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Soil microbial biomass phosphorus can serve as an index to reflect soil phosphorus fertility
Biology and Fertility of Soils ( IF 5.1 ) Pub Date : 2021-04-10 , DOI: 10.1007/s00374-021-01559-z
Yi Peng , Yisheng Duan , Weige Huo , Minggang Xu , Xueyun Yang , Xihe Wang , Boren Wang , Martin S. A. Blackwell , Gu Feng

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.



中文翻译:

土壤微生物量磷可作为反映土壤磷肥力的指标

在祁阳,杨凌和乌鲁木齐不同土壤和气候特征的三个长期土壤肥力试验中,研究了碳和磷输入对土壤微生物生物量磷(MBP)积累的影响和相对贡献。三个地点的土壤MBP最大值为47.8 mg P kg -1。每单位土壤中的MBP累积量(mg P kg -1土壤)与Olsen P增加4.91 mg kg -1相关。对于每单位增加的P过剩量(kg P ha -1),粪肥C(kg C ha -1)和留茬C(kg C ha -1),MBP积累量增加了330、3.7和13个单位(μgP kg -1土壤)。土壤MBP与作物产量和磷素吸收呈正相关,使土壤MBP成为有用的土壤磷肥力指数。土壤MBP池的临界水平140千克公顷-1,57-62公斤公顷-1,和33-35公斤公顷-1在酸性红壤,垆土,和灰漠土,分别。这是第一份基于土壤MBP库建立土壤肥力定量指标的报告。我们的发现表明,碳输入是土壤MBP积累的良好驱动力。将土壤MBP作为土壤磷肥力的指标整合到农业磷肥管理中,对于帮助管理矿物磷肥作为可持续农业实践的一部分非常有用。

更新日期:2021-04-11
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