| [1] | Gburek W J, Sharpley A N, Heathwaite L, et al. Phosphorus management at the watershed scale:a modification of the phosphorus index[J]. Journal of Environmental Quality, 2000, 29:130-144 |
| [1] | Gburek W J, Sharpley A N, Heathwaite L, et al. Phosphorus management at the watershed scale:a modification of the phosphorus index[J]. Journal of Environmental Quality, 2000, 29:130-144 |