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Long-term manuring increases microbial carbon use efficiency and mitigates priming effect via alleviated soil acidification and resource limitation.
- Source :
- Biology & Fertility of Soils; Oct2021, Vol. 57 Issue 7, p925-934, 10p
- Publication Year :
- 2021
-
Abstract
- No fertilized soils (unfertilized and fallow treatments) and soils subjected to 28-year fertilization regimes, including mineral fertilization (PK and NPK) and manure amendments (NPKM and M), were incubated with or without <superscript>13</superscript>C - glucose. Results showed that compared to mineral fertilization (0.64 − 0.69), the manure amendments significantly increased microbial C use efficiency (CUE) (0.76 − 0.79), mainly due to higher soil pH, lower resource stoichiometric ratios of dissolved organic C (DOC): mineral N, DOC: available P and mineral N: available P, and lower specific activities (per microbial biomass C unit) of β-1,4-glucosidase, N-acetyl-glucosaminidase and acid phosphatase. Glucose addition increased SOC mineralization, inducing positive priming effect (PE) with lower values in the manure amendments (0.11 − 0.12 mg C g<superscript>−1</superscript> SOC) relative to mineral fertilization (0.25 − 0.55 mg C g<superscript>−1</superscript> SOC). The PE was negatively correlated with soil pH and positively associated with resource stoichiometric ratios of DOC: mineral N, DOC: available P and mineral N: available P, mainly due to microbes mineralizing SOM to release nutrients, as indicated by the positive relationships between PE and the specific activities of N-acetyl-glucosaminidase and acid phosphatase. Concluding, relative to mineral fertilization, long-term manure amendment could increase CUE and decrease PE via alleviated soil acidification and resource limitation, thus facilitating soil C sequestration. [ABSTRACT FROM AUTHOR]
- Subjects :
- SOIL acidification
ACID phosphatase
MANURES
SOIL acidity
MINERALS
SOIL amendments
Subjects
Details
- Language :
- English
- ISSN :
- 01782762
- Volume :
- 57
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Biology & Fertility of Soils
- Publication Type :
- Academic Journal
- Accession number :
- 152372911
- Full Text :
- https://doi.org/10.1007/s00374-021-01583-z