Abstract:

There are so many distinct features of rural area watershed in mountain region and plain region, so the discipline of the non-point pollution must be different. The author studied the discipline of N and P discharge in rural area in mountain region of northern Zhejiang province in Taihu lake basin and suggested some measures to treat the pollution. The results showed that the N and P source which resulted the river to be eutrophic concluded the domestic sewage, the poultry raising sewage, the runoff/drainage from paddy field and the bamboo forest and the tea plantation. In Xishan village, the N and P loads were 3604.99 t/a and 609.17 t/a, respectively. According to the contribution rate, the runoff from the bamboo forest and the tea plantation (47.59%) was the most important source of TN, and then were the poultry raising sewage (24.41%), the domestic sewage (19.94%), the runoff/drainage from paddy field (8.06%). About TP, the runoff from the bamboo forest and the tea plantation (49.59%) was the most important source, and the poultry raising sewage (24.13%), the runoff/drainage from paddy field (20.90%), the domestic sewage (5.38%) came next. People should pay attention to the pollution from the bamboo forest and the tea plantation, the poultry raising sewage, especially the bamboo forest and the tea plantations when people treat the pollution. The author suggested that restoring the stream channel, combined with the cleaning capabilities of constructed wetland, and making good use of the paddy field and the drainage ditch had a good future to reduce the N and P loads in rural area watershed in mountain regions.