Abstract:

Comprehensive evaluation of agricultural nonpoint source pollution around six counties around Tiaoxi River was conducted by equal standard pollution loading method in 2008. The results indicated that the lose rates of COD, TN and TP were 6782%, 2875% and 342%, respectively. The equivalent standard pollution loading rates of COD, TN and TP were 6.88%, 58.3% and 34.75%, respectively. The equivalent standard pollution loading rates of animal and poultry feces, chemical fertilizer, breeding fish ponds, and domestic living sewage were 43.87%, 23.95%, 17.34% and 14.84%, respectively, which showed that the animals and poultry feces was the greatest agricultural nonpoint source of water system in Tiaoxi River drainage area．

Key words: agricultural nonpoint source pollution; equal standard pollution loading; pollution evaluation; Tiaoxi River

Key words: agricultural nonpoint source pollution, equal standard pollution loading, pollution evaluation, Tiaoxi River