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

Table 4. C pools of different biomass components in P. tabulaeformis forests.

Components	Young		Middle-aged		Immature		Mature
	(Mg C ha^–1)(%)		(Mg C ha^–1)(%)		(Mg C ha^–1)(%)		(Mg C ha^–1)(%)
Total tree	62.4±9.6^d	90.3±2.4^a	96.4±4.5^c	93.3±0.6^a	133.8±18.7^b	94.1±0.9^a	177.0±11.8^a	95.2±0.5^a
Aboveground	50.8±7.8^d	73.4±1.9^a	86.8±3.8^c	84.0±0.8^b	117.8±15.9^b	82.8±0.5^b	161.2±10.8^a	86.8±0.5^b
Tree stem	28.6±4.4^d	41.4±1.1^b	69.9±3.0^c	67.6±0.8^c	95.1±12.5^b	66.9±0.2^c	125.8±11.1^a	64.5±3.3^c
Stem wood	23.8±3.8^d	34.4±1.1^c	64.0±2.9^c	62.0±0.6^d	86.7±11.2^b	61.0±0.2^d	113.6±10.5^a	58.3±3.3^d
Stem bark	4.8±0.7^c	6.9±0.2^f	5.9±0.2^c	5.7±0.2^g	8.3±1.3^b	5.9±0.1^g	12.2±0.9^a	6.2±0.1^f
Branch	11.8±1.9^b	17.1±0.6^d	9.3±0.6^c	9.0±0.2^e	9.0±0. 2^c	6.4±0.8^fg	15.9±1.2^a	8.2±0.2^f
Needle	9.4±1.5^b	13.5±0.5^e	7.2±0.2^c	6.9±0.2^f	10.0±1.3^b	7.1±0.0^f	13. 1±1.1^a	6.7±0.3^ef
Pine cone	1.0±0.1^b	1.4±0.2^hi	0.4±0.0^b	0.4±0.0^j	3.7±2.0^b	2.5±1.0ⁱ	6.440±0.8^a	3.5±0.6^g
Roots	11.7±1.8^b	16.9±0.6^d	9.6±0.7^b	9.3±0.2^e	16.1±2.8^a	11.3±0.5^e	15.8±2.3^a	8.1±1.0^e
Total understory	1.5±0.4^a	2.2±0.5^h	0.8±0.5^b	0.8±0.6^ij	1.2±0.3^ab	0.9±0.1^jk	0.9±0.2^ab	0.5±0.1ⁱ
Total shrub	0.2±0.2^a	0.3±0.2ⁱ	0.3±0.3^a	0.3±0.3^j	0.4±0.3^a	0.3±0.2^kl	0.4±0.3^a	0.2±0.1ⁱ
Shrub foliage	0.0±0.0^b	0.0±0.0^j	0.0±0.0^ab	0.0±0.0^j	0.0±0.0^b	0.0±0.0^l	0.1±0.0^a	0.0±0.0ⁱ
Shrub branch	0.1±0.1^a	0.1±0.1^j	0.1±0.2^a	0.2±0.2^j	0.1±0.1^a	0.1±0.1^l	0.2±0.1^a	0.1±0.1ⁱ
Shrub root	0.1±0.1^a	0.2±0.2^j	0.1±0.1^a	0.1±0.1^j	0.3±0.3^a	0.2±0.2^kl	0.2±0.1^a	0.1±0.1ⁱ
Total herb	1.3±0.5^a	1.9±0.7^hi	0.5±0.3^b	0.5±0.3^j	0.8±0.1^ab	0.6±0.1^jkl	0.5±0.5^b	0.3±0.3ⁱ
Aboveground herb	0.4±0.2^a	0.6±0.3^hi	0.1±0.1^a	0.2±0.1^j	0.2±0.1^a	0.1±0.0^kl	0.2±0. 2^a	0.1±0.1ⁱ
Belowground herb	0.9±0.2^a	1.3±0.4^hi	0.4±0.2^b	0.4±0.2^j	0.6±0.1^ab	0.5±0.1^kl	0.3±0.3^b	0.2±0.2ⁱ
Forest floor	5.1±0.8^c	7.5±2.2^f	6.2±1.4^bc	6.0±1.1^g	7.1±0.5^ab	5.1±0.9^h	7.9±0.2^a	4.1±0.3^g
Undecomposed	3.1±0.4^b	4.6±1.3^g	4.0±1.0^ab	3.9±0.8^h	4.4±0.6^a	3.1±0.7ⁱ	4.6±0.2^a	2.4±0.2^gh
Semi-decomposed	1.4±0.3^b	2.0±0.6^h	1.5±0.3^b	1.4±0.2ⁱ	1.9±0.4^ab	1.4±0.4^j	2.3±0.2^a	1.2±0.1^h
Full decomposed	0.6±0.2^a	0.9±0.4^hi	0.7±0.2^a	0.7±0.2^ij	0.8±0.4^a	0.6±0.3^kl	0.9±0.3^a	0.5±0.2ⁱ

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