7SZCZEPANSKI A J. Allelopathy as a Means of Biological Control of Water Weeds [ J ]. Aquatic Botany, 1977, 3 : 193 - 197.
8WHITE K D. Enhancement of Nitrogen Removal in Subsurface Flow Constructed Wetlands Employing a 2- stage Configuration, an Unsaturated Zone, and Recircu- lation [J]. Water Science and Technology, 1995, 32 (3) : 59 -67.