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Stoichiometric analysis of an arable crop–soil–microbe system after repeated fertilizer and compost application for 10 years

  • Soils, Sec 5 • Soil and Landscape Ecology • Research Article
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Abstract

Purpose

Little is known about the impact application of fertilizer and manure nutrients on the nutrient stoichiometry of crop–soil–microbe systems. We ask the question to what extent the nutrient availability in the microbe–soil–plant system may be affected by the application of fertilizers or manures.

Methods

The influence of application of inorganic fertilizers or composted manure on the concentrations of carbon (C), nitrogen (N), and phosphorus (P) and their stoichiometric ratios in soil, microbial biomass, enzymes, and plant tissues within the rhizosphere of maize was investigated in a maize–wheat rotation established for 10 years in China.

Results

The higher rate of composted manure was most effective in increasing soil C, N, and P contents and the microbial biomass. Microbes changed biomass stoichiometry instead of regulating related enzyme secretion under different nutrient supplies. Although plants and microbes showed tight but different relationships with the two nutrient sources, competition for N consistently occurred. Pearson’s inter-correlation demonstrates stable Redfield-like C:N:P fractions existed in soil properties and related enzyme activity, but was not always found in crop and microbial biomass after fertilizer and manure application.

Conclusions

The results indicate that soil microbial functioning and coupled feedback with the plants are important in maintaining the stability of fertilized/manured agricultural ecosystems.

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Funding

This study was funded by the National Key Research and Development Program of China (2017YFD0200200) and the National Natural Science Foundation of China (41877049; 41271269).

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Correspondence to Jingping Gai.

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No informed or ethical consent was required for this research.

Conflict of interest

The authors declare no competing interests.

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Responsible editor: Jizheng He

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Yang, Y., Ji, R., Zhang, H. et al. Stoichiometric analysis of an arable crop–soil–microbe system after repeated fertilizer and compost application for 10 years. J Soils Sediments 21, 1466–1475 (2021). https://doi.org/10.1007/s11368-021-02896-0

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  • DOI: https://doi.org/10.1007/s11368-021-02896-0

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