PRELIMINARY STUDY OF CARBON DENSITY, NET PRODUCTION AND CARBON STOCK IN NATURAL SPRUCE FORESTS OF NORTHWEST SUBALPINE SICHUAN, CHINA

doi:10.17521/cjpe.2007.0035

Abstract

Abstract:

Aims Carbon density, net production and carbon stock were estimated using data from natural spruce forests of Northwest Subalpine Sichuan.

Methods We harvested biomass, litter and soil carbon and calculated net production by dividing biomass by forest age.

Important findings The mean biomass of spruce forest is 230.37×10³ kg·hm^-2, with the tree layer accounting for 212.77×10³ kg·hm^-2 (92.36%). The percentage of carbon density in tree organs are stem 57.85%, bark 47.12%, branch 51.22%, leaf 48.27%, and root 52.39%. The percentage of carbon density in different strata are shrub 49.91%, herb 46.34%, duff 43.21%, litter 39.44%, and soil 1.41%. Carbon density declines with increased soil depth. The carbon stock is 273.79×10³ kg·hm^-2, divided among the tree layer with 109.30×10³ kg·hm^-2 (39.92%), shrub 5.69×10³ kg·hm^-2 (2.08%), herb 1.26×10³ kg·hm^-2 (0.46%), duff 0.60×10³ kg·hm^-2 (0.22%), litter 0.83×10³ kg·hm^-2 (0.30%), and soil (0-100 cm) 156.11×10³ kg·hm^-2 (57.01%). Therefore, the carbon stocks are ordered: soil (0-100 cm) > tree layer > shrub > herb > litter > duff. Mean net production is 6 838.5 kg·hm ^-2·a^-1, with the tree layer accounting for 4 676 kg·hm^-2·a^-1 (68.38%). Mean annual carbon sequestration is 3 584.98 kg·hm^-2·a^-1, with the tree layer accounting for 2 552.99 kg·hm^-2·a^-1 (71.21%).

Key words: spruce forests, carbon density, net primary production, carbon stock

MA Ming-Dong, JIANG Hong, LUO Cheng-De, LIU Yao-Jian. PRELIMINARY STUDY OF CARBON DENSITY, NET PRODUCTION AND CARBON STOCK IN NATURAL SPRUCE FORESTS OF NORTHWEST SUBALPINE SICHUAN, CHINA[J]. Chin J Plant Ecol, 2007, 31(2): 305-312.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2007.0035

https://www.plant-ecology.com/EN/Y2007/V31/I2/305

Figures/Tables 13

References 19

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林分变量 Stand variables	统计值 Statistical value
林分变量 Stand variables	最小值 Minimum	最大值 Maximum	平均值 Average	标准差 Standard derivation
年龄 Age	27	150	59.35	38.96
平均直径 Average diameter breast height (cm)	9.0	23.2	18.92	4.17
平均树高 Average height (m)	6.1	20.6	14.53	3.62
每公顷株数 Timber stocking per hectare (株·hm^-2)	325	4 500	1 096	568
每公顷蓄积量 Timber stocking per hectare (m³·hm^-2)	32.66	898.06	180.1	112.26
林分郁闭度 Stand closure (P)	0.4	0.9	0.68	0.10

林分变量 Stand variables	统计值 Statistical value
林分变量 Stand variables	最小值 Minimum	最大值 Maximum	平均值 Average	标准差 Standard derivation
年龄 Age	27	150	59.35	38.96
平均直径 Average diameter breast height (cm)	9.0	23.2	18.92	4.17
平均树高 Average height (m)	6.1	20.6	14.53	3.62
每公顷株数 Timber stocking per hectare (株·hm^-2)	325	4 500	1 096	568
每公顷蓄积量 Timber stocking per hectare (m³·hm^-2)	32.66	898.06	180.1	112.26
林分郁闭度 Stand closure (P)	0.4	0.9	0.68	0.10

层次 Layers	组分 Component	碳密度 Carbon density (%)
枯落物 Litter	未分解枯落物Under composed litter	48.34
	半分解枯落物Semi decomposed litter	45.26
	已分解枯落物Decomposed litter	24.69
	平均Average	39.44
土壤层 Soil layer	0~20 cm	2.69
	20~40 cm	1.47
	40~60 cm	1.12
	60~80 cm	0.94
	80~100 cm	0.83
	平均Average	1.41

层次 Layers	组分 Component	碳密度 Carbon density (%)
枯落物 Litter	未分解枯落物Under composed litter	48.34
	半分解枯落物Semi decomposed litter	45.26
	已分解枯落物Decomposed litter	24.69
	平均Average	39.44
土壤层 Soil layer	0~20 cm	2.69
	20~40 cm	1.47
	40~60 cm	1.12
	60~80 cm	0.94
	80~100 cm	0.83
	平均Average	1.41

组分 Component	生物量Biomass (×10³ kg·hm^-2)	碳密度 Carbon density (%)	碳贮量Carbon stock (×10³ kg·hm^-2)	碳贮量百分比 Percentage of carbon stock (%)
乔木层Arborous layer	212.77	57.85~47.12(51.37)	118.67	41.91
灌木层Shrub layer	11.40	49.91	5.69	2.01
草本层Herb layer	2.71	46.34	1.26	0.44
地被物层Ground cover layer	1.38	43.21	0.60	0.21
枯落物层Litter layer	2.11	48.38~24.69(39.44)	0.83	0.29
土壤层Soil layer
0~20 cm	2 046	2.69	55.04	19.44
20~40 cm	2 137	1.47	31.41	11.10
40~60 cm	2 350	1.12	26.32	9.30
60~80 cm	2 413	0.94	22.68	8.00
80~100 cm	2 489	0.83	20.66	7.30
合计Total			283.16	100.00