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遇旱灌水和施肥方式对大豆土壤中铵态氮和硝态氮时空变异的影响

DOI: 10.7668/hbnxb.2014.S1.057, PP. 305-309

Keywords: 大豆,土壤,灌水,施肥方式,铵态氮,硝态氮,半方差,时空变异

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Abstract:

为了寻求水肥资源的合理利用方式,以九农21为材料,于2008年研究了遇旱灌水和施肥方式对大豆各生育期、各土层土壤中铵态氮和硝态氮变化的影响。结果表明,从各土层土壤中的铵态氮和硝态氮含量来看,灌水前优化施肥处理对保持土壤中的铵态氮和硝态氮含量效果明显,尤其是R1和R5期,减少了土壤中的氮损失。用地质统计学中的区域化变量理论和半方差函数分析,从变程值来看,灌水对优化施肥处理的铵态氮和硝态氮空间变异性程度影响较大;此外块金值与基台值之比较小,分别为0.02和0.21,表明由土壤的空间结构本身引起的空间变异性占主要部分,说明优化施肥处理对改变土壤的空间结构具有良好的作用。

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