Study on Rate of Roots Radial Oxygen Loss of Eight Wetland Plants

The rate of root radial oxygen loss of eight wetland plants(C.indica,Zantedeschia aethiopica Spreng,Zizania Caduciflora,Acorus calamus,Typhaangustifolia,Phragmites sp.,Sagittaria pygmaee Miq and Oenanthe stolonifera D.C.) cultivated in deoxygenated nutrient solution was determined to study sewage purification of artificial wetland by wetland plants.The results showed that the rate of root radial oxygen loss of Acorus calamus,and Phragmites sp.was 6.736μmol/(h·g·root) and 1.208μmol/(h·g·root)under the conditions of 30μmol/(m2·s) light intensity,25 ℃ and 50% humidity,and the rate of root radial oxygen loss was Acorus calamusSagittaria pygmaeeZantedeschia aethiopicaZizania CaducifloraC.indicaTyphaangustifoliaOenanthe stoloniferaPhragmites.The rate of root radial oxygen loss of 8 tested wetland plants in darkness decreased to varying degrees under the same light intensity,and the decreased range of Sagittaria pygmaee,Acorus calamus,Zantedeschia aethiopica and Typhaangustifolia,was 0.9～4.8μmol/(h·g·root) and the decreased range of other wetland plants was 0.01～0.26μmol/(h·g·root).