Differentiating Bacterial Community Responses To Long-Term Phosphorus Fertilization In Wheat Bulk And Rhizosphere Soils On The Loess Plateau
APPLIED SOIL ECOLOGY(2021)
摘要
Mineral phosphorus (P) fertilizers are frequently applied to fields to support high crop yields, but long-term P input changes soil chemical and biological fertility. In the present study, based on a long-term P experiment (with three P levels (0 (P0), 50 (P50), and 100 (P100) kg P2O5 ha(-1) yr(-1))), we evaluated the effects of P input on the bacterial community in wheat bulk (BS) and rhizosphere (RS) soils. Compared to the control (P0), the P50 and P100 treatments significantly (P < 0.05) increased soil available P (AP) in the BS and RS, but they did not affect the numbers of observed species or diversity, and these indices were significantly lower in the RS than in the BS. Additionally, P fertilization changed the bacterial community compositions in both RS and BS, with minor changes in the RS but major changes in the BS; the bacterial community in the RS was different from that in the BS, with weaker network complexity but closer relationships among the bacterial taxa. An average of 2.95% of all the analyzed genes were involved in P metabolism, with a higher abundance in RS than in BS samples; however, no differences among the three treatments were observed in the BS or RS samples. In conclusion, longterm P fertilization had little impact on bacterial community diversity but changed the community compositions in wheat BS and RS; the changes in the bacterial community and functional profiles in the rhizosphere soil were mainly mediated by roots, which could help supply more available P to the plants.
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关键词
Phosphate fertilizer, 16S rRNA gene community, Bulk soil, Rhizosphere soil, Wheat cultivation
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