Nitrification Potential of Soils Under Liquid Incubation Conditions

YUAN Fei; RAN Wei; SHEN Qi-Rong

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Nitrification Potential of Soils Under Liquid Incubation Conditions

机译：液体培养条件下土壤的硝化潜力

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A red soil, a fluvo-aquic soil and a permeable paddy soil were used in a long-term investigation to study changes in nitrification with treatments: 1) soil incubation, 2) liquid incubation inoculated with soil samples, and 3) liquid incubation inoculated with ammonia-oxidizing bacteria (AOB) from the soils. There were significant differences (P ＜ 0.001) in nitrification rates among the three soils when measured for 28 days by adding (NH4)2SO4 at the rate of 154 mg N kg-1 dry soil to fresh soil. However, the amounts of nitrifying bacteria in the three soils were not related to soil nitrification capacity. When the soil samples or the isolates of AOB enriched from the corresponding soil were incubated in liquid with pH 5.8, 7.0 and 8.0 buffers and 10 mmol L-1 ammonium nitrogen, there were no significant nitrification differences in the same soil type at each pH. The ability to oxidize ammonia through AOB from different types of soils in a homogeneous culture medium was similar, and the soil nitrification capacity could reflect the inherent properties of a soil. Altering the culture medium pH of individual soil type also showed that acidification of an alkaline fluvo-aquic soil decreased nitrification capacity, whereas alkalinization of the acidic red soil and permeable paddy soil increased their nitrification. For a better insight into factors influencing soil nitrification processes, soil properties including texture and clay composition should be considered.

机译：长期研究中使用了红壤，潮土和可渗透的稻田土壤来研究硝化作用的变化：1）土壤培养，2）液体样品接种的液体培养，3）液体培养的接种与土壤中的氨氧化细菌（AOB）接触。通过以154 mg N kg-1干燥土壤的比例向新鲜土壤中添加（NH4）2SO4进行28天的测量，三种土壤之间的硝化速率存在显着差异（P ＜0.001）。但是，三种土壤中硝化细菌的数量与土壤硝化能力无关。当土壤样品或从相应土壤中富集的AOB分离株在pH 5.8、7.0和8.0缓冲液以及10 mmol L-1铵态氮的液体中孵育时，相同土壤类型在每种pH下均没有明显的硝化差异。在均质培养基中通过不同类型土壤从AOB氧化氨的能力是相似的，土壤硝化能力可以反映土壤的固有特性。改变个别土壤类型的培养基pH值还表明，碱性潮土的酸化会降低硝化能力，而酸性红壤和渗透性稻田的碱化会增加硝化作用。为了更好地了解影响土壤硝化过程的因素，应考虑土壤特性，包括质地和粘土成分。

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来源
《土壤圈（英文版）》 |2005年第3期|379-385|共7页
作者
YUAN Fei; RAN Wei; SHEN Qi-Rong;
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作者单位

College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 China;

College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 China;

College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类土壤学;
关键词
ammonia-oxidizing bacteria; nitrification; pH; soil type;

机译：氨氧化细菌;硝化;pH;土壤类型;

Nitrification Potential of Soils Under Liquid Incubation Conditions

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