文献类型： 外文期刊
作者： Fan, Kunkun 1 ; Delgado-Baquerizo, Manuel 3 ; Guo, Xisheng 5 ; Wang, Daozhong 5 ; Wu, Yanying 6 ; Zhu, Mo 6 ; Yu, Wei; 1 ;
作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, 71 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA
4.Univ Rey Juan Carlos, Escuela Super Ciencias Expt & Tecnol, Dept Biol & Geol Fis & Quim Inorgan, C Tulipan S-N, Mostoles 28933, Spain
5.Anhui Acad Agr Sci, Inst Soil & Fertilizer Res, 40 South Nongke Rd, Hefei 230031, Anhui, Peoples R China
6.Nanjing Normal Univ, High Sch, Nanjing 210003, Jiangsu, Peoples R China
7.Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Environm & Hlth, Xiamen 361021, Fujian, Peoples R China
8.Wuhan Inst Technol, Sch Environm Ecol & Biol Engn, Wuhan 430205, Hubei, Peoples R China
关键词： Diazotrophs; Nitrogen fixation rates; Ecological clusters; Long-term fertilization
期刊名称：MICROBIOME （ 影响因子：14.65； 五年影响因子：15.677 ）
ISSN： 2049-2618
年卷期： 2019 年 7 卷 1 期
页码：
收录情况： SCI
摘要： Background N fixation is one of the most important microbially driven ecosystem processes on Earth, allowing N to enter the soil from the atmosphere, and regulating plant productivity. A question that remains to be answered is whether such a fundamental process would still be that important in an over-fertilized world, as the long-term effects of fertilization on N fixation and associated diazotrophic communities remain to be tested. Here, we used a 35-year fertilization experiment, and investigated the changes in N fixation rates and the diazotrophic community in response to long-term inorganic and organic fertilization. Results It was found that N fixation was drastically reduced (dropped by 50%) after almost four decades of fertilization. Our results further indicated that functionality losses were associated with reductions in the relative abundance of keystone and phylogenetically clustered N fixers such as Geobacter spp. Conclusions Our work suggests that long-term fertilization might have selected against N fixation and specific groups of N fixers. Our study provides solid evidence that N fixation and certain groups of diazotrophic taxa will be largely suppressed in a more and more fertilized world, with implications for soil biodiversity and ecosystem functions.
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