培养温度和土壤类型对土壤硝化特性的影响
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国家重点基础研究发展规划项目(2011CB100506)和国家自然科学基金重大项目(40871123)


Effects of incubation temperature and soil type on soil nitrification
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    摘要:

    采用室内恒温好气培养方法,研究了温度(15℃、20℃、25℃和30℃)和土壤类型(黑土、潮土和红壤)对土壤硝化率的影响。氮素加入比率为N 200 mg kg-1土壤。结果表明:在15~30℃培养范围内,随着培养温度的升高,硝化率呈升高趋势;硝态氮累积量和培养积温(培养温度×培养天数,温度以0℃为基准)之间的关系可用单参数指数模型表示。在相同培养温度条件下,供试土壤硝化率从大到小的顺序为:高有机质含量潮土> 低有机质含量潮土> 高有机质含量黑土> 低有机质含量黑土> 低有机质含量红壤> 高有机质含量红壤。硝化率(25℃恒温培养)与土壤全磷含量、全钾含量、黏粒含量及pH呈极显著相关;土壤pH和全磷含量解释了硝化率差异的98.1%。土壤pH是影响其硝化率的主要因素,并抑制土壤有机质含量及温度对硝化率的影响。

    Abstract:

    An incubation experiment was conducted to evaluate the effects of temperatureand soil types on soil net nitrification rate. Four temperatures (15, 20, 25, and 30℃) were set, and three types of soils (black soil, chao soil, and red soil) with high and low content of soil organic matter (SOM) were selected. Urea N was applied at an equivalent rate of 200 mg kg-1 soil. All soil nitrification rates increased along with incubation temperature within the range of 15~30℃, and the relationship between accumulated soil NO3-N contents and accumulation temperature of incubation (T×t, ℃×d) could be fitted by a single exponential model. Under the same incubation temperature, the soil nitrification rates decreased in a sequence of: chao soil with high SOM > chao soil with low SOM >black soil with high SOM > black soil with low SOM > red soil with low SOM > red soil with high SOM. There was a significant relationships between soil nitrification rate (incubated under 25℃ for 14 days) and soil total phosporus (TP), total potassium (TK), clay content and pH. Soil pH and TP content was the key factors controlling nitrification rate ( R 2=0.981).

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王帘里,孙波.培养温度和土壤类型对土壤硝化特性的影响[J].土壤学报,2011,48(6):1173-1179. DOI:10.11766/trxb201006210253 Wang Lianli, Sun Bo. Effects of incubation temperature and soil type on soil nitrification[J]. Acta Pedologica Sinica,2011,48(6):1173-1179.

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  • 收稿日期:2010-06-21
  • 最后修改日期:2010-10-25
  • 录用日期:2010-11-29
  • 在线发布日期: 2011-09-02
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