Responses of the Benthic Diatom Community to Nutrients and the Identification of Nutrient Thresholds in Three Aquatic Ecoregions of the Huntai River,Northeast China
Benthic diatom communities and nutrient gradients were investigated from 287 sampling sites in three aquatic ecoregions(AE) of the Huntai River to characterize the spatial distribution of nutrients and the benthic diatom communities.Locally weighted scatterplot smoothing(LOWESS) was used to analyze the thresholds for nitrogen and phosphorus.The results showed that:(1) The concentration of ammonia nitrogen and total phosphorus significantly differs in the three AEs,and shows a tendency of AEⅠ < AE Ⅱ