南土所褚海燕组揭示长期施肥抑制根际微生物固氮的作用机制
  • 安徽蒙城长期施肥实验平台,研究了不同施肥管理对小麦根际固氮活性及微生物的影响;
  • 长期的不同施肥管理均降低了50%根际与非根际土壤的固氮活性;
  • 共存网络与随机森林分析识别了与固氮活性最密切的微生物集群主要由寡营养型的地杆菌占优势;
  • 关键固氮微生物菌群在长期不施肥的环境下是系统发育聚集的,而施肥导致其系统发育呈现随机性状态;
  • 结构方程模型解析长期不同施肥影响固氮活性的机制,即施肥能直接和间接影响土壤固氮活性。
主编推荐语
刘永鑫-中科院-宏基因组
该研究耦合根际土壤固氮过程与关键固氮菌集群,从系统发育机制上解析了长期施肥抑制根际特定固氮菌集群的生长与功能,为集约化农业背景下土壤生物多样性保护及生态系统功能发挥提供科学依据。
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Microbiome [IF:11.607]

Suppressed N fixation and diazotrophs after four decades of fertilization

施肥四十年形成抑制固氮和固氮细菌

10.1186/s40168-019-0757-8

2019-10-31, Article

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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.

First Authors:
Kunkun Fan

Correspondence Authors:
Haiyan Chu

All Authors:
Kunkun Fan,Manuel Delgado-Baquerizo,Xisheng Guo,Daozhong Wang,Yanying Wu,Mo Zhu,Wei Yu,Huaiying Yao,Yong-Guan Zhu,Haiyan Chu

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