沟渠不同水生植物对双季稻田氮磷污染物净化效果的研究

摘要

The purifying effects of 3 kinds of aquatic macrophytes in ditch on the nitrogen and phosphorus pollutants from the paddy field of double-cropping rice at fertilization stage in the Poyang Lake area were studied .The result indicated that: as com-pared with the natural weeds , Vetiveria zizanioides L., Zizania latifolia Turcz and Nelumbo nucifera in the ditch had strong ability to degenerate the nitrogen and phosphorus pollutants , and the degrading velocity of pollutants near the water outlet of rice field was big -ger than that far away from the water outlet .Among 3 kinds of aquatic macrophytes , Nelumbo nucifera had the strongest purifying effect on the nitrogen and phosphorus pollutants , followed by Zizna ia latifolia and Vetiveria zizanioides in order .The aquatic macro-phytes had the highest purifying efficiency when they were at vigorous growth stage .%研究了沟渠内3种水生植物对双季稻田施肥期间氮、磷污染物的净化效果。结果表明：与空白杂草相比，沟渠内香根草、茭白和白莲对水稻田氮、磷污染物均具有较强的降解能力，且越靠近稻田出水口，它们的降解能力越强；3种水生植物对氮、磷污染物的降解能力总体上表现为白莲＞茭白＞香根草；处于生长旺盛期的水生植物对沟渠水体中氮、磷污染物的去除率最高。