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Influence of soil moisture on codenitrification fluxes from a urea-affected pasture soil

机译:土壤水分对尿素影响草地土壤共硝化通量的影响

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摘要

Intensively managed agricultural pastures contribute to N2O and N2 fluxes resulting in detrimental environmental outcomes and poor N use efficiency, respectively. Besides nitrification, nitrifier-denitrification and heterotrophic denitrification, alternative pathways such as codenitrification also contribute to emissions under ruminant urine-affected soil. However, information on codenitrification is sparse. The objectives of this experiment were to assess the effects of soil moisture and soil inorganic-N dynamics on the relative contributions of codenitrification and denitrification (heterotrophic denitrification) to the N2O and N2 fluxes under a simulated ruminant urine event. Repacked soil cores were treated with 15N enriched urea and maintained at near saturation (−1 kPa) or field capacity (−10 kPa). Soil inorganic-N, pH, dissolved organic carbon, N2O and N2 fluxes were measured over 63 days. Fluxes of N2, attributable to codenitrification, were at a maximum when soil nitrite (NO2) concentrations were elevated. Cumulative codenitrification was higher (P = 0.043) at −1 kPa. However, the ratio of codenitrification to denitrification did not differ significantly with soil moisture, 25.5 ± 15.8 and 12.9 ± 4.8% (stdev) at −1 and −10 kPa, respectively. Elevated soil NO2 concentrations are shown to contribute to codenitrification, particularly at −1 kPa.
机译:集约化管理的农业牧场会促进N2O和N2的通量,分别导致不利的环境结果和不良的氮利用效率。除了硝化作用,硝化作用-反硝化作用和异养反硝化作用外,其他途径(例如共硝化作用)也有助于在反刍动物尿液影响的土壤中排放污染物。但是,关于共硝化的信息很少。该实验的目的是评估在模拟反刍动物尿液事件下,土壤水分和土壤无机氮动力学对共硝化和反硝化(异养反硝化)对N2O和N2通量的相对贡献的影响。重新包装的土壤核心用富 15 N的尿素处理,并保持在接近饱和(-1−kPa)或田间持水量(-10 kPa)的水平。在63天内测量了土壤无机氮,pH,溶解有机碳,N2O和N2通量。当亚硝酸盐(NO2 -)浓度升高时,可归因于共硝化的N2流量最大。在-1kPa时,累积共氮化作用更高(P = 0.043)。然而,共硝化与反硝化的比率与土壤水分没有显着差异,在-1和-10kPa时分别为25.5±15.8和12.9±4.8%(stdev)。研究表明,升高的土壤NO2 -浓度有助于共硝化,特别是在-1 kPa时。

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