Exogenous labile C application enhances Fe-P utilization for mycorrhizal plants through iron-reducing bacteria in subtropical soil

• X Ding ^[1] ; S Zhang ^[1] ; R Wang ^[2] ; X Liao ^[2] ; S Li ^[2]
  1. [1] Qingdao Agricultural University

     Qingdao Agricultural University

     China

     
  2. [2] Guangdong Institute of Eco-Environmental and Soil Sciences Guangdong Public Lab of Environmental Science and Technology
• Localización: Journal of soil science and plant nutrition, ISSN-e 0718-9516, ISSN 0718-9508, Vol. 14, Nº. 4, 2014, págs. 803-817
• Idioma: inglés
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• Resumen

  • In a greenhouse experiment, Medicago sativa was grown in iron-rich soil inoculated with arbuscular mycorrhizal fungi (Funelliformis mosseae, FM) and/or iron (Fe) -reducing bacteria (IRB, Klebsiella pneumoniae strain L17) with three exogenous labile C input forms (no C source, as a single dose, and as a pulse) at rates of P0 and P5 (0 and 5 mg P2O5 kg-1, KH2PO4), which is to understand the role of IRB in enhancing the Fe-P utilization with exogenous labile C in subtropical soil. The results showed when inoculated with IRB, labile C as a pulsed input significantly improved the mycorrhiza colonization and hyphal length density, and increased the shoot P content, microbial biomass C and glomalin content at P5 rate; meanwhile, the labile C input also promoted the Fe (II) production, when inoculated with IRB, labile C as a pulsed input increased the C/A extractable Fe (II), oxalate-extractable P and microbial biomass P content. These facts suggested that application of labile C as a pulsed input enhanced the ability of IRB in improving the Fe reduction and Fe-P utilization in subtropical soil.