Estimation of biomass allocation and carbon density in alpine dwarf shrubs in Garzê Zangzu Autonomous Prefecture of Sichuan Province, China

doi:10.3724/SP.J.1258.2014.00032

Abstract

Abstract:

Aims Shrub recovery is identified as a major cause of an increase in carbon stocks in terrestrial ecosystems in China, and yet there is a great uncertainty in the contribution of shrubs to the carbon sink. Our objectives were to determine the biomass allocation pattern and carbon density in alpine shrubs.
Methods We conducted investigations in 14 shrub communities in eastern Qinghai-Xizang Plateau, at 3500 m above sea level. Plant samples were collected from each plot and measured for biomass in leaves, branches and stems, and roots in laboratory; the data were used to analyze the biomass allocation and carbon density.
Important findings The mean biomass was (5.38 ± 3.30) Mg·hm^-2 in the shrub layer. There were significant differences in biomass between different shrub types, with the mean of (7.28 ± 4.96) Mg·hm^-2 for the broadleaved deciduous shrubs and (4.32 ± 1.36) Mg·hm^-2 for the leathery-leaved shrubs. The indicators of individual feature and community structure were significantly correlated with biomass per unit land area. However, these relationships were developed based on multiple community structure factors; any single factor alone was insufficient to explain the patterns of biomass variations. The patterns of biomass allocation differed significantly between different shrub types. In this study, there was more allocation of photosynthetic products to roots. The mean total community biomass was (6.41 ± 3.86) Mg·hm^-2 and the shrub layer accounted for (83.18 ± 8.14)% of the total community biomass. There were significant correlations (p < 0.05) between shrub layer biomass and herb layer biomass, between shrub layer biomass and litter layer biomass, and between shrub layer biomass and the total community biomass. The biomass of various organs were also significantly correlated (p < 0.01) with the total community biomass. The mean biomass carbon density of the shrubs was estimated at (3.20 ± 1.93) Mg·hm^-2 across the 14 communities by using biomass conversion factor method.

Key words: alpine shrubs, biomass, carbon density, Qinghai-Xizang Plateau

GAO Qiao, YANG Xiao-Cheng, YIN Chun-Ying, LIU Qing. Estimation of biomass allocation and carbon density in alpine dwarf shrubs in Garzê Zangzu Autonomous Prefecture of Sichuan Province, China[J]. Chin J Plant Ecol, 2014, 38(4): 355-365.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2014.00032

https://www.plant-ecology.com/EN/Y2014/V38/I4/355

Figures/Tables 9

References 33

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样地编号 Plot ID	调查地区 Location	群落类型 Community type	纬度 Latitude (N)	经度 Longitude (E)	海拔 Altitude (m)	坡度 Slope gradient (o)	坡向 Slope aspect (o)
1	色达县 Sêrtar County	窄叶鲜卑花 Sibiraea angustata	31.85o	100.73o	3 535	21	35
2	炉霍县 Luhuo County	窄叶鲜卑花 Sibiraea angustata	31.62o	100.23o	3 847	20	340
3	甘孜县 Garzê County	迟花矮柳-硬叶柳 Salix oreinoma-Salix sclerophylla	31.55o	99.98o	3 785	16	95
4	甘孜县 Garzê County	千里香杜鹃 Rhododendron thymifolium	31.45o	99.97o	4 198	11	340
5	甘孜县 Garzê County	草原杜鹃 Rhododendron telmateium	31.42o	99.97o	4 543	20	265
6	新龙县 Xinlong County	千里香杜鹃 Rhododendron thymifolium	31.38o	99.92o	4 115	18	342
7	德格县 Dêgê County	千里香杜鹃 Rhododendron thymifolium	31.88o	99.03o	4 122	5	190
8	白玉县 Baiyu County	草原杜鹃 Rhododendron telmateium	31.22o	99.85o	4 561	17	237
9	甘孜县 Garzê County	窄叶鲜卑花 Sibiraea angustata	31.45o	99.97o	4 212	19	36
10	新龙县 Xinlong County	草原杜鹃 Rhododendron telmateium	31.40o	99.95o	4 636	17	243
11	炉霍县 Luhuo County	巴郎柳-川滇柳 Salix sphaeronymphe-Salix rehderiana	31.72o	100.72o	3 697	26	40
12	道孚县 Dawu County	千里香杜鹃 Rhododendron thymifolium	30.55o	101.58o	3 915	10	18
13	道孚县 Dawu County	草原杜鹃 Rhododendron telmateium	30.53o	101.58o	3 947	25	357
14	康定县 Kangding County	草原杜鹃-头花杜鹃 Rhododendron telmateium-Rhododendron capitatum	30.08o	101.80o	4 214	0	180

