| Authors | Year | TN incoming (ton/yr) | TN outgoing (ton/yr) | Net TN loading (ton/yr) | TP incoming (ton/yr) | TP outgoing (ton/yr) | Net TP loading (ton/yr) |
| Kung and Ying (1991) | 1984-85 | 3167 | 2868 | 299 | 152 | 146 | 6.0 |
| Yuan and Wang (1993) | 1988 | 4278 |
|
| 255 |
|
|
| Lu et al. 2010 | 2008 | 5790 |
|
| 420 |
|
|
| Wang et al. (2013) |
| 8337 |
|
| 476.3 |
|
|