Abstract：The effects of submerged macrophyte at different biomass levels in one-year life cycle on water quality were studied. Vallisneria natans, which was planted in greenhouse, was used in the present study. The sediment was collected from Taihu Lake and water was prepared according to the water quality of Taihu Lake. The experimental results showed that, the effects of submerged macrophyte on water quality had significant differences under different biomass levels, which were mainly influenced by Vallisneria natans from the different period in life cycle. Data were analyzed by one-way ANOVA, the results showed that, from the view of whole life cycle in one year, the treatment with biomass level of 992.00g had the highest effective on pH value of water column and adversely affected on the absorbed amount of NH4+-N and TOC. When the biomass was 496.00g, ρ(DO) always maintained a high level (approximately 8.65mg/L). The biomass of 228.00g was beneficial to the reduction of ρ(TP) in water column, but unbeneficial to the reduction of ρ(TN) and ρ(NO3--N).During the growing season, the removal rate of water nutrients kept increasing with biomass increasing until the biomass reached 2380.00g. Then, the removal rate reduced gradually. During the decomposing season, the removal rate of ρ(TN) reached maximum value when the biomass was 168.00g, while the removal rate of ρ(TP) reached minimum value when the biomass was 784.00g. In summary, 214.00g was the optimum biomass in terms of water quality, which was corresponding to the density of 118.00g/m2.
张来甲, 叶春, 李春华, 宋祥甫, 孔祥龙. 不同生物量苦草在生命周期的不同阶段对水体水质的影响[J]. 中国环境科学, 2013, 33(11): 2053-2061.
ZHANG Lai-Jia, YE Chun, LI Chun-Hua, SONG Xiang-Fu, KONG Xiang-Long. The effects of submerged macrophyte (Vallisneria natans) at different biomass levels in one-year life cycle on water quality. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(11): 2053-2061.
