Abstract
Aims
This study investigated maize-soil biota interactions as well as the soil legacy effects of continuous monoculture (CM) on maize performance.
Methods
We conducted a glasshouse experiment that compared the performance of maize inoculated with living or sterilized soil inocula collected from experimental field plots with cropping histories of 1 to 5 years of continuous maize monoculture, where the soil type is Nicollet clay loam with moderate fertility. We measured the biomass, yield, root traits and leaf nutrients of maize as well as eukaryotic soil organisms.
Results
Inoculation with living soil dramatically reduced maize biomass and yield compared to inoculation with sterilized soil, showing CM to have strong negative soil biotic legacy effects on maize. Nonetheless, the strength of soil biotic effects on most maize variables were relatively stable over time under CM. The response of maize total biomass to living soil inoculation correlated positively with arbuscular mycorrhizal (AM) fungal abundance but negatively with soil fauna abundance, whereas it did not relate with the abundance of plant pathogenetic fungi or herbivorous nematodes. The roots showed acquisitive syndromes (high specific root length but low root diameter) in sterilized soil but conservative syndromes (opposite traits) in living soil. The responses in root system structure were tightly related with AM fungal diversity and community composition.
Conclusions
Our study shows strong and stable negative effects of soil biota on maize under CM. The complex effects of soil biota on maize performance highlight the need to explore the functions of different groups of soil organisms to better understand and control negative soil legacy effects in agroecosystems.
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Acknowledgements
Special thanks to Rick Johnson, Wayne Gottschalk and Hannah Neigebauer for help in field soil sampling and transporting. This work was financially supported by the National Natural Science Foundation of China (32060260, 31870494), funds for Regents’ Professors at Northern Arizona University, and the Key Laboratory of High Water Utilization on Dryland of Gansu Province (HNSJJ-2019-05). YL and LM thank China Scholarship Council and Nancy Johnson for supporting them as visiting scholars at Northern Arizona University. We thank the four anonymous reviewers for the comments on earlier versions of the manuscript.
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NCJ, YL and LM designed the study and collected field soils with the help of SC; LM and YL conducted the glasshouse and laboratory work with help of JZ, JO and NCJ; SC conducted and maintained the field experimental plots; LM and YL analyzed the data and drafted the manuscript, and all authors contributed to revisions.
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Mao, L., Liu, Y., Zhang, J. et al. Soil biota suppress maize growth and influence root traits under continuous monoculture. Plant Soil 461, 441–455 (2021). https://doi.org/10.1007/s11104-021-04848-6
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DOI: https://doi.org/10.1007/s11104-021-04848-6