Nongrowing season N2O and CO2 emissions — Temporal dynamics and influence of soil texture and fall-applied manure 1
Nongrowing season N2O and CO2 emissions — Temporal dynamics and influence of soil texture and fall-applied manure 1
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DOI：
10.1139/cjss-2016-0110
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发表时间：
2016-11
影响因子：
1.7
通讯作者：
M. Chantigny;P. Rochette;D. Angers;C. Goyer;Lindsay D. Brin;N. Bertrand
中科院分区：
文献类型：
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作者：
M. Chantigny;P. Rochette;D. Angers;C. Goyer;Lindsay D. Brin;N. Bertrand
摘要：非生长季节（NGS）温室气体（GHG）排放量可能是显着的寒冷农业地区，但冬季条件，土壤类型和秋季施肥的影响，必须更好地记录。我们监测NGS N2 O和CO2通量和土壤大气组成，从2009年到2013年，在桑迪壤土和粉质粘土土壤，有和没有秋天施加猪泥浆。初冬的排放峰值表明，土壤呼吸和生物源N2 O的生产过程中活跃的土壤冻结刺激。整个冬季土壤大气温室气体浓度增加，而O2浓度下降，特别是当地表通量低。因此，土壤呼吸和反硝化作用并没有因为低温而停止，低的表面通量主要是由于气体扩散的限制。一氧化二氮的排放量从0.4到8.5千克氮公顷-1不等，一般在猪泥浆的存在下更大。土壤类型之间的排放量相似，可能是因为O2的限制反硝化作用通常发现在生长季节的桑迪土壤中被消除了高土壤水分含量的NGS。这一多年期评估突出表明，需要纳入NGS温室气体排放量，以正确估计寒冷地区的年排放量并完善清单，特别是对于桑迪土壤。
Abstract: Nongrowing season (NGS) greenhouse gas (GHG) emissions may be significant in cold agricultural regions, but the influence of winter conditions, soil type, and fall manuring must be better documented. We monitored NGS N2O and CO2 fluxes and soil atmosphere composition from 2009 to 2013, on sandy loam and silty clay soils, with and without fall-applied pig slurry. Early-winter emission peaks indicated that soil respiration and biogenic N2O production were stimulated during active soil freezing. Soil atmosphere GHG concentrations increased throughout winter, whereas O2 concentration declined, especially when surface fluxes were low. Therefore, soil respiration and denitrification were not stopped by cold temperatures, and low surface fluxes were mainly due to restriction of gas diffusion. Nitrous oxide emissions varied from 0.4 to 8.5 kg N ha-1 and were generally greater in the presence of pig slurry. Emissions were of similar magnitude between soil types, likely because O2 restrictions on denitrification typically found in sandy soils during the growing season were eliminated by high soil moisture content in the NGS. This multiyear assessment highlights the need to include NGS GHG emissions to properly estimate yearly emissions and refine inventories in cold regions, particularly for sandy soils.