P uptake characteristics and P removal potentials of Pilea sinofasciata grown under soils amended with swine manure

Phytoextraction for animal manure impacted soils has been an attractive method to extract excess P. A mining ecotype (ME) and a non-mining ecotype (NME) of Pilea sinofasciata were grown in soils amended with swine manure (0-50 g kg−1 soil) to investigate P uptake characteristics and the potentials of their use for P removal. Amendments of swine manure increased the biomass and P accumulation of P. sinofasciata, and the ME demonstrated greater shoot P accumulation (36.12-184.84 mg pot−1) than the NME (27.42-160.73 mg pot−1). Shoot and root P contents of P. sinofasciata were positively correlated with soil available P. Shoot P extraction ratio of the ME reached 13.40% when seedlings were grown in the presence of 25 g kg−1 soil, which increased by 31.73% compared with that of the NME. Both ecotypes of P. sinofasciata showed high P removed from the soil, maximum potential yield and P removal after the addition of swine manure. This study establishes that both ecotypes of P. sinofasciata show great abilities of P uptake and P removal from soils contaminated by swine manure, and thus P. sinofasciata is a worthy candidate for phytoextraction.