Shin Joung Yi, Park Seok Soon, An Kwang-Guk
Division of Urban and Environmental Advisory, Kyonggi Research Institute, Kyonggi Province, Korea.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2004;39(3):821-34. doi: 10.1081/ese-120027744.
The objective of the study was to evaluate potential nutrient removal capacities from eutrophic stream waters using two riparian plants, Phragmites japonica and Salix gracilistyla. The removal efficiencies, removal rates of nutrients (N, P), and their specific growth rate were estimated as a function of inflow loading rate and hydraulic retention time (HRT) in a hydroponic culture system. Weight specific growth rates (WSGR) of P. japonica increased by 0.015 d(-1) in the ambient concentrations of NH4-N, NO3-N, and PO4-P and increased up to 9 times higher than the control (i.e., base concentration), whereas the WSGR decreased at the higher levels of nutrients. Under the same nutrient concentrations, the WSGR in the S. gracilistyla increased up to 9 times higher than the control, and then increased slowly. Nutrient removal efficiencies of both species were higher under lower N and P concentrations and longer HRT conditions. The removal rate of P. japonica had a positive functional relation with surface loading rates of nutrients and leveled off at 3.0 g d(-1) of NH4-N, 12.5 g d(-1) of NO3-N, and 3.0 g d(-1) of PO4-P, respectively. The removal rate of S. gracilistyla also enhanced at the surface loading of 5 g d(-1) of NH4-N, 23 g d(-1) of NO3-N, and 5 g d(-1) of PO4-P, respectively, but was lower than that of P. japonica. It is concluded that the nutrient removal approach using the riparian plants may be used for efficient water quality management in the eutrophic streams with long HRT.
本研究的目的是评估两种河岸植物——芦苇（Phragmites japonica）和细柱柳（Salix gracilistyla）对富营养化溪流水体中潜在养分的去除能力。在水培系统中，根据进水负荷率和水力停留时间（HRT）估算了养分（氮、磷）的去除效率、去除率及其特定生长速率。在NH4-N、NO3-N和PO4-P的环境浓度下，芦苇的重量比生长速率（WSGR）增加了0.015 d(-1)，比对照（即基础浓度）高出9倍，而在较高养分水平下，WSGR下降。在相同养分浓度下，细柱柳的WSGR比对照高出9倍，然后缓慢增加。在较低的氮和磷浓度以及较长的HRT条件下，两种植物的养分去除效率都更高。芦苇对NH4-N、NO3-N和PO4-P的去除率分别与养分的表面负荷率呈正相关，在NH4-N为3.0 g d(-1)、NO3-N为12.5 g d(-1)、PO4-P为3.0 g d(-1)时趋于平稳。细柱柳对NH4-N、NO3-N和PO4-P的去除率分别在表面负荷为5 g d(-1)、23 g d(-1)和5 g d(-1)时也有所提高，但低于芦苇。得出的结论是，利用河岸植物的养分去除方法可用于对水力停留时间长的富营养化溪流进行有效的水质管理。
