Abstract
Aims
Crop straw return promotes microbial mediated phosphorus (P) cycling in soils, thereby increasing soil P availability. However, it remains unclear whether straw carbon (C) regulated organic phosphorus (Po) conversion is affected by soil P availability.
Methods
Here, the responses to straw addition of soil microbial biomass, extracellular enzyme stoichiometry, bacterial community composition and P fractions were studied in soils with different available P contents.
Results
Straw addition increased the organic P (Po) mineralization in the medium P (MP) soil, while decreased it in the low P (LP) and high P (HP) soils, respectively. Microbial nutrient limitation and community composition were co-regulated by soil C and P availability. LP and HP soils had the highest P and C limitations, respectively. In the MP soil, microbial P and C limitations lie between those of LP and HP soils. Straw addition decreased microbial P limitation in the LP and MP soils, while little change occurs in the HP soil. In addition, species number, diversity and the synergy of microbial communities were high in the MP soil. Straw addition induced a greater increase in the relative abundance of P-solubilizing microorganisms (e.g., Rhizobiales and Bradyrhizobium) in the MP soil compared to in the LP and MP soils.
Conclusions
We concluded that straw addition promotes Po mineralization when the soil Olsen-P content was between 8.1–18.9 mg kg–1 and the corresponding MBC:P ratio was between 25.6–36.9. Our results highlight that the changes in microbial nutrient limitation and community composition caused by straw addition drive different soil P conversions.
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Data Availability
Data will be made available on request.
References
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This study was funded by the National Key Research and Development Program of China (2021YFD1901200), the China Agriculture Research System of MOF and MARA (CARS-12) and the Fundamental Research Funds for the Central Universities (2662021ZH001).
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Kunkun Wang, Tao Ren and Jinyao Yan contributed to the study conception and design. The first draft of the manuscript was written by Kunkun Wang and all authors have provided comment to the paper and approved the final manuscript.
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Wang, K., Ren, T., Yan, J. et al. Soil phosphorus availability alters the effects of straw carbon on microbial mediated phosphorus conversion. Plant Soil 491, 575–590 (2023). https://doi.org/10.1007/s11104-023-06134-z
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DOI: https://doi.org/10.1007/s11104-023-06134-z