Journal of Integrative Agriculture ›› 2014, Vol. 13 ›› Issue (10): 2286-2298.DOI: 10.1016/S2095-3119(14)60784-X

• 论文 • 上一篇    下一篇

Impact of Long-Term Fertilization on Community Structure of Ammonia Oxidizing and Denitrifying Bacteria Based on amoA and nirK Genes in a Rice Paddy from Tai Lake Region, China

 JIN  Zhen-jiang, LI  Lian-qing, LIU  Xiao-yu, PAN  Gen-xing, Qaiser  Hussein , LIU  Yong-zhuo   

  1. 1、Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, P.R.China
    2、Guilin University of Technology, Guilin 541004, P.R.China
  • 收稿日期:2013-12-25 出版日期:2014-10-01 发布日期:2014-10-10
  • 通讯作者: PAN Gen-xing, Tel: +86-25-84398657, E-mail: pangenxing@aliyun.com
  • 作者简介:JIN Zhen-jiang, E-mail: zhenjiangjinjin@163.com
  • 基金资助:

    This work was supported by the National Natural Science Foundation of China (40830528 and 40710019002).

Impact of Long-Term Fertilization on Community Structure of Ammonia Oxidizing and Denitrifying Bacteria Based on amoA and nirK Genes in a Rice Paddy from Tai Lake Region, China

 JIN  Zhen-jiang, LI  Lian-qing, LIU  Xiao-yu, PAN  Gen-xing, Qaiser  Hussein , LIU  Yong-zhuo   

  1. 1、Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, P.R.China
    2、Guilin University of Technology, Guilin 541004, P.R.China
  • Received:2013-12-25 Online:2014-10-01 Published:2014-10-10
  • Contact: PAN Gen-xing, Tel: +86-25-84398657, E-mail: pangenxing@aliyun.com
  • About author:JIN Zhen-jiang, E-mail: zhenjiangjinjin@163.com
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (40830528 and 40710019002).

摘要: Ammonia oxidizing (AOB) and denitrifying bacteria (DNB) play an important role in soil nitrogen transformation in natural and agricultural ecosystems. Effects of long-term fertilization on abundance and community composition of AOB and DNB were studied with targeting ammonia monooxygenase (amoA) and nitrite reductase (nirK) genes using polymerase chain reactiondenaturing gradient gel electrophoresis (PCR-DGGE) and real-time PCR, respectively. A field trial with different fertilization treatments in a rice paddy from Tai Lake region, centre East China was used in this study, including no fertilizer application (NF), balanced chemical fertilizers (CF), combined organic/inorganic fertilizer of balanced chemical fertilizers plus pig manure (CFM), and plus rice straw return (CFS). The abundances and richnesses of amoA and nirK were increased in CF, CFM and CFS compared to NF. Principle component analysis of DGGE profiles showed significant difference in nirK and amoA genes composition between organic amended (CFS and CFM) and the non-organic amended (CF and NF) plots. Number of amoA copies was significantly positively correlated with normalized soil nutrient richness (NSNR) of soil organic carbon (SOC) and total nitrogen (T-N), and that of nirK copies was with NSNR of SOC, T-N plus total phosphorus. Moreover, nitrification potential showed a positive correlation with SOC content, while a significantly lower denitrification potential was found under CFM compared to under CFS. Therefore, SOC accumulation accompanied with soil nutrient richness under long-term balanced and organic/inorganic combined fertilization promoted abundance and diversity of AOB and DNB in the rice paddy.

关键词: long-term fertilization , ammonia oxidizing bacteria , denitrifying bacteria , abundance , rice paddy

Abstract: Ammonia oxidizing (AOB) and denitrifying bacteria (DNB) play an important role in soil nitrogen transformation in natural and agricultural ecosystems. Effects of long-term fertilization on abundance and community composition of AOB and DNB were studied with targeting ammonia monooxygenase (amoA) and nitrite reductase (nirK) genes using polymerase chain reactiondenaturing gradient gel electrophoresis (PCR-DGGE) and real-time PCR, respectively. A field trial with different fertilization treatments in a rice paddy from Tai Lake region, centre East China was used in this study, including no fertilizer application (NF), balanced chemical fertilizers (CF), combined organic/inorganic fertilizer of balanced chemical fertilizers plus pig manure (CFM), and plus rice straw return (CFS). The abundances and richnesses of amoA and nirK were increased in CF, CFM and CFS compared to NF. Principle component analysis of DGGE profiles showed significant difference in nirK and amoA genes composition between organic amended (CFS and CFM) and the non-organic amended (CF and NF) plots. Number of amoA copies was significantly positively correlated with normalized soil nutrient richness (NSNR) of soil organic carbon (SOC) and total nitrogen (T-N), and that of nirK copies was with NSNR of SOC, T-N plus total phosphorus. Moreover, nitrification potential showed a positive correlation with SOC content, while a significantly lower denitrification potential was found under CFM compared to under CFS. Therefore, SOC accumulation accompanied with soil nutrient richness under long-term balanced and organic/inorganic combined fertilization promoted abundance and diversity of AOB and DNB in the rice paddy.

Key words: long-term fertilization , ammonia oxidizing bacteria , denitrifying bacteria , abundance , rice paddy