7Johnes P J. Evaluation and Management of the Im pact of Land use Change on the Nitrogen and Phos phorus Load Delivered to port Coefficient Modeling Hydrology, 1996,183(3-4) Surface Waters: the Ex- Approach[J]. Journal of 323-349.
8Behrendt H. Inventories of Point and Diffuse Sources and Estimated Nutrient Loads-a Comparison for Dif- ferent River Basin in Central Europe[J]. Water Sci- ence and Technology, 1996,38(4-5) :99-107.
9Wischemier W H, Smith D D, United States Science and Education Administration,et al.Predicting Rainfall Erosion Losses:a Guide to Conservation planning[M].Washington D C:US Department of Agriculture Science and Education Administration,Agricultural Handlbook,1978.