期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 23, 期 21, 页码 21377-21384出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-016-7363-0
关键词
Periphyton; Phosphorus; Bioavailability; Paddy field
资金
- State Key Basic Research Program of China [2015CB158200]
- National Natural Science Foundation of China [41422111]
- Natural Science Foundation of Jiangsu Province, China [BK20150066]
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.
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