5Boyle E, Collier R, Dengler A T, et al. On the chemical mass-balance in estuaries [J]. Geochim Cosmochim Acta, 1974, 38 ( 11 ) : 1719- 1728.
6Webb B W, Phillips J M, Walling D E, et al. Load estimation methodologies for British rivers and their relevance to the Loisracs (r) Programme[ J]. Sci Total Environ, 1997,194/195:379-389.
7Grimvalla A, Stalnacke P, Tonderski A. Time scale of nutrient losses from land to sea: a European perspective[J]. Ecological Engineering, 2000,14(4) :363-371.