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Soil Organic Matter, Aggregates, and Microbial Characteristics of Intercropping Soybean under Straw Incorporation and N Input

Author

Listed:
  • Benchuan Zheng

    (College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
    Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu 611130, China
    Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Chengdu 611130, China)

  • Ping Chen

    (College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
    Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu 611130, China
    Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Chengdu 611130, China)

  • Qing Du

    (College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
    Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu 611130, China
    Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Chengdu 611130, China)

  • Huan Yang

    (College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
    Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu 611130, China
    Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Chengdu 611130, China)

  • Kai Luo

    (College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
    Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu 611130, China
    Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Chengdu 611130, China)

  • Xiaochun Wang

    (College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
    Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu 611130, China
    Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Chengdu 611130, China)

  • Feng Yang

    (College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
    Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu 611130, China
    Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Chengdu 611130, China)

  • Taiwen Yong

    (College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
    Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu 611130, China
    Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Chengdu 611130, China)

  • Wenyu Yang

    (College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
    Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu 611130, China
    Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Chengdu 611130, China)

Abstract

Soil organic matter (SOM), soil aggregates, and soil microbes play key roles in agriculture soil fertility. In intercropping systems, the influences of straw incorporation and N input on the dynamics of soil physicochemical and microbial properties and their relationships are still unclear. We explore the changes in soil physicochemical and microbial properties with two straw managements, i.e., wheat straw incorporation (SI) and straw removal (SR), and four N supply rates for intercropped soybean, i.e., 60 (N60), 30 (N30), 15 (N15), and 0 (N0) kg N ha −1 , in the wheat–maize–soybean relay strip intercropping systems. The results showed that SOM and SOM fractions contents, soil macroaggregate stability, and microbial and fungal α-diversity, e.g., Chao1 and Shannon indices, increased through straw incorporation and N input. The α-diversity was significantly positively correlated with soil physicochemical characteristics. Compared with SR, the relative abundance of Actinobacteria and Mortierellomycota in SI increased, but the relative abundance of Proteobacteria , Acidobacteria , and Ascomycota in SI decreased. In SI treatment, soil physicochemical characteristics and microbial diversity improved through N input, but that difference was not significant between N60 and N30. In conclusion, SI+N30 was the most effective way to maintain soil fertility and reduce the N fertilizer input in the wheat–maize–soybean relay strip intercropping.

Suggested Citation

  • Benchuan Zheng & Ping Chen & Qing Du & Huan Yang & Kai Luo & Xiaochun Wang & Feng Yang & Taiwen Yong & Wenyu Yang, 2022. "Soil Organic Matter, Aggregates, and Microbial Characteristics of Intercropping Soybean under Straw Incorporation and N Input," Agriculture, MDPI, vol. 12(9), pages 1-18, September.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:9:p:1409-:d:908796
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    References listed on IDEAS

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    1. Dong, Qin’ge & Yang, Yuchen & Yu, Kun & Feng, Hao, 2018. "Effects of straw mulching and plastic film mulching on improving soil organic carbon and nitrogen fractions, crop yield and water use efficiency in the Loess Plateau, China," Agricultural Water Management, Elsevier, vol. 201(C), pages 133-143.
    2. Mengqi Sun & Baoyu Chen & Hongjun Wang & Nan Wang & Taigang Ma & Yingshun Cui & Tianhao Luan & Seongjun Chun & Chunguang Liu & Lichun Wang, 2021. "Microbial Interactions and Roles in Soil Fertility in Seasonal Freeze-Thaw Periods under Different Straw Returning Strategies," Agriculture, MDPI, vol. 11(8), pages 1-15, August.
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