Table 3. Statistical characteristics of C, N, P element contents stoichiometry of main shrubs in Central Yunnan.

Investigation level	Position	C element content/%	N element content/%	P element content/%	C/N	C/P	N/P
Shrub layer	Root	45.56	0.40	0.53	125.00	146.20	1.20
	Stem	45.87	0.43	0.48	116.00	131.50	1.20
	Leaf	47.52	1.47	1.17	34.40	54.10	1.60
Herb layer	Above-ground	40.98	1.08	1.51	43.80	40.43	0.88
	Under-ground	36.25	0.61	1.00	65.50	47.99	0.72
Litter layer		41.34	1.02	0.81	43.87	68.18	1.48