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首页> 外文会议>Third International Symposium on Non-Co_2 Greenhouse Gases: Scientific Understanding, Control Options and Policy Aspects Jan 21-23, 2002 Maastricht, The Netherlands >Denitrification and emission of N_2O from different soils and ~(15)N labelled fertilizers under anaerobic rice culture
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Denitrification and emission of N_2O from different soils and ~(15)N labelled fertilizers under anaerobic rice culture

机译：厌氧条件下不同土壤和〜（15）N标记肥料对N_2O的反硝化和排放

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摘要

To quantify the denitrification and evolution of N_2O from soils under anaerobic rice crop a green house study was conducted using three soils (viz. acid, normal, and sodic) and three ~(15)N labelled fertilizers (viz. (NH4)_2SO_4, urea and KNO_3 using gas chamber on the 50-cm soil column to tap the emanating N_2O and N_2 from soil. Evolution of N_2 and N_2O was masure up to 32 days after application of N at 100 mg kg~(-1) at transplanting of rice. After 32 days, plant and soil samples were taken and analysed for total N and ~(15)N contents for mass balance studies. The results have showed much of the denitrification, in the first 7 days after fertilizer application. Among the N sources, KNO_3 showed maximum denitrification in acid soil, in the first 7 days followed by sodic and normal soils. Whereas, urea and ammonium sulphate showed almost similar fluxes in normal soil followed by sodic and acid soils. From 27 days onwards there were almost similar fluxes of N_2+N_2O and N_2O among the N sources or soil types. On the basis of ~(15)N balance it has been revealed that unaccounted for fertilizer N loss was maximum due to use of KNO_3, being 54, 49, and 55% in acid, normal and sodic soils, respectively. With urea such losses was 35, 33, and 47% in the same order of soils. The (NH4)_2SO_4 has been found most effective source of N in submerged rice because of minimum emission and unaccounted for N losses from the soil-plant systems.
机译：为了量化厌氧水稻作物下土壤中N_2O的反硝化作用和演变，我们进行了温室研究，使用了三种土壤（分别是酸，普通和钠）和三种〜（15）N标记的肥料（即（NH4）_2SO_4，尿素和KNO_3在50厘米厚的土壤柱上用气室吸收了从土壤中释放出来的N_2O和N_2，在移栽N2，100mg kg〜（-1）后保证了N_2和N_2O的释放。 32天后，采集植物和土壤样品，分析其总氮和〜（15）N含量，以进行质量平衡研究，结果表明，施肥后的前7天大部分反硝化作用。资料显示，KNO_3在酸性土壤中的反硝化作用最大，在开始的7天中，其次是苏打水和普通土壤；而尿素和硫酸铵在正常土壤中的通量几乎相同，其次是苏打水和酸性土壤；从27天开始，几乎相同N_2 + N_2O和N_2O之间的通量氮源或土壤类型。根据〜（15）N的平衡，已发现由于使用KNO_3，未解释的肥料N损失最大，分别在酸性，正常和钠土中分别为54、49和55％。对于尿素，在相同的土壤顺序下，此类损失分别为35％，33％和47％。 （NH4）_2SO_4已被发现是淹没稻米中最有效的氮源，因为它的排放量最低，并且无法解释土壤-植物系统中的氮损失。

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