Repeated inoculations improve wheat yield through modifying the rhizobacterial communities and nitrogen and phosphorus fractions

文献类型： 外文期刊

第一作者： Chen, Yihui

作者： Chen, Yihui;Bai, Liyong;Lv, Cheng;Chen, Xiuguang;Li, Shuangshuang;Dai, Jiulan;Zang, Hongwei;Chen, Yihui;Dai, Jiulan

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关键词： Repeated inoculation; Nitrogen; Phosphorus; Microbial community; Yield

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.8； 五年影响因子：5.1 ）

ISSN： 0929-1393

年卷期： 2024 年 196 卷

页码：

收录情况： SCI

摘要： Introduced microorganisms have been a major concern in recent years due to their beneficial effects on crops and soils. Considering the transient survival of introduced microorganisms and their complex competition with native microbes, the single inoculation usually has limited effects. And the benefits of microbial inoculants (MIs) may become more pronounced with increasing inoculation frequency. Therefore, a comparative analysis was conducted to investigate the effects of MIs (including Bacillus subtilis, Bacillus cereus, Bacillus licheniformis, Paenibacillus polymyxa, Trichoderma, and Actinomycetes) on wheat growth, nitrogen (N) and phosphorus (P) fractions, and rhizobacterial communities in single and repeated inoculation soils. In general, repeated inoculation with MIs was more effective in the soil-crop system, resulting in increased yield by improving N uptake and Shannon diversity. Specifically, M5 (Bacillus subtilis + Paenibacillus polymyxa) and M6 (Bacillus subtilis + Bacillus licheniformis) increased yield by 30.1% and 32.5%, respectively. Increasing the inoculation frequency further expanded the differences in soil bacterial community structure, leading to an increase in Bacteroidetes abundance, which favoured yield-promoting. Additionally, repeated inoculation with certain MIs significantly increased the available N and NH4+-N contents, and AOA-amoA, AOB-amoA and nifH abundances, confirming an enhancement in microbial N fixation and nitrification processes. Furthermore, wheat yield was strongly affected by inorganic phosphorus, including NaHCO3-Pi and NaOH-Pi. Inorganic phosphorus (H2O-Pi, NaHCO3-Pi) and organic phosphorus (NaHCO3-Po, NaOH-Po) were significantly correlated with dominant bacterial phyla abundances. Finally, the comprehensive evaluation indicated that M5 is recommended as the most promising microbial inoculant in this area. Overall, our study provides valuable insight into the impact of regular inoculation with MI on crop growth, microbial community and N and P fractions.

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