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Effects of corn-soybean rotation system on soil nitrogen-fixing bacteria community structure and quality in black soil

FENG Xue-wan;LI Cui-lan;PENG Chang;ZHANG Jin-jing;LIN Yuan;LIU Hang;Key Laboratory of Sustainable Utilization of Soil Resources in Commodity Grain Base of Jilin Province,College of Resources and Environment, Jilin Agricultural University;Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences;  
The effects of soybean continuous cropping(CS), maize continuous cropping(CM),corn-soybean rotation(MS), corn-corn-soybean(MMS) and corn-soy-soybean(MSS) on soil nitrogen fixing bacteria abundance and community structure were analyzed by fluorescence quantitative PCR and high-throughput sequencing. The results showed that soil organic matter(SOM), total phosphorus(TP), available nitrogen(AN) and available phosphorus(AP) contents in rotation were significantly higher than those in continuous cropping. The abundance of nitrogen-fixing bacteria in rotation was significantly higher than that in CM and significantly lower than that in CS. The diversity of NITR Ogen-fixing bacteria in MMS and MSS was significantly higher than that in CM. Total nitrogen(TN) was the main driving factor for the change of nitrogen-fixing bacteria community structure. Planting system indirectly affected the abundance and diversity of nitrogen-fixing bacteria through soil chemical properties. These results indicate that MSS and MMS are more conducive to the propagation of soil nitrogenfixing bacteria in the semi-arid area of Western Jilin province, which can provide scientific basis for rational planting and nitrogen regulation from the perspective of microbiology.
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