Human Activities Increase the Nitrogen in Surface Water on the Eastern Loess Plateau

Table 2

Seasonal variations of the nitrogen concentrations in Yellow River and Fen River Basins.

	Nitrogen (mg/L)
Basin	NH3-N (dry season)				TN (dry season)
	Minimum	Maximum	Mean	SD	Minimum	Maximum	Mean	SD
Yellow River	0.11	13.20	3.32	3.39	2.09	22.20	11.59	6.03
Fen River	0.12	34.10	7.35	8.11	1.47	63.10	21.25	18.20
Basin	NH3-N (wet season)				TN (wet season)
	Minimum	Maximum	Mean	SD	Minimum	Maximum	Mean	SD
Yellow River	0.22	5.71	1.21	1.74	2.75	20.60	9.52	3.81
Fen River	0.10	9.09	2.19	2.73	1.99	7.05	14.71	13.50