亚热带不同林龄马尾松林地上器官植硅体碳封存潜力

doi:10.11707/j.1001-7488.20201202

Abstract

Abstract:

Objective: This study reveals the phytolith and phytolith occuluded carbon (PhytOC) storage in the aboveground organ of Pinus massoniana plantations at different stand ages in subtropical China, and measures the PhytOC sequestration potential in P. massoniana plantations, and provides a scientific basis for long-term carbon sequestration research in P. massoniana plantations. Method: We used a chronosequence approach to examine the effect of stand age on the above-ground part of plant PhytOC storage by sampling 15, 24, 36, 55, and 63 a P. massoniana stands. Phytoliths were extracted by microwave digestion method, and the C concentration in phytoliths was determined. Result: The distribution of phytolith and PhytOC concentrations in above-ground biomass of P. massoniana varied among different organs of the pine trees (P < 0.05). Phytolith concentration decreased in the order of leaf (1.829 g·kg^-1) > branch (0.771 g·kg^-1) > trunk (0.452 g·kg^-1). PhytOC concentration decreased in the order of leaf (0.357 g·kg^-1) > branch (0.172 g·kg^-1) > trunk (0.104 g·kg^-1). Both phytolith and PhytOC concentrations in leaves and branches were affected by age (P < 0.05), while no differences were observed for C in per unit of phytolith in the above-ground biomass (P>0.05). Phytolith concentration in leaves differed with stand age in the order:55 a (2.358 g·kg^-1) > 63 a (1.923 g·kg^-1) > 36 a (1.719 g·kg^-1) > 24 a (1.655 g·kg^-1) > 15 a (1.489 g·kg^-1). Leaf phytolith concentrations were negatively correlated with concentrations of available silicon (R²=0.27, P < 0.05) and pH (R²=0.45, P < 0.05) in the 0-10 cm soil layer. PhytOC storage in branches and trunks accounted for 20.7% and 69.2% of the total storage, respectively. PhytOC storage in above-ground biomass was affected by age and decreased in the order of 55 a (15.97 kg·hm^-2) > 63 a (15.54 kg·hm^-2) > 36 a (10.63 kg·hm^-2) > 15 a (10.46 kg·hm^-2) > 24 a (10.13 kg·hm^-2). The annual PhytOC sequestration rate in the above-ground part of Masson pine stands was affected by age, decreasing in the order as follows:15 a (10.94 kgCO₂·hm^-2a^-1) > 24 a (9.97 kgCO₂·hm^-2a^-1) > 36 a (7.20 kgCO₂·hm^-2a^-1) > 55 a (5.10 kgCO₂·hm^-2a^-1) > 63 a (4.76 kgCO₂·hm^-2a^-1). Conclusion: Both plant organ and age significantly affected the phytolith and PhytOC concentrations (P < 0.05). Taking the area of 1.20×10⁷ hm² of P. massoniana stands in subtropical China and the mean PhytOC production flux of 7.58 kgCO₂·hm^-2a^-1, it was estimated approximately 91 000 t CO₂·a^-1 being sequestered in P. massoniana phytoliths.

Key words: Pinus massoniana, above-ground apart, PhytOC, PhytOC sequestration potential

CLC Number:

S153

Kai Sun,Jiasen Wu,Weixing Sheng,Peikun Jiang,Yunqing Zhang,Jiangfei Ge. Potential of Phytolith-Occluded Organic Carbon Sequestration in Masson Pine Stands at Different Ages in Subtropical China[J]. Scientia Silvae Sinicae, 2020, 56(12): 10-18.

Figures/Tables 6

Table 1

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Table 2

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林龄 Stand age/ a	海拔 Altitude/ m	坡向 Slope aspect	坡度 Slope gradient/ (°)	郁闭度 Canopy density	密度 Density/ hm^-2	平均胸径 Mean DBH/ cm	平均高 Mean height/m
15	200	东 East	40	0.40	1 508	12.07	9.57
24	130	东北 Northeast	34	0.40	1 608	12.73	11.83
36	150	东南 Southeast	30	0.50	1 025	15.53	12.80
55	200	南 South	19	0.50	517	23.43	19.07
63	160	西 West	30	0.50	608	23.87	17.93

土层 Layer/cm	林龄 Stand age/a	密度 Density/ (g·cm^-3)	pH	有机质含量 Organic matter content/ (g·kg^-1)	有效硅含量 Available Si content/ (mg·kg^-1)
0~10	15	1.34±0.07	4.82±0.03	27.73±5.28	12.65±2.17
	24	1.27±0.20	4.52±0.03	20.03±1.29	9.33±1.38
	36	1.40±0.15	4.42±0.10	16.20±3.63	4.12±0.63
	55	1.43±0.03	4.20±0.12	17.77±6.46	5.12±1.83
	63	1.53±0.14	4.36±0.20	18.90±0.26	4.22±0.60
10~30	15	1.42±0.05	4.84±0.01	13.23±8.27	13.76±1.82
	24	1.36±0.17	4.54±0.11	12.20±1.80	12.00±1.37
	36	1.40±0.09	4.53±0.10	12.43±4.51	5.93±1.22
	55	1.53±0.13	4.33±0.21	10.30±2.60	6.33±2.71
	63	1.50±0.14	4.46±0.16	7.67±1.33	6.23±2.18

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Potential of Phytolith-Occluded Organic Carbon Sequestration in Masson Pine Stands at Different Ages in Subtropical China

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