Table 6 Evaluated nutrient (TN and TP) thresholds for the Qing River basin in Northeast China.
From: Estimating the nutrient thresholds of a typical tributary in the Liao River basin, Northeast China
Nutrient Threshold Evaluation Approach | Nutrient Threshold | |
|---|---|---|
TN (mg/L) | TP (mg/L) | |
Chemically Derived Approaches | ||
Reference Stream Distribution Approach | 1.288 | 0.046 |
All-Streams Distribution Approach | 0.724 | 0.024 |
Y-Intercept Approach | 0.749 | 0.035 |
Preliminarily Recommended Thresholds | 1.000 | 0.040 |
Biologically Derived Approach | ||
Stress-Response Approach based on Benthic Macroinvertebrate Community Indices | ||
EPT Relative Abundance % | 1.655 | 0.084 |
EPT Taxonomic Richness | 1.050 | 0.052 |
Modified FBI | 1.574 | 0.101 |
Diptera and Non-Insect Relative Abundance | 1.610 | 0.084 |
