期刊名称：Journal of Environmental Hydrology (ältere Jahrgänge)
印刷版ISSN：1058-3912
电子版ISSN：1996-7918
出版年度：2008
卷号：16
出版社：IAEH
摘要：Three watersheds in the Cookeville, Tennessee area were selected to conduct a chemical and biological assessment of watershed water quality. Streams of 1st, 2nd and 3rd order were chosen to compare the effect of urbanization. Chloride, nitrate, sulfate, and phosphate were determined in water samples, and macroinvertebrate samples were collected. Results show higher levels of dissolved oxygen, total dissolved solids, nitrate and chloride were found in urban areas. Sulfate was found in all 1st order streams suggesting that this naturally occurring element may play a role in water quality. Sulfate is probably derived from from geologic sources. Analysis of variance showed that three watersheds had different water quality in terms of dissolved oxygen, turbidity, chloride and nitrate. The biotic index score (BIS), integrated from individual macroinvertebrate BIS numbers, shows a negative correlation with turbidity, nitrate, chloride and a positive correlation with dissolved oxygen. Compared to EPA nutrient regional measurements, turbidity, sulfate, nitrogen, and conductivity found in the watersheds are much higher suggesting that water quality does not meet current ambient water quality standards. Percent oligochaetes and chironomids (%OC) and percent EPT were found to have positive and negative correlation respectively with percent urban area.
