. 2014 Apr 15;9(4):e94966. doi: 10.1371/journal.pone.0094966

Table 3. Biomass of different ecosystem components in P. tabulaeformis forests.

Components	Biomass (Mg·ha^–1)
	Young	Middle-aged	Immature	Mature
Total tree	123.8±19.2^d	189.3±8.6^c	259.8±32.1^b	344.8±26.2^a
Aboveground	101.3±15.7^d	170. 5±7.4^c	228.8±27.0^b	314.4±21.0^a
Tree stem	58.0±9.0^d	136.7±5.8^c	183. 3±24.2^b	243.8±21.5^a
Stem wood	45.9±7.3^d	122.8±5.5^c	163.1±21.1^b	213.6±19.7^a
Stem bark	12.1±1.8^c	13.9±0.4^c	20.3±3.1^b	30.1±2.2^a
Branch	21.8±3.4^b	17.8±1. 2^bc	16.6±0.4^c	29. 6±2.2^a
Needle	19.3±3.1^bc	15.0±0.4^c	20.6±2.7^b	26.9±2.4^a
Pine cone	2.2±0.2^b	1.02±0.1^b	8.2±4.4^b	14.2±1.7^a
Roots	22.4±3.5^b	18.7±1.3^b	31.0±5.4^a	30.5±4.4^a
Total understory	3.5±0.9^a	1.8±1.1^b	2.8±0.5^ab	2.0±0.6^ab
Total shrub	0.4±0.4^a	0.6±0.5^a	0.8±0.7^a	0.9±0.5^a
Shrub foliage	0.0±0.0^b	0.1±0.1^ab	0.0±0.0^b	0.1±0.1^a
Shrub branch	0.1±0.1^a	0.3±0.3^a	0.2±0.2^a	0.3±0.3^a
Shrub root	0.2±0.2^a	0.2±0.2^a	0.6±0.6^a	0.4±0.2^a
Total herb	3.1±1.1^a	1.2±0.6^b	2.0±0.3^ab	1.2±1.2^b
Aboveground herb	1.0±0.5^a	0.3±0.2^a	0.4±0.1^a	0. 5±0.4^a
Belowground herb	2.1±0.6^a	0.9±0.4^b	1.6±0.2^ab	0.7±0.7^b
Forest floor	14.9±2.5^b	17.5±4.0^b	20.0±2.7^ab	23.0±0.9^a
Undecomposed	6.6±1.0^b	8.7±2.2^ab	9.3±1.2^a	9.7±0.4^a
Semi-decomposed	4.9±1.0^b	5.2±1.0^b	6.5±1.3^ab	8.2±0.7^a
Full decomposed	3.4±1.1^a	3.6±1.2^a	4.1±2.2^a	5.1±1.6^a

Data are presented as the mean value ± the standard deviation (SD). Mean values of biomass within a row followed by different lowercase letters are significantly different at p<0.05.