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Phytoremediation has been widely used and is considered an environmentally friendly and efficient method for mitigating nitrogen (N) and phosphorus (P) loads. However, the technique is rarely employed in the Ningxia irrigation area, which suffers from serious N and P pollution. To investigate ways of protecting the aquatic environment in this region, we conducted  in - situ  experiments along an agricultural ditch in 2014 and 2015. During the pre-experiment in 2014, five single species floating-bed systems ( Zizania latifolia ,  Oryza sativa ,  Ipomoea aquatica ,  Lactuca sativa  and  Typha latifolia ) and one multi-species floating-bed system with three replicates were evaluated over about two months.  I .  aquatica  performed best with respect to biomass accumulation and nutrient storage among all plant systems. Multi-species system was not superior to single species systems: 42% and 37% of the N and P storage in the multi-species system were achieved by  I .  aquatica . In the formal experiment during 2015,  I .  aquatica  was tested again and performed excellently with respect to biomass production (1.06 kg/m 2 ), N (27.58 g/m 2 ) and P (2.34 g/m 2 ) uptake. Thus, this study demonstrated that  I .  aquatica  could be used to reduce N and P loads under saline and alkaline conditions in the Ningxia irrigation area.

The biomass accumulation and nutrient storage of five plant species in an in-situ phytoremediation experiment in the Ningxia irrigation area