Abstract
Abstract The prediction of the influence of reservoir impoundment on water quality and phytoplankton community is the basis of ecological compensation or restoration. The aim of the current study was to predict the effects of reservoir impoundment on phytoplankton and shoreline vegetation communities using the space-time substitution method. The Huangjinxia Reservoir under construction on the Han River was selected as the research object. The space-time substitution method indicated that the average values of the total phosphorus (TP) and ammonia (NH4+-N) increased from 0.049 and 0.279 mg L−1 to 0.139 and 1.132 mg L−1, respectively, after reservoir impoundment. The percentage of diatom biomass exceeded 95% before the reservoir impoundment. However, it was gradually decreased to 75% after the reservoir impoundment. Meanwhile, the biomass of Chlorophyta, Cryptophyta and Pyrrophyta increased significantly, accounting for 32, 20 and 13% of the total biomass, respectively, after reservoir impoundment. Cynodon dactylon (65.3%), Polygonum hydropiper (51.7%) and Aster subulatus (50.3%) were the dominant shoreline vegetation before the reservoir impoundment, whereas after the reservoir impoundment, the dominant species shifted to Alternanthera philoxeroides (62.3%), Lobelia chinensis (55.7%) and C. dactylon (53.9%). Our results suggested that the percentage of bloom-forming phytoplankton would gradually increase after the reservoir impoundment. In addition, A. philoxeroides, C. dactylon and L. chinensis would be the plants suitable for living in the shoreline of reservoirs in this area.
Highlights
Reservoir construction is an important means to utilize water resources and hydro-energy efficiently
The prediction of the influence of reservoir impoundment on water quality and phytoplankton community is the basis of ecological compensation or restoration
The space-time substitution method indicated that the average values of total phosphorus (TP) increased from 0.049 to 0.279 mg LÀ1 after reservoir impoundment from H3 to S3 (Figure 2(c))
Summary
Reservoir construction is an important means to utilize water resources and hydro-energy efficiently. Mhlanga et al ( ) monitored phytoplankton community in the Tugwi-Mukosi reservoir (Zimbabwe) 9 months after impoundment Their results showed that Cyanophyta, dominated by Microcystis aeruginosa and Aulacoseira granulata, was the predominant phylum accounted for 50–70% in the total phytoplankton community. Wu et al ( ) compared water quality and phytoplankton community composition between rivers and reservoirs before and after impoundment of the Three Gorges Reservoir Their results showed that the proportion of diatoms decreased significantly but dinoflagellate increased gradually after impoundment. Bi et al ( ) analyzed the variation in phytoplankton community in the Xiangxi River before and after impoundment Their results showed that phytoplankton diversity decreased after impoundment. These results showed that the variations in phytoplankton community caused by reservoir impoundment in different reservoirs showed a similar pattern, there was still much uncertainty due to differences in natural geographic conditions and species of indigenous phytoplankton
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