Biological N fixation but not mineral N fertilization enhances the accumulation of N in peanut soil in maize/peanut intercropping system

文献类型： 外文期刊

第一作者： Zhao, Fengyan

作者： Zhao, Fengyan;Sun, Zhanxiang;Feng, Liangshan;Feng, Chen;Bai, Wei;Zheng, Jiaming;Zhang, Zhe;Yang, Ning;Cai, Qian;Xiang, Wuyan;Zhao, Fengyan;Sun, Zhanxiang;Feng, Liangshan;Feng, Chen;Bai, Wei;Zheng, Jiaming;Zhang, Zhe;Yang, Ning;Cai, Qian;Xiang, Wuyan;Zhang, Yongyong;Li, Hui;Jiang, Yong;Hohmann, Pierre

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关键词： Soil total nitrogen; Intercropping; Functional gene; Nitrogen fixation; Nodulation

期刊名称：JOURNAL OF AGRICULTURE AND FOOD RESEARCH （ 影响因子：3.8； 五年影响因子：3.9 ）

ISSN： 2666-1543

年卷期： 2022 年 10 卷

页码：

收录情况： SCI

摘要： Legume/cereal intercropping has the potential to maximize the use of resources to raise yields due to enhanced nitrogen (N) fixation by legume root nodules, while high N fertilization may inhibit the nodulation of legume. However, whether legume/cereal intercropping can promote the accumulation of soil N storage with N fertil-ization and its underlying mechanism are less clear. Here, we evaluated the long-term (5 years) effects of maize/ peanut intercropping and mineral N fertilization on peanut soil total N content and soil N cycling functional genes. The experiment includes two planting patterns (peanut maize intercropping and peanut monocropping) with three N fertilization rates (0, 150, and 300 kg N ha-1). Intercropping increased soil total N content (STN) by average 18.2%, and the positive effect of intercropping on STN decreased with N application rate. Highest N application decreased the nodule fresh weight (NFW) by 64.3% and 46.0% in intercropping and monocropping system, respectively. However, intercropping has no effect on NFW. Intercropping increased the nifH gene abundance by average 26.5%. SEM analysis indicated that NFW and nifH gene abundance combined can explain 46% of the variance of STN. Our results indicate that biological N fixation but not mineral N fertilization en-hances the accumulation of N in soil planted with peanut in maize/peanut intercropping system.

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