitrogen input on NOx emission. While also considering the effects of soil temperature, soil moisture change‐induced pulse emission, and vegetation fire, we simulated NOx emissions from global soils at resolutions of 0.5° and 6 hours. Canopy reduction was included in both data processing and flux simulation. NOx emissions were positively correlated with SOC content and negatively correlated with soil pH. Soils in dry or temperate regions had higher NOx emission potentials than soils in cold or tropical regions. Needleleaf forest and agricultural soils had high NOx emissions. The annual NOx emission from global soils was calculated to be 7.43 Tg N, decreasing to 4.97 Tg N after canopy reduction. Global averages of nitrogen fertilizer–induced emission ratios were 1.16% above soil and 0.70% above canopy. Soil moisture change–induced pulse emission contributed about 4% to global annual NOx emission, and the effect of vegetation fire on soil NOx emission was negligible.