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Effects of nitrogen fertilization on the rhizosphere priming.
- Source :
-
Plant & Soil . May2021, Vol. 462 Issue 1/2, p489-503. 15p. 1 Diagram, 1 Chart, 5 Graphs. - Publication Year :
- 2021
-
Abstract
- 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. Methods: 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. Results: 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. Conclusions: Thus, the combination of enzyme activities and MME mediates N-regulated RPE, while N competition drives the switching of RPE mechanisms. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0032079X
- Volume :
- 462
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Plant & Soil
- Publication Type :
- Academic Journal
- Accession number :
- 150392893
- Full Text :
- https://doi.org/10.1007/s11104-021-04872-6