IngentaConnect Nutrients removing by arrowheads in different growing periods in ...

Abstract:

Riparian macrophytes are very effective for nutrients purification in surface water through absorption, precipitation enhancement and the biochemical functions of microbes around plants' rods and roots. In river networks of Taihu watershed in China, arrowheads distribute widely in the river riparian macrophyte buffers. Experiments were performed following three months of different growing periods including July, October and November, which indicate the blooming period, the fruit bearing period and the withered beginning period. Contents of Total Nitrogen (TN) and Total Phosphorus (TP) in water body were tested. Results show that the concentrations of these nutrients were decreased with arrowheads growing, and the degradation degree are larger while arrowhead thriving in July with the TN and TP average degradation rate of 80.5% and 87.1% after 15 days' duration. The biomass of arrowheads per square meter show logarithmic relativity to nutrient removing rates in the three periods. In addition, comparative experiments were performed to separate the contribution to the degradation of nutrients between soil absorption and the arrowhead action. Results indicate that the contents of Total Nitrogen decreased larger with plants than that of without, the difference is about 20% or so. However, arrowheads impact little on TP remove, the contents of total phosphorus decreased mainly by soil adsorption and precipitation, as a result, the final degradation rates of TP are about at the same in the two systems with or without plants.

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Nutrients removing by arrowheads in different growing periods in the transition zone between lands and rivers