Table 1. Root and leaf N, P concentrations and N∶P ratios for the overall plant in northern Tibet Plateau.

	Organ	n	N (mg g−1)			P (mg g−1)			N∶P
			Mean	SD	CV	Mean	SD	CV	Mean	SD	CV
Overall	Root	139	13.05	4.67	0.36	0.60	0.22	0.37	23.40	8.62	0.37
	Leaf	139	23.20	7.19	0.31	1.38	0.50	0.36	17.87	5.21	0.29