Long-term agronomic practices alter the composition of asymbiotic diazotrophic bacterial community and their nitrogen fixation genes in an acidic red soil |
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| Authors: | Weibing?Xun Wei?Li Ting?Huang Yi?Ren Wu?Xiong Youzhi?Miao Wei?Ran Dongchu?Li Qirong?Shen Email author" target="_blank">Ruifu?ZhangEmail author |
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| Institution: | 1.Jiangsu Provincial Key Lab for Solid Organic Waste Utilization, National Engineering Research Center for Organic-based Fertilizers, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization,Nanjing Agricultural University,Nanjing,People’s Republic of China;2.Key Laboratory of Microbial Resources Collection and Preservation, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing,People’s Republic of China;3.Hanlin College,Nanjing University of Chinese Medicine,Taizhou,People’s Republic of China;4.Qiyang Red Soil Experimental Station,Chinese Academy of Agricultural Sciences,Qiyang,People’s Republic of China |
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| Abstract: | The asymbiotic diazotrophic bacteria are important for nitrogen (N) input to soil. Here, we investigated asymbiotic diazotrophic bacteria in an acidic red soil from functional, phylogenetic, and ecological perspectives. We firstly confirmed that phosphorus (P) availability determines the overall asymbiotic N fixation potential in the red soil. Then, we analyzed the soil bacterial community and N fixing (nifH) gene composition. Long-term different fertilizations significantly affected the composition of soil bacterial community. In addition, long-term organic cultivations increased most of the asymbiotic diazotrophic bacteria and the corresponding nifH gene abundances. Few asymbiotic diazotrophic bacteria, belonging to Chloroflexaceae, Methylocystaceae, Enterobacteriaceae, and Pseudomonadaceae, and their corresponding nifH genes were more abundant in N and P co-limited than in not co-limited soils, suggesting that some bacterial taxa from these families might be activated under nutrient limited conditions. Our findings provided new information for the distribution of asymbiotic diazotrophic bacteria in red soil and gave insights into the ecology of diazotrophic bacteria. |
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