Complementarity for nitrogen use in maize/faba bean intercropping with inoculation

文献类型： 外文期刊

第一作者： Li, Xiao-Fei

作者： Li, Xiao-Fei;Tian, Xiu-Li;Dong, Nan;Li, Long;Wang, Ping;Li, Xiao-Fei;Dong, Nan

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关键词： Complementarity effects; Crop diversity; N fixation; Niche differentiation; Selection effects

期刊名称：PLANT AND SOIL （ 影响因子：4.1； 五年影响因子：4.7 ）

ISSN： 0032-079X

年卷期： 2025 年 506 卷 1-2 期

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收录情况： SCI

摘要： Background and aims Intercropping with legumes is beneficial for crop nitrogen (N) uptake, but the mechanism behind efficient N uptake in intercropping is not well understood. Therefore, this study aimed to measure the effect of crop diversity on N uptake in intercrop and to assess the mechanisms contributing to diversity effects. Methods The N uptake on equivalent area basis was determined during 2012 to 2014 using a long-term experiment established in 2009 including faba bean/maize intercropping and corresponding monocultures. Complementarity effects (CE) and selection effects (SE) were calculated to assess N complementarity/facilitation and dominant species effects. Results Faba bean/maize intercropping had 17.6% greater system N uptake than weighted means of two monocultures. The fertilizer-N rate required to achieve the maximum total N uptake was 300 kg N ha-1 without inoculation and was 225 kg N ha-1 with inoculation. Similar results were observed for biological N fixation of faba bean. Enhanced N uptake from intercropping compared with monoculture was strongly and positively correlated with the CE, but not correlated with the SE. In addition, N fixation accounted for approximately 20% of the positive CE in faba bean/maize intercropping. Conclusions N complementarity and/or facilitation drove the increased N uptake in faba bean/maize intercropping. The results highlight the role of applying microbial inoculants to increase crop N uptake while reducing reliance on fertilizer N especially in newly reclaimed desert soils, and may also be useful for guiding the design of intercropping systems with complementary traits for efficient N use.

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