7Littlewood I G. Estimating contaminant loads in rivers., a review [R]. Institute of Hydrology, Crowmarsh Gifford, Wallingford, Oxfordshire, OX10 8BB, UK, 1992.
8Merritt W S, Letcher R A, Jakeman A J. A review of erosion and sediment transport models[J]. Environment Model Software, 2003, 18 (8/9):761-799.
9Yoshinaga I, Miura A, Hitomi T, et al. Runoff nitrogen from a large sized paddy field during a crop period [J]. Agricultural water management, 2007, 87: 217-222.
10Kim M Y, Seo M C, Kim M K. Linking hydro-meteorological factors to the assessment of nutrient loadings to streams from large-plotted paddy rice fields [J].Agricultural water management, 2007, 87: 223-228.