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硝化细菌在3种沉积土壤中的变化规律研究:Ⅱ.硝化细菌与pH等因子之间的关系

Keywords: 硝化细菌,沉积土壤,pH,含水率,气温

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Abstract:

硝化细菌在土壤氮素转化过程中起着重要的作用,为了研究其规律性,选用变质岩、沉积岩和花岗岩为母质的土壤为样品,模拟珠江三角洲地区的年降雨量和施肥量,用室内人工土柱法研究了3种土壤中硝化细菌的变化规律。整个模拟过程根据施肥和灌水频率的不同分为3个阶段。结果表明,在施肥阶段,硝化细菌数量随着含水率的增加而增加,没有施肥时细菌数量随着含水率的增加而减少;3种土壤的pH值均在3~7之间,浅层的pH值总是高于深层的pH值;3种土壤间的pH值差异性明显,大小顺序为变质岩>花岗岩>沉积岩;ΔpH值随着灌水频率的降低而增大。气温的增加促进硝化细菌的增长。通过数理统计分析揭示了表层土壤影响因子的变化必将引起深层土壤相应各因子的变化的特征。3种土壤不同的理化性质及物质组成引起了硝化细菌数量与pH值、含水率、气温等因子相互关系的差异性。

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