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Microbial Community Composition and Activity Controls Phosphorus Transformation in Rhizosphere Soils of the Yeyahu Wetland in Beijing, China

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posted on 09.03.2018, 14:51 by Zedong Teng, Yunyun Zhu, Min Li, Michael J. Whelan
Microorganisms in the rhizosphere of wetland plants can have a significant impact on phosphorus (P) interception. We investigated the seasonal pattern of microbial community structure and its relationship with to different P forms in the rhizosphere of three plants Scirpus planiculmis, Zizania latifolia, and Phragmites australis from the Yeyahu Wetland, China. Chloroform fumigation-extraction was used to determine the soil microbial biomass P (SMBP) and phospholipid fatty acids (PLFA) were used to characterize microbial community composition. P fractions in rhizosphere soil samples were also observed using sequential chemical fractionation. Results showed that the average total PLFA (TPLFA) contents of rhizosphere soils ranged from 34.9 to 40.7 nmol·g-1 and were highest in summer. Bacteria were predominant in the rhizospheres of all three plants, accounting for more than 63 % of TPLFA. Aerobic bacteria, represented by 16:0 PLFA, were most abundant. Both organic P (OP) and inorganic P (IP) accumulated in the rhizosphere during the winter die-back phase. Furthermore, both TPLFA and bacterial PLFA decreased with increases in highly resistant OP (HR-OP), occluded P (Oc-P) and Calcium-bound P (Ca-P). This suggests that bacteria play an important role in P transformation and can make use of various P forms. We also found that SMBP was significantly negatively correlated with labile OP (L-OP), moderately labile OP (ML-OP) and HR-OP, reflecting a high degree of cross correlation between SMBP and the PLFA indices.

History

Citation

Science of the Total Environment, 628–629, pp. 1266-1277

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/School of Geography, Geology and the Environment/Physical Geography

Version

AM (Accepted Manuscript)

Published in

Science of the Total Environment

Publisher

Elsevier

issn

0048-9697

eissn

1879-1026

Acceptance date

10/02/2018

Copyright date

2018

Available date

20/02/2019

Publisher version

https://www.sciencedirect.com/science/article/pii/S0048969718305059

Notes

The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.

Language

en

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