Table 1. TN, TP and heavy metal concentrations in the water from the studied rivers in the Chaobai River Watershed (each concentration is the mean ± the standard deviation).

Site	TN	TP	Cr	Ni	Cu	Pb
	mg/L	µg/L	µg/L	µg/L	µg/L	µg/L
Bai River and its tributaries	2.4±1.4	17±11	1.2±1.1	1.2±1.1	3.2±4.1	1.0±1.0
Chaobai River and its tributaries	6.5±4.3	608±952	6.8±7.9	6.3±4.2	21±63	1.3±0.8