NH4C depletion in the pore water concentration and low N/P ratios (3.7 by weight) within the macrophyte biomass at the end of the growing period suggest that available N limits plant growth.

• 孔隙水浓度中NH4C的消耗和大型动植物生长末期的低氮/磷比率（重量上占百分之3.；7）表明，有效的氮元素限制了植物的生长。