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Effects of Nitrogen Input on Community Structure of the Denitrifying Bacteria with Nitrous Oxide Reductase Gene (nosZ I): a Long-Term Pond Experiment

Zhou, Jing; Kong, Yong; Wu, Mengmeng; Shu, Fengyue; Wang, Haijun; Ma, Shuonan; Li, Yan; Jeppesen, Erik


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        "affiliation": "Qufu Normal Univ, Sch Life Sci, Jining, Peoples R China", 
        "name": "Zhou, Jing"
      }, 
      {
        "affiliation": "Qufu Normal Univ, Sch Life Sci, Jining, Peoples R China", 
        "name": "Kong, Yong"
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      {
        "affiliation": "Shandong Freshwater Fisheries Res Inst, Jinan 250013, Peoples R China", 
        "name": "Wu, Mengmeng"
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      {
        "affiliation": "Qufu Normal Univ, Sch Life Sci, Jining, Peoples R China", 
        "name": "Shu, Fengyue"
      }, 
      {
        "name": "Wang, Haijun"
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      {
        "name": "Ma, Shuonan"
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      {
        "affiliation": "Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China", 
        "name": "Li, Yan"
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      {
        "name": "Jeppesen, Erik"
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    "description": "Excessive nitrogen (N) input is an important factor influencing aquatic ecosystems and has received increasing public attention in the past decades. It remains unclear how N input affects the denitrifying bacterial communities that play a key role in regulating N cycles in various ecosystems. To test our hypothesis-that the abundance and biodiversity of denitrifying bacterial communities decrease with increasing N-we compared the abundance and composition of denitrifying bacteria having nitrous oxide reductase gene (nosZ I) from sediments (0-20 cm) in five experimental ponds with different nitrogen fertilization treatment (TN10, TN20, TN30, TN40, TN50) using quantitative PCR and pyrosequencing techniques. We found that (1) N addition significantly decreased nosZ I gene abundance, (2) the Invsimpson and Shannon indices (reflecting biodiversity) first increased significantly along with the increasing N loading in TN10-TN40 followed by a decrease in TN50, (3) the beta diversity of the nosZ I denitrifier was clustered into three groups along the TN concentration levels: Cluster I (TN50), Cluster II (TN40), and Cluster III (TN10-TN30), (4) the proportions of Alphaproteobacteria and Betaproteobacteria in the high-N treatment (TN50) were significantly lower than in the lower N treatments (TN10-TN30). (5) The TN concentration was the most important factor driving the alteration of denitrifying bacteria assemblages. Our findings shed new light on the response of denitrification-related bacteria to long-term N loading at pond scale and on the response of denitrifying microorganisms to N pollution.", 
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      "title": "MICROBIAL ECOLOGY"
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    "title": "Effects of Nitrogen Input on Community Structure of the Denitrifying Bacteria with Nitrous Oxide Reductase Gene (nosZ I): a Long-Term Pond Experiment"
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