Carbon cycle of larch plantation based on CO2FIX model

doi:10.17521/cjpe.2015.0208

Abstract

Abstract:

Aims
Plantations play important roles in modifying regional carbon budget and maintaining regional carbon balance. In this study, we assessed larch plantation (Larix gmelinii var. principis-rupprechtii) carbon dynamics in Weichang County from a perspective of the forest biomass-soil-wood-products chain. Our objectives were to elucidate the carbon sink capacity of larch plantation and the influences of biomass, soil and wood product pools on carbon balance.
Methods
CO2FIX model was used to evaluate the carbon storage and flow of larch plantation over a time span of 120 years. Input data for model were derived from practical investigations and published papers. We validated the simulated results and found that this model was suitable in the region and the simulated results were reliable.
Important findings
(1) Soil was the largest carbon pool for larch plantation and the wood product pool had the smallest carbon storage. Meanwhile, carbon storage in wood products gradually increased with time. (2) In a rotation of 50 years from secondary poplar-birch forest to larch plantation, 250 t C·hm^-2 was sequestrated by the larch plantation. 70% of the carbon was transferred into soil in the form of litter and logging slash and the other 30% was transferred into wood products. (3) Larch plantation was a carbon sink during most of its growing period and turned to temporary carbon source when it was harvested. Larch plantation could sequestrate about 0.3 t C·hm^-2·a^-1 in the long term. Our results indicated the importance of wood product carbon pool in carbon dynamics of plantation, which facilitated our understanding in the carbon dynamics and capacity of plantation.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201604013

Key words: larch plantation, carbon cycle, CO2FIX model, carbon sequestration

Yan-Long JIA, Qian-Ru LI, Zhong-Qi XU, Wei-Guo SANG. Carbon cycle of larch plantation based on CO2FIX model[J]. Chin J Plant Ecol, 2016, 40(4): 405-415.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2015.0208

https://www.plant-ecology.com/EN/Y2016/V40/I4/405

Figures/Tables 8

References 25

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参数 Parameter	数值 Value
模拟时长 Simulation length (a)	120
轮伐期 Rotation (a)	50
土壤初始碳密度 Initial carbon content of soil (t C·hm^-2)	158
木材基本密度 Basic wood density (kg·m^-3)	LP							UD
木材基本密度 Basic wood density (kg·m^-3)	540							450
含碳率 Carbon content (%)	树干 Stem		枝 Branch					叶 Leaf				根 Root
LP	49.71		51.00					51.07				53.37
UD	50.00		50.00					50.00				50.00
周转率 Turnover rates	枝 Branch		叶 Leaf					根 Root
LP	0.05¹⁾		1					0.05
UD	0.05		1					0.15
抚育采伐过程 Thinning or harvest	林龄 Forest age (a)
抚育采伐过程 Thinning or harvest	14			21			31				45				50
LP	0.4²⁾			0.4			0.4				0.5				1
UD	0.4			0.9			1				1				1
采伐后木质林产品的分配 Product allocation for thinning and harvesting	原木 Logwood					纸浆材 Pulpwood							采伐剩余物 Slash
采伐后木质林产品的分配 Product allocation for thinning and harvesting	树干 Stem	枝 Branch			叶 Leaf	树干 Stem			枝 Branch	叶 Leaf			树干 Stem	枝 Branch		叶 Leaf
LP	0.5, 0.7³⁾	0			0	0			0	0			0.5, 0.3	1		1
UD	0, 0.6⁴⁾	0			0	0			0	0			1, 0.4	1		1
产品期望寿命 Expected life time of products (a)	长期产品LTP			中期产品MTP			短期产品STP				垃圾场废弃林产品MD				长期填埋林产品LD
产品期望寿命 Expected life time of products (a)	20			10			1				10				145

参数 Parameter	数值 Value
模拟时长 Simulation length (a)	120
轮伐期 Rotation (a)	50
土壤初始碳密度 Initial carbon content of soil (t C·hm^-2)	158
木材基本密度 Basic wood density (kg·m^-3)	LP							UD
木材基本密度 Basic wood density (kg·m^-3)	540							450
含碳率 Carbon content (%)	树干 Stem		枝 Branch					叶 Leaf				根 Root
LP	49.71		51.00					51.07				53.37
UD	50.00		50.00					50.00				50.00
周转率 Turnover rates	枝 Branch		叶 Leaf					根 Root
LP	0.05¹⁾		1					0.05
UD	0.05		1					0.15
抚育采伐过程 Thinning or harvest	林龄 Forest age (a)
抚育采伐过程 Thinning or harvest	14			21			31				45				50
LP	0.4²⁾			0.4			0.4				0.5				1
UD	0.4			0.9			1				1				1
采伐后木质林产品的分配 Product allocation for thinning and harvesting	原木 Logwood					纸浆材 Pulpwood							采伐剩余物 Slash
采伐后木质林产品的分配 Product allocation for thinning and harvesting	树干 Stem	枝 Branch			叶 Leaf	树干 Stem			枝 Branch	叶 Leaf			树干 Stem	枝 Branch		叶 Leaf
LP	0.5, 0.7³⁾	0			0	0			0	0			0.5, 0.3	1		1
UD	0, 0.6⁴⁾	0			0	0			0	0			1, 0.4	1		1
产品期望寿命 Expected life time of products (a)	长期产品LTP			中期产品MTP			短期产品STP				垃圾场废弃林产品MD				长期填埋林产品LD
产品期望寿命 Expected life time of products (a)	20			10			1				10				145

华北落叶松人工林 Larch plantation		林下植被 Understory
林龄 Forest age (a)	树干生长量 Stem growth rate (m³·hm^-2·a^-1)	林龄 Forest age (a)	树干生长量 Stem growth rate (m³·hm^-2·a^-1)
0	0.50	0	0.50
5	3.12	10	0.76
10	6.27	15	1.35
15	7.30	20	2.05
20	7.20	25	0.83
25	6.20	30	0.82
30	5.20
35	4.40
40	3.70
45	3.10
50	2.70

华北落叶松人工林 Larch plantation		林下植被 Understory
林龄 Forest age (a)	树干生长量 Stem growth rate (m³·hm^-2·a^-1)	林龄 Forest age (a)	树干生长量 Stem growth rate (m³·hm^-2·a^-1)
0	0.50	0	0.50
5	3.12	10	0.76
10	6.27	15	1.35
15	7.30	20	2.05
20	7.20	25	0.83
25	6.20	30	0.82
30	5.20
35	4.40
40	3.70
45	3.10
50	2.70

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