Effects of applied urea and straw on various nitrogen fractions in two Chinese paddy soils with differing clay mineralogy

文献类型： 外文期刊

第一作者： Peng, Pei-Qin

作者： Peng, Pei-Qin;Qiu, Shao-Jun;He, Ping;Qiu, Shao-Jun;Christie, Peter;Ju, Xiao-Tang;Peng, Pei-Qin;Li, Ling;Wu, Jin-Shui;Li, Ling;Liu, Qiang;Christie, Peter

作者机构：

关键词： Soil microbial biomass nitrogen;Clay mineral type;Acid-hydrolysable organic nitrogen fractions;N-15 tracer;Paddy soils

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.432； 五年影响因子：6.332 ）

ISSN： 0178-2762

年卷期： 2012 年 48 卷 2 期

页码：

收录情况： SCI

摘要： Combined application of synthetic nitrogen (N) fertilizers and organic materials can enhance soil quality, but little is known about the distribution of fertilizer N among different soil fractions after crop harvest. A pot experiment using N-15 tracer was employed to address this question with three treatments, i.e., labeled urea-only ((NU)-N-15), labeled urea + rice straw ((NU)-N-15-S) and labeled rice straw + urea ((NS)-N-15-U) applied to a Ferallic Cambisol (1: 1 type soil clay mineral) and a Calcaric Fluvisol (2: 1 clay mineral). Soil microbial biomass N, fixed ammonium (fixed NH4+), exchangeable ammonium and soil organic N fractions by hydrolysis (6 N HCl) and their isotope abundance were determined after the rice harvest. Soil newly formed N in urea + straw (U-S) treatments ((NU)-N-15-S, (NS)-N-15-U) was the sum of labeled urea-N in (NU)-N-15-S and labeled straw-N in (NS)-N-15-U. Compared with (NU)-N-15, U-S significantly (P < 0.05) increased the content and percentage of newly formed total soil N, acid insoluble N, amino acid N, and hydrolysable unknown N in both soils. In U-S treatment, straw amendment significantly (P < 0.05) reduced the content and percentage of newly formed fixed-NH4+-N in Fluvisol as compared with (NU)-N-15 treatments. Soil microbes contributed to the larger percentage of newly formed amino acid N (P < 0.01) in Cambisol as compared with Fluvisol. Fertilizer N in various soil fractions was therefore strongly affected by clay mineral type and microbes after the combined application of organic materials and synthetic N fertilizer.

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