Rhizosphere processes in nitrate-rich barley soil tripled both N2O and N2 losses due to enhanced bacterial and fungal denitrification
Rhizosphere processes in nitrate-rich barley soil tripled both N2O and N2 losses due to enhanced bacterial and fungal denitrification
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由于细菌和真菌反硝化作用增强，富含硝酸盐的大麦土壤中的根际过程使 N2O 和 N2 损失增加了两倍
DOI：
10.1007/s11104-020-04457-9
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发表时间：
2020-02
期刊：
影响因子：
4.9
通讯作者：
Wu Di
中科院分区：
文献类型：
--
作者：
Senbayram Mehmet;Well Reinhard;Shan Jun;Bol Rol;Burkart Stefan;Jones David L.;Wu Di
当土壤与根系接触时，植物可以在微生态尺度上直接影响氮素转化过程。然而，由于测量植物-土壤系统中直接氮素损失的方法的局限性，根际过程对N2O产生和还原为氮气的影响很少被量化。我们首次开发了机器人连续流植物-土壤培养系统(使用He+O2+ CO_2)，并结合N2O-15N定位方法来研究植物根系活力的影响。关于：I)土壤中N2O和N_2的排放，II)不同途径对接受不同无机N形态的湿润土壤(85%持水容量)中N_2O通量的具体贡献。我们的结果表明，当使用硝基氮肥时，植物的存在使N2O和N2在生长期内的损失增加了两倍，但没有改变N2O/(N2O + N2)产品的比例。15N点偏好数据表明，细菌反硝化作用是硝态氮和氨氮处理土壤中观察到的N2O通量的主要来源，而大麦的存在增加了真菌N2O在硝酸盐处理土壤中的贡献。在收获后期间，施铵肥处理的N2O和N_2排放量显著增加，在根系老化的土壤中表现得更为明显。总体而言，我们的研究表明，在潮湿的农业土壤中，根际过程和氮素形态之间存在着显著的交互作用，影响着土壤中N2O和N2排放的大小、模式和来源。
Plants can directly affect nitrogen (N) transformation processes at the micro-ecological scale when soil comes into contact with roots. Due to the methodological limitations in measuring direct N2 losses in plant-soil systems, however, the effect of rhizosphere processes on N2O production and reduction to N2 has rarely been quantified. For the first time, we developed a robotic continuous flow plant-soil incubation system (using a He+O2 + CO2) combined with N2O 15N site preference approach to examine the effect of plant root activity (barley – Hordeum vulgare L.) on: i) soil-borne N2O and N2 emissions, ii) the specific contribution of different pathways to N2O fluxes in moist soils (85% water holding capacity) receiving different inorganic N forms. Our results showed that when a nitrate-based N fertiliser was applied, the presence of plants tripled both N2O and N2 losses during the growth period but did not alter the N2O/(N2O + N2) product ratio. The 15N site preference data indicated that bacterial denitrification was the dominant source contributing to the observed N2O fluxes in both nitrate and ammonium treated soils, whereas the presence of barley increased the contribution of fungal N2O in the nitrate treated soils. During the post-harvest period, N2O and N2 emissions significantly increased in the ammonium-fertilised treatment, being more pronounced in the soil with a senescing root system. Overall, our study showed a significant interaction between rhizosphere processes and N forms on the magnitude, patterns, and sources of soil borne N2O and N2 emissions in moist agricultural soils.
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高粱的生物硝化抑制（BNI）活性及其表征
影响因子：
4.9
作者：
Zakir, H. A. K. M.;Deshp;e, S. P.;Hash, C. T.;Sahrawat, K. L.
通讯作者：
Sahrawat, K. L.
DOI：
10.1111/nph.14057
发表时间：
2016-11
期刊：
The New phytologist
影响因子：
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DOI：
10.2136/sssaj1998.03615995006200010005x
发表时间：
1998-01-01
影响因子：
2.9
作者：
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Nakonechny, EM
影响因子：
7.4
作者：
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影响因子：
3.1
作者：
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