铁还原菌对红壤菜地土壤磷形态转化的影响  

Effects of Iron-reducing bacteria on the transformation of phosphorus in vegetable red soils

作　　者：令狐荣云 王荣萍[2] 梁嘉伟[2] 廖新荣[2] 詹振寿[2] 吴永贵[1] 

机构地区：[1]贵州大学资源与环境工程学院,贵阳550025 [2]广东省生态环境技术研究所,广东省农业环境综合治理重点实验室,广州510650

出　　处：《农业环境科学学报》2016年第9期1742-1749,共8页Journal of Agro-Environment Science

基　　金：国家科技支撑项目“城郊区环保型高效农业关键技术研究与示范”(2014BAD14B05);省院合作“华南不同类型土壤累积态磷素生物活化关键技术研究”(2013B091500016);广州市科技计划项目“有机碳输入促进红壤菜地铁耦合固定态磷的活化机制”(201607010082);广东省科技计划项目“农业面源污染综合生态防控创新能力建设”(2015B070701017)项目

摘　　要：采用室内模拟试验,通过外源输入铁还原菌,研究铁还原菌对红壤菜地磷素形态转化的影响。试验结果表明：活性磷（resin-P、Na HCO3-Pi和Na HCO3-Po）占总磷的10%~19%,中稳定态磷（Na OH-Pi和Na OH-Po）约占总磷的35%,稳定态磷（D.HCl-Pi、C.HCl-Pi、C.HCl-Po和residual-P）占总磷的46%~55%;输入铁还原菌活化了磷素,使活性较高的resin-P、Na HCO3-Pi和Na OH-Pi含量上升,活性较低的D.HCl-Pi、C.HCl-Pi以及Na OH-Po含量降低,但对Na HCO3-Po和residual-P的影响不大;与此同时,添加铁还原菌提高了土壤pH值与有效磷（Bray-P）含量。相关性分析结果表明：pH与有机质、有效磷、resin-P、Na HCO3-Pi之间均呈现负相关关系;有机质与有效磷、resin-P和Na HCO3-Pi之间、有效磷与土壤活性磷之间均达到显著正相关水平。总的来说,铁还原菌的输入可以改变红壤菜地土壤中磷的形态,提高土壤活性磷的含量,对土壤磷素起到活化作用。Indoor simulation experiments were carried out to investigate the effects of exogenous iron-reducing bacteria（IRB）on the transformation of phosphorus（P）in vegetable red soils. The results shows that：labile P（including resin-P, Na HCO3-Piand Na HCO3-Po）accounted for 10%~19% of total P, moderately stable P（including Na OH-Piand Na OH-Po）was 35% and stable P（including D.HCl-Pi, C.HCl-Pi, C.HCl-Poand residual-P）46%~55%. The introduction of IRB increased the contents of resin-Pi, Na HCO3-Piand Na OH-Piwhich are of high P activity but declined the contents of D.HCl-Pi, C.HCl-Piand Na OH-Powhich are of low P activity. In addition, the introduc-tion of IRB increased soil pH and available P（Bray-P）content. Correlation analyses shows that：there is a negative correlation between pH and organic matter content, available P, resin-P and Na HCO3-Pi; the organic matter content has a significant positive relationship with available P, resin-P and Na HCO3-P; and there is also a significant positive correlation between available P and labile P. In summary, the introduction of iron-reducing bacteria changed the P species in the vegetable red soils, activated soil P and thus increased the content of soil active P.

关 键 词：铁还原菌 磷形态 转化 红壤菜地 

分 类 号：S153.6[农业科学—土壤学]