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首页> 外文期刊>International journal of soil science >Nitrogen Mineralization Dynamics under Different Moisture Regimes in Tropical Soils
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Nitrogen Mineralization Dynamics under Different Moisture Regimes in Tropical Soils

机译：不同水分条件下热带土壤氮矿化动态

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This study was conducted to assess nitrogen (N) mineralization from Soil Organic Matter (SOM) in situ and in laboratory incubation under different soil moisture regimes. Andosol soils were sampled from coffee (CF) and crop (CP) land uses of southern Ethiopia. Extractable NO3ˉ-N and mineral N were strongly increased, while NH4+-N declined in response to soil moisture increase (from air dry to 100% FC, field capacity) during laboratory incubation. In situ extractable NO3ˉ-N and mineral N were strikingly low in December (dry) with both CF and CP. However, they were consistently greater during March to August due to more rain flushes, suggesting better N release during cropping season. Increasing soil moisture from air dry to 100% FC enhanced extractable NO3ˉ-N and mineral N of CF by 95.7 and 81.7%, respectively, while that of CP was increased by 58.7 and 46.4% respectively. By contrast, extractable NH4+-N declined by 82.9% with CF and by 87.0% with CP. The assessment of N mineralization in relation with soil moisture showed consistent trends both under in situ and laboratory methods. Indeed, the N mineralization of CF was about double to that of CP at 75-100% FC and during July-August (wet season). In contrast, average in situ N mineralization of CP was greater than CF, attributed to longer history of annual inputs of N-fertilizer and might be because of absence of actively competing plants with soil microorganisms. Generally, the knowledge of annual patterns of N mineralization in relation with soil moisture is necessary to synchronize crop N demands with plant-available N in the soil.
机译：进行这项研究是为了评估土壤有机质（SOM）中原位和在不同土壤湿度条件下的实验室培养中氮（N）的矿化作用。从埃塞俄比亚南部的咖啡（CF）和农作物（CP）土地使用中取样得到了Andosol土壤。随着土壤水分的增加（来自空气），可提取的NO 3 ˉ-N和矿质氮急剧增加，而NH 4 + -N下降在实验室孵育期间干燥至100％FC，现场处理能力）。 CF和CP均使12月（干燥）的原位可萃取NO 3 ˉ-N和矿物质N极低。然而，由于更多的雨水冲刷，3月至8月的氮含量一直较高，这表明在种植季节氮素释放更好。空气干燥使土壤水分增加至100％FC，可使CF的可提取NO 3 ˉ-N和矿物质N分别增加95.7和81.7％，而CP的可提取NO分别增加58.7和46.4％。相比之下，CF提取的NH 4 + -N下降82.9％，CP下降87.0％。在原位和实验室方法下，与土壤水分有关的氮矿化评估均显示出一致的趋势。实际上，在7月至8月（湿季），CF在75-100％FC时的氮矿化量约为CP的两倍。相反，CP的平均原位N矿化度大于CF，这归因于氮肥年投入的历史较长，并且可能是由于缺乏与土壤微生物积极竞争的植物。通常，必须了解与土壤水分有关的氮矿化的年度模式，才能使作物的氮需求与土壤中植物可用的氮同步。

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