Author(s)

Y. Y. Wu, P. P. Li, B. L. Wang & C. Q. Liu

Abstract

Orychophragmus violaceus, the plant of adaptability to karst, can grow in limestone soil at low concentrations of nitrogen, phosphorus in karst area. This paper reports the differences of absorption of nitrogen, phosphorus at low concentrations of cultivation liquid by Orychophragmus violaceus and Brassica juncea. In a 10mg/l of concentration of nitrogen, phosphorus respectively, Orychophragmus violaceus have greater absorption of nitrogen, phosphorus, and Brassica juncea releases nitrogen, phosphorus of plants into the cultivation liquid. In a 5mg/l of concentration of nitrogen, phosphorus respectively, Orychophragmus violaceus absorb phosphorus to a minimum concentration of 0.4 mg/l of cultivation liquid, the minimum concentration of absorption of NH4- N is 1.8 mg/l. Brassica juncea absorb phosphorus to a minimum concentration of 20.6 mg/l of the cultivation liquid, the minimum concentration of absorption of NH4-N is 22. 4 mg/l. This shows that Orychophragmus violaceus have the ability of absorption of nitrogen, phosphorus in lower concentrations and be used as floating-bed plants on decontamination and administration of eutrophication in natural bodies of water and sanitary sewage. Keywords: Orychophragmus violaceus, floating-bed plant, nitrogen, phosphorus, limestone.

Keywords

Orychophragmus violaceus, floating-bed plant, nitrogen, phosphorus, limestone.