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摘要
The objective of this study was to present and evaluate the rate of biomass growth due to temperature changes and to identify the type of vegetation that best adapts to temperature changes in a surface flow constructed wetland (CW). The operation of the CW started in 2009 treating stream agricultural runoff from a watershed area of 221 ha which are mainly wet paddy fields. The CW is composed of seven connected cells which include a sedimentation zone, deep and shallow marshes. Five typical wetland plant species such as Acorus calamus, Oenanthe javanica, Phragmites australis, Phragmites japonica, and Typha orientalis were planted surrounding the CW. The water quality and plant biomass were monitored from April to December 2009. The mean inflow DO and pH concentration were 6.9 +/- 2.0 mg/l and 7.0 +/- 0.5, respectively during the whole season. The water and air temperature at the CW were not significantly different (T-a = 0.86T(aw); n = 15; r = 0.91; p %26lt; 0.0001). Based on the results, the optimum temperature for the growth of vegetation was at 3400 degrees C accumulated daily air temperature. The highest biomass rate was achieved during the summer season. Among the plants in the CW, the highest biomass rate (3.26 kg/m(2)) was exhibited by Typha orientalis. Relative growth rate (RGR) showed similar trend for each plant and the RGR values were highest between April and May. Findings indicated that flooding restricted the growth of most plants. In this newly CW, Typha orientalis and Phragmites australis were found to be the most suitable plants in the CW.
- 出版日期2012-1
