Responses of soil surface greenhouse gas emissions to nitrogen and sulfur fertilizer rates to Brassica carinata grown as a bio-jet fuel
Responses of soil surface greenhouse gas emissions to nitrogen and sulfur fertilizer rates to Brassica carinata grown as a bio-jet fuel
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DOI：
10.1111/gcbb.12784
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发表时间：
2021-02-11
影响因子：
5.6
通讯作者：
Kumar, Sandeep
中科院分区：
文献类型：
--
作者：
Bhattarai, Dwarika;Abagandura, Gandura O.;Kumar, Sandeep
Carinata（Brassica carinata A.）Braun）是一种非食用油料作物和替代生物喷气燃料原料，因其作为美国北方大平原半干旱地区生产的低投入选择的潜力而受到关注。研究解决氮（N）和硫（S）肥料对土壤和温室气体（GHG; CO2，N2 O和CH 4）排放的影响是有限的。因此，本研究的目的是评估不同比例的N和S肥料施加到carinata对土壤性质和温室气体排放的影响。在2017年和2018年进行了田间试验，以评估隆线草对四种N（56，84，112和140 kg N ha（-1））和三种S（0，22和45 kg S ha（-1））的反应。于作物收获时收集土壤样本以测量土壤性质;然而，于二零一七年及二零一八年生长季使用静态箱法测量土壤表面温室气体通量。结果表明，施用氮肥增加了土壤EC、土壤有机碳、稳定碳和活性氮。但硫肥降低了土壤有机碳、活性氮和无机氮含量。温室气体通量的结果表明，较高的氮肥施用量增加了土壤CO2和N2 O的排放量，而硫肥对这些通量没有影响。本研究的结论是，S和N肥料的应用到carinata作物影响土壤性质，和较高的N肥比例增加温室气体排放。因此，需要优化氮肥施用量，以减少carinata生产的温室气体排放。
Carinata (Brassica carinata A. Braun), a non-food oilseed crop and an alternative bio-jet fuel feedstock, has received attention for its potential as a low-input option for production in the semi-arid region of the Northern Great Plains of the United States. Research addressing the impacts of nitrogen (N) and sulfur (S) fertilizers on soils and greenhouse gas (GHG; CO2, N2O, and CH4) emissions from carinata production are limited. Thus, objective of this study was to evaluate the impact of different rates of N and S fertilizers applied to carinata on soil properties and GHG emissions. Field experiments were conducted in 2017 and 2018 to assess the response of carinata to four N (56, 84, 112, and 140 kg N ha(-1)) and three S (0, 22, and 45 kg S ha(-1)) rates. Soil samples were collected at crop harvest to measure soil properties; however, soil surface GHG fluxes were measured during 2017 and 2018 growing seasons using static chamber method. Data showed that application of N fertilizer increased soil EC, soil organic carbon (SOC), stable C, and labile N. However, sulfur fertilizer decreased SOC, labile N, and soil inorganic N contents. Results from GHG fluxes showed that higher rates of N fertilizer application increased the soil CO2 and N2O emissions, whereas the S fertilizer did not impact these fluxes. This study concludes that S and N fertilizers application to carinata crop affected soil properties, and higher rates of N fertilizer increased the GHG emissions. Therefore, N fertilizer application rate needs to be optimized to mitigate GHG emission for carinata production.