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Study on Comparison of Different Aquatic Plant on Nitrogen and Phosphorus Ecological Control Measures in Drainage Ditch of Farmland in Southern China

A small red soil catchments in subtropical region or southern China was selected as a study area.Six typical perennial aquatic plant species,including Canna indica,Myriophyllum spicatum,Sparganium stoloniferum,Juncus effusus,Hydrocotyle vulgaris and Oenanthe javanica were selected and planted in a small drainage ditch(2.0 m wide×1.0 mdepth).The results showed that,the effects of ecological control were significantly different(P0.01) among the 6 species.The total biomass ranged from 0.58kg/m2 to 2.32 kg/m2,in which C.indica had the greatest one,but O.javanica had the lowest one associated with its dormancy period in summer.The N and P contents(dry-based) in the biomass ranged from 8.06 g N/kg to 16.39 g N/kg,and from 1.34 g P/kg to 3.82 g P/kg,respectively,for aboveground part,and from 5.83 g N/kg to 10.80g N/kg and 1.34 g P/kg～3.35 g P/kg for underground part.Compared with other plant species,C.indica had the highest enrichment capability(23.90g/m2) for N while S.stoloniferum had the highest enrichment capability(4.04 g/m2) for P.We concluded that C.indica and S.stoloniferum have obvious advantages for N and P enrichment in the local ecological interception.The biomass can also be used as the forage for herbivore breeding or biomass incorporation to upland for the purpose of nutrient recycling and environmental protection.