title: Periphyton: an important regulator in optimizing soil phosphorus bioavailability in paddy fields.
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-1after fertilization, accounting for nearly 60 % of total phosphorus (TP) in soil. The paddy periphyton captured P up to 1.4 mg g-1with 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.
authors: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing, 210008, China. yhwu@issas.ac.cn.
authors: Yonghong
authors: Y
authors: Wu
authors: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing, 210008, China.
authors: Junzhuo
authors: J
authors: Liu
authors: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing, 210008, China.
authors: Haiying
authors: H
authors: Lu
authors: Institute of Hydrobiology, Chinese Academy of Sciences, 7 South Donghu Road, Wuhan, 430072, China.
authors: Chenxi
authors: C
authors: Wu
authors: School of Biomedical Sciences, Charles Sturt University, Wagga Wagga, NSW, 2678, Australia.
authors: Philip
authors: P
authors: Kerr
mesh_terms: D001682:Biological Availability; D017753:Ecosystem; D002523:Edible Grain / Q000254:growth & development / Q000378:metabolism; D005308:Fertilizers / Q000032:analysis*; D058086:Microalgae / Q000254:growth & development* / Q000378:metabolism; D012275:Oryza / Q000254:growth & development* / Q000378:metabolism; D010758:Phosphorus / Q000032:analysis* / Q000378:metabolism; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism
chemical_list: D005308:Fertilizers; D012987:Soil; D012989:Soil Pollutants; D010758:Phosphorus
keywords: Bioavailability; Paddy field; Periphyton; Phosphorus