Changes of Growth State and Biomass of Salix babylonica in Simulated Eutrophic Water During July-October
The biennial cutting seedlings of Salix babylonica were planted in the simulated sewage from July to October, 2010 to study the changes of plant growth and biomass, taking tap water in Nanjing City as the control group ( CK). Simulated eu trophic water with different concentrations of total nitrogen as2.0, 30.0, 40.0, 80.0 mg/L and total phosphorus as 0.4, 8.0, 15.0, 25.0 mg/L were equipped in slight, mild moderate, moderate and severe degrees, according to the state' s surface water quality standard and the monitoring results of TN and TP concentrations in domestic sewage in the last 5 years in Nanjing provided by Nanjing Municipal Drainage Monitoring Station. Results showed that, during the 84-day period of the experiment, the average height, stem base diameter and leaf numbers of S. Babylonica cutting seedlings increased dis tinctively (P<0.05) , which increased by 95.37% , 42.51% , 195. 12% , respectively; while the grade of growth status increased just a little ( P>0. 05 ) , which only increased by 31. 35%. The ratio of above-ground biomass to below-ground biomass of the seedlings ranged from 2. 70 to 4. 10, and increased with increasing concentration of eutrophic water. The relative growth rate was between 0.014 3-0. 015 0 d-1 , which was higher than that of the CK. S. Babylonica shows the characteristics of fast growth, high production, and strong adaptability to eutrophic water; therefore, it can be popularized as a wetland tree species in the constructed wetland.
NETL
NSTL
万方数据
维普
