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首页> 外文期刊>African Journal of Biotechnology >Decomposition characteristics of maize (Zea mays. L.) straw with different carbon to nitrogen (C/N) ratios under various moisture regimes
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Decomposition characteristics of maize (Zea mays. L.) straw with different carbon to nitrogen (C/N) ratios under various moisture regimes

机译：不同水分条件下碳氮比不同的玉米秸秆的分解特性

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Decomposition of maize straw incorporated into soil with various nitrogen amended carbon to nitrogen (C/N) ratios under a range of moisture was studied through a laboratory incubation trial.?The experiment was set up to simulate the most suitable C/N ratio for straw carbon (C) decomposition and sequestering in the soil.?The purpose of this study was to determine organic C decomposition by measuring CO2?evolution using alkali traps. Maize straw mixed with clay loam topsoil was supplied with four initial nitrogen rates (40, 80, 160, 320 mg N/0.5 g C) using (NH4)2SO4,?to adjust its C/N ratio to 80, 40, 18 and 9. The soil moisture content was maintained at four moisture levels to achieve 60, 70, 80 and 90% of field capacity.?Each of the four nitrogen rates were tested against four moisture levels, arranged in complete randomized design?and incubated at 20°C for 52 days. Results reveal that decomposition rates and cumulative CO2-C was increased by about 40% in straw amended treatments as compared to the controls. On average, about 34.56% of the added straw C was mineralized to CO2-C. Also, there was highly significant relationship between CO2-C emission and incubation period (R2?= 0.98). Further, straw addition with interactive effect of nitrogen and moisture had significant relationships (p?< 0.05) with cumulative amounts of CO2-C, soil organic C and microbial biomass nitrogen. In conclusion, straw returning with appropriate N doses and optimum moisture can sequester and restore organic C in soil, thereby improving soil quality.
机译：通过实验室温育试验研究了在不同湿度下掺入不同氮含量的碳氮比下掺入土壤的玉米秸秆的分解过程。该实验旨在模拟最适合秸秆的碳氮比碳（C）的分解和螯合在土壤中。这项研究的目的是通过使用碱阱测量二氧化碳的释放来确定有机碳的分解。使用（NH4）2SO4向玉米秸秆与壤土表层土混合提供四个初始氮速率（40、80、160、320 mg N / 0.5 g C），以将其C / N比调整为80、40、18和9.将土壤水分保持在四个水分水平下，以达到田间持水量的60％，70％，80％和90％。？针对四个水分水平分别测试了四个氮素比率，以完全随机设计的方式进行布置，并在20℃下孵育℃52天。结果表明，与对照相比，秸秆改良处理的分解率和累积CO2-C增加了约40％。平均而言，大约34.56％的添加秸秆C矿化为CO2-C。另外，CO 2 -C的释放与潜伏期之间也具有高度显着的关系（R2α＝ 0.98）。此外，秸秆还田与氮和水分的交互作用与CO2-C，土壤有机碳和微生物生物量氮的累积量具有显着的关系（p <0.05）。总之，以适当的N剂量和最佳水分返回的稻草可以隔离和恢复土壤中的有机碳，从而改善土壤质量。

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