Abstract: The effect of the conventional fertilization on runoff and nutrient losses in field conditions was investigated through setting runoff plots in tea plantation ecosystem in West Lake. The results showed that total nitrogen (TN)and total phosphorus (TP) concentration were 5.47 mg·L-1and 0.48 mg·L-1,respectively, in the period from July 2010 to June 2011, which indicated that surface runoff into the water would result in water entrophication. The results also suggested that soluble nitrogen was the main form of runoff nitrogen loss in the tea plantation system. The runoff and total nitrogen phosphorus losses were highly correlated with the precipitation during the period, suggesting that it can reduce nitrogen and phosphorus loss in the surface soil in the condition of less fertilizer, avoiding fertilization before raining, and trenching fertilization．

Key words: tea plantation, runoff, nitrogen and phosphorus, loss