Periphyton: An important regulator in optimizing soil phosphorus bioavailability in paddy fields

Yonghong Wu, J. Liu, Haiying Lu, Chenxi Wu, P. Kerr

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Periphyton is ubiquitous in paddy field, but its importance in influencing the bioavailability of phosphorus (P) in paddy soil has been rarely recognized. A paddy field was simulated in a greenhouse to investigate how periphyton influences P bioavailability in paddy soil. Results showed that periphyton colonizing on paddy soil greatly reduced P content in paddy floodwater but increased P bioavailability of paddy soil. Specifically, all the contents of water-soluble P (WSP), readily desorbable P (RDP), algal-available P (AAP), and NaHCO3-extractable P (Olsen-P) in paddy soil increased to an extent compared to the control (without periphyton) after fertilization. In particular, Olsen-P was the most increased P species, up to 216 mg kg-1 after fertilization, accounting for nearly 60 % of total phosphorus (TP) in soil. The paddy periphyton captured P up to 1.4 mg g-1 with Ca-P as the dominant P fraction and can be a potential crop fertilizer. These findings indicated that the presence of periphyton in paddy field benefited in improving P bioavailability for crops. This study provides valuable insights into the roles of periphyton in P bioavailability and migration in a paddy ecosystem and technical support for P regulation.
Original languageEnglish
Pages (from-to)21377-21384
Number of pages8
JournalEnvironmental Science and Pollution Research
Volume23
Issue number21
DOIs
Publication statusPublished - 09 Aug 2016

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