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Suppressed N fixation and diazotrophs after four decades of fertilization.
Microbiome ( IF 15.5 ) Pub Date : 2019-10-31 , DOI: 10.1186/s40168-019-0757-8
Kunkun Fan 1, 2 , Manuel Delgado-Baquerizo 3, 4 , Xisheng Guo 5 , Daozhong Wang 5 , Yanying Wu 6 , Mo Zhu 6 , Wei Yu 6 , Huaiying Yao 7, 8 , Yong-Guan Zhu 7 , Haiyan Chu 1
Affiliation  

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.

中文翻译:

经过四十年的受精后,氮固定和固氮菌受到抑制。

背景技术固氮是地球上最重要的微生物驱动的生态系统过程之一,它允许氮从大气进入土壤,并调节植物生产力。有待回答的一个问题是,这样一个基本过程在过度施肥的世界中是否仍然那么重要,因为施肥对固氮和相关固氮群落的长期影响仍有待测试。在这里,我们进行了35年的施肥实验,研究了长期无机和有机施肥对固氮率和固氮群落的变化。结果发现,经过近四十年的受精后,氮固定量急剧减少(下降了 50%)。我们的结果进一步表明,功能损失与关键和系统发育聚类的氮固定剂(例如地杆菌属)相对丰度的减少有关。结论我们的工作表明,长期受精可能会选择不利于固氮和特定组的固氮剂。我们的研究提供了确凿的证据,表明在一个越来越施肥的世界中,固氮和某些固氮类群将在很大程度上受到抑制,这对土壤生物多样性和生态系统功能产生影响。
更新日期:2019-10-31
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