Abstract
The effect and relative contributions of C and P inputs on soil microbial biomass P (MBP) accumulation were studied in three long-term soil fertility experiments with various soil and climate characteristics at Qiyang, Yangling, and Wulumuqi. The maximum of soil MBP in all three sites was 47.8 mg P kg-1. The MBP accumulated per unit in soil (mg P kg-1 soil) was correlated with a 4.91 mg kg-1 increase in Olsen P. For each unit increase in P surplus (kg P ha-1), manure C (kg C ha-1), and stubble C (kg C ha-1), MBP accumulation increased by 330, 3.7, and 13 units (μg P kg-1 soil), respectively. The soil MBP was positively correlated with crop yield and P uptake, making the soil MBP a useful soil P fertility index. The critical levels of the soil MBP pool were 140 kg ha-1, 57–62 kg ha-1, and 33–35 kg ha-1 in acidic red soil, loessial soil, and grey desert soil, respectively. This is the first report to establish a quantitative index of soil fertility based on the soil MBP pool. Our findings demonstrate that C input is a good driver of soil MBP accumulation. Integration of the soil MBP as an index of soil P fertility into agricultural P management is useful to help manage mineral P fertilizers as part of sustainable agricultural practices.
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23 April 2021
A Correction to this paper has been published: https://doi.org/10.1007/s00374-021-01563-3
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This study is financially supported by the National Natural Science Foundation of China (U1703232) and the National Key R&D Program of China (2017YFD0200200).
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Gu Feng and Minggang Xu designed the study. Yisheng Duan, Weige Huo, Xueyun Yang, Xihe Wang, and Boren Wang performed the sampling and analysis. Yi Peng and Gu Feng prepared data set and performed statistical analyses. Yi Peng, Gu Feng, Martin S.A. Blackwell, and Minggang Xu contributed to statistical interpretation of results and wrote the manuscript. Gu Feng contributed to revise the manuscript and provided financial support. All authors read and approved the final manuscript.
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Peng, Y., Duan, Y., Huo, W. et al. Soil microbial biomass phosphorus can serve as an index to reflect soil phosphorus fertility. Biol Fertil Soils 57, 657–669 (2021). https://doi.org/10.1007/s00374-021-01559-z
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DOI: https://doi.org/10.1007/s00374-021-01559-z