Abstract
To study sediment dredging in Pishihang Irrigation District, the largest irrigation district in China, this paper collected aquatic plants and sediment in the channel to analyze the biomass and nutrient distribution. The results were as follows: in April, the biomass at Point 3 peaked at 21.9 kg/m2 while in July and September, the biomass at Point 4 was the highest at the level of 25.1 kg/m2 and 25.6 kg/m2 respectively. The nutrient factor in sediment at Point 4 and 5 was higher than those at other points. The correlation coefficients of aquatic plant biomass with ammonia nitrogen and nitrate nitrogen were 0.81, 0.65 and 0.51 respectively. The nutrients in the sediment affecting the growth of aquatic plants mainly consisted of ammonia nitrogen, nitrate nitrogen and inorganic phosphorus. The eco-dredging project in the canal of Pishihang Irrigation District for weeding was about 20-30cm in thickness.
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