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

Table 3

The variations of the nitrogen concentrations in Yellow River and Fen River Basins during January to December in 2019.

Nitrogen (mg/L)	Month
NH3-N	1	2	3	4	5	6	7	8	9	10	11	12
Yellow River	4.26	3.66	2.64	1.75	2.11	1.50	1.58	0.53	0.54	0.72	0.92	2.05
Fen River	10.41	8.99	5.56	4.78	5.85	3.51	0.95	2.10	1.78	1.45	3.34	2.42
Eastern Loess Plateau	8.76	7.67	4.74	3.79	4.62	2.92	1.40	1.55	1.31	1.26	2.45	2.62
TN	1	2	3	4	5	6	7	8	9	10	11	12
Yellow River	12.30	12.54	9.07	12.68	10.67	10.56	10.66	7.35	9.72	9.82	10.09	10.01
Fen River	21.96	23.67	15.23	20.51	14.40	14.91	15.62	13.58	15.85	16.63	19.44	18.07
Eastern Loess Plateau	20.03	21.49	13.85	18.89	14.05	14.42	14.70	11.84	14.37	15.04	16.71	16.14