Background and aims
It is known that nitrogen (N) input modulates the rhizosphere priming effect (RPE); however, the magnitude and driving mechanisms of priming under increasing rates of fertilizer application remain unclear.
15N-urea (control, 75 (N75), 150 (N150), 225 (N225), and 300 (N300) kg N ha−1) was applied to a plant (maize)-soil (rice paddy) system and the RPE was monitored during the trumpet period (the most active stage) of plant growth.
Addition of N decreased soil-derived CO2 emission by 21.1–49.3% in the presence of plants. The RPE declined following N input in the control−N150 as a result of low microbial C:N imbalance, which decreased enzyme activities due to low microbial N mining and microbial activation, and high microbial metabolic efficiency (MME). In contrast, the RPE increased following N input in the N150 − N300, which was attributed to the high microbial C:N imbalance causing low MME, rather than the promotion of microbial N mining or microbial activation mechanisms. The microbial C:N imbalance was the result of N competition between microorganisms and plants.
Thus, the combination of enzyme activities and MME mediates N-regulated RPE, while N competition drives the switching of RPE mechanisms.
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Soil organic matter
Rhizosphere priming effect
Microbial metabolic efficiency
Water holding capacity
Microbial biomass carbon
Microbial biomass nitrogen
Dissolved organic carbon
Dissolved total nitrogen
Carbon use efficiency
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This research was financially supported by the National Key Research and Development Program of China (No. 2016YFD0300203-4) and the National Natural Science Foundation of China (No. 31870419). Z.J. and J.Y. planned and designed the research. Z.J., Y.L. and Z.Z. performed experiments and analyzed data. Z.J., J.Y. and G.A. wrote the manuscript.
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Jiang, Z., Liu, Y., Yang, J. et al. Effects of nitrogen fertilization on the rhizosphere priming. Plant Soil (2021). https://doi.org/10.1007/s11104-021-04872-6
- Plant−soil system
- Soil organic carbon mineralization
- Microbial carbon−nitrogen demand
- Plant−microorganism nitrogen competition
- Soil enzyme