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摘要
To help improve our understanding of the nutrient dynamics at the interface between surface waters and groundwaters, particularly in the context of aquatic plant change, we analyzed total nitrogen (TN) and nitrate (NO3 -N) data from experiments. We assessed the effects of aquatic plant, nitrogen (N) and phosphorus (P) loading, water level on N processing. Laboratory experiments were conducted by percolating vegetated cores containing natural sediment or technical sand with artificial ground water and with either high or low levels of nutrients. 1. The results show that the growth rates of Elodea and Myriophyllum in Laboratory experiments were significantly higher in seepage treatments compared to control treatments, and final plant mass was up to 62% higher than that for plants where seepage was excluded. In areas with high groundwater discharge, a strong positive correlation was found between groundwater seepage fluxes, growth rates, and final plant mass for Elodea and Myriophyllum. The growth of Elodea and Myriophyllum was also significantly affected by groundwater seepage, but to a lesser degree than Elodea and Myriophyllum. Laboratory experiments generally showed the same trend for both Elodea and Myriophyllum and the positive influence of seeping ground water was apparently related to increased inorganic carbon supply and, to a lesser degree, improved nutrient availability. 2. The nutrient uptake capacity of Myriophyllum verticillatum was higher than that of Elodea nuttallii; Plants control the diffusion flux of nutrients through absorption. under higher concentration of nitrogen source condition, The growth of aquatic plant was better and nutrient uptake capacity of aquatic plant was stronger. 3. Under the conditions of smaller particle size of sediments and greater thickness, hyporheic zone had better prevent and control effect of nitrogen and phosphorus nutrients transport in groundwater; Small particle size of deposit in hyporheic zone can reduce nutrient flux through adsorption and blocking effect, diffusion flux peak had been delied and decreased.
- 出版日期2017
- 单位河海大学
