Table 1 Result of descriptive statistical analyses of P in rainy and dry seasons of the Yellow River. Units: mg·L−1.
Yellow River sections | Statistical parameters | TPr | TDPr | DRPr | TPd | TDPd | DRPd | |
|---|---|---|---|---|---|---|---|---|
Upper reaches | Mean±SD | 0.76±1.14 | 0.21±0.11 | 0.12±0.11 | 0.32±0.35 | 0.03±0.06 | 0.04±0.11 | |
Min | 0.03 | 0.02 | 0.01 | 0.03 | 0.01 | 0.01 | ||
Max | 6.92 | 0.36 | 0.34 | 1.80 | 0.31 | 0.55 | ||
CV | 150% | 55% | 91% | 110% | 218% | 274% | ||
Middle reaches | Mean±SD | 3.55±3.49 | 0.03±0.02 | 0.04±0.02 | 0.16±0.14 | 0.02±0.01 | 0.02±0.00 | |
Min | 0.05 | 0.01 | 0.01 | 0.06 | 0.01 | 0.01 | ||
Max | 11.98 | 0.09 | 0.07 | 0.51 | 0.06 | 0.03 | ||
CV | 98% | 72% | 48% | 83% | 67% | 27% | ||
Lower reaches | Mean±SD | 2.47±0.95 | 0.03±0.02 | 0.03±0.01 | 1.04±0.54 | 0.02±0.01 | 0.01±0.01 | |
Min | 0.28 | 0.01 | 0.01 | 0.30 | 0.01 | ND | ||
Max | 4.32 | 0.07 | 0.06 | 2.05 | 0.04 | 0.02 | ||
CV | 39% | 55% | 40% | 52% | 35% | 86% | ||
The Yellow River estuary | Mean±SD | 0.03±0.03 | ND | ND | 0.04±0.01 | 0.02±0.00 | ND | |
Min | ND | ND | ND | 0.03 | 0.02 | ND | ||
Max | 0.07 | ND | ND | 0.05 | 0.02 | ND | ||
CV | 101% | 0% | 0% | 18% | 14% | 0% | ||
The Yellow River | Mean±SD | 1.66±2.18 | 0.12±0.12 | 0.08±0.10 | 0.45±0.51 | 0.03±0.07 | 0.02±0.07 | |
Min | ND | ND | ND | 0.03 | 0.01 | ND | ||
Max | 11.98 | 0.36 | 0.34 | 2.05 | 0.57 | 0.55 | ||
CV | 132% | 102% | 121% | 114% | 264% | 309% |