样地编号 Plot ID	调查地区 Location	群落类型 Community type	纬度 Latitude (N)	经度 Longitude (E)	海拔 Altitude (m)	坡度 Slope gradient (o)	坡向 Slope aspect (o)
1	色达县 Sêrtar County	窄叶鲜卑花 Sibiraea angustata	31.85o	100.73o	3 535	21	35
2	炉霍县 Luhuo County	窄叶鲜卑花 Sibiraea angustata	31.62o	100.23o	3 847	20	340
3	甘孜县 Garzê County	迟花矮柳-硬叶柳 Salix oreinoma-Salix sclerophylla	31.55o	99.98o	3 785	16	95
4	甘孜县 Garzê County	千里香杜鹃 Rhododendron thymifolium	31.45o	99.97o	4 198	11	340
5	甘孜县 Garzê County	草原杜鹃 Rhododendron telmateium	31.42o	99.97o	4 543	20	265
6	新龙县 Xinlong County	千里香杜鹃 Rhododendron thymifolium	31.38o	99.92o	4 115	18	342
7	德格县 Dêgê County	千里香杜鹃 Rhododendron thymifolium	31.88o	99.03o	4 122	5	190
8	白玉县 Baiyu County	草原杜鹃 Rhododendron telmateium	31.22o	99.85o	4 561	17	237
9	甘孜县 Garzê County	窄叶鲜卑花 Sibiraea angustata	31.45o	99.97o	4 212	19	36
10	新龙县 Xinlong County	草原杜鹃 Rhododendron telmateium	31.40o	99.95o	4 636	17	243
11	炉霍县 Luhuo County	巴郎柳-川滇柳 Salix sphaeronymphe-Salix rehderiana	31.72o	100.72o	3 697	26	40
12	道孚县 Dawu County	千里香杜鹃 Rhododendron thymifolium	30.55o	101.58o	3 915	10	18
13	道孚县 Dawu County	草原杜鹃 Rhododendron telmateium	30.53o	101.58o	3 947	25	357
14	康定县 Kangding County	草原杜鹃-头花杜鹃 Rhododendron telmateium-Rhododendron capitatum	30.08o	101.80o	4 214	0	180

样地编号 Plot ID	灌木层优势种 Dominant species in shrub layer	灌木层优势种盖度 Dominant species coverage in shrub layer (%)	灌木层伴生种 Companion species in shrub layer	灌木层伴生种盖度 Companion species coverage in shrub layer (%)
1	窄叶鲜卑花 Sibiraea angustata	45	金露梅 Potentilla fruticasa	20
2	窄叶鲜卑花 Sibiraea angustata	50	迟花矮柳 Salix oreinoma	8
3	迟花矮柳、硬叶柳 Salix oreinoma, Salix sclerophylla	50	高山绣线菊、金露梅 Spiraea alpina, Potentilla fruticasa	5
4	千里香杜鹃 Rhododendron thymifolium	50	迟花矮柳、金露梅 Salix oreinoma, Potentilla fruticasa	10
5	草原杜鹃 Rhododendron telmateium	65	头花杜鹃 Rhododendron capitatum	8
6	千里香杜鹃 Rhododendron thymifolium	55	高山绣线菊、迟花矮柳 Spiraea alpina, Salix oreinoma	17
7	千里香杜鹃 Rhododendron thymifolium	55	迟花矮柳、高山绣线菊、金露梅 Salix oreinoma, Spiraea alpina, Potentilla fruticasa	12
8	草原杜鹃 Rhododendron telmateium	80	千里香杜鹃 Rhododendron thymifolium	5
9	窄叶鲜卑花 Sibiraea angustata	58	高山绣线菊、迟花矮柳、金露梅 Spiraea alpina, Salix oreinoma, Potentilla fruticasa	27
10	草原杜鹃 Rhododendron telmateium	80	-	-
11	巴郎柳、川滇柳 Salix sphaeronymphe, Salix rehderiana	70	-	-
12	千里香杜鹃 Rhododendron thymifolium	22	-	-
13	草原杜鹃 Rhododendron telmateium	40	-	-
14	草原杜鹃、头花杜鹃 Rhododendron telmateium, Rhododendron capitatum	65	-	-

样地编号 Plot ID	灌木层优势种 Dominant species in shrub layer	灌木层优势种盖度 Dominant species coverage in shrub layer (%)	灌木层伴生种 Companion species in shrub layer	灌木层伴生种盖度 Companion species coverage in shrub layer (%)
1	窄叶鲜卑花 Sibiraea angustata	45	金露梅 Potentilla fruticasa	20
2	窄叶鲜卑花 Sibiraea angustata	50	迟花矮柳 Salix oreinoma	8
3	迟花矮柳、硬叶柳 Salix oreinoma, Salix sclerophylla	50	高山绣线菊、金露梅 Spiraea alpina, Potentilla fruticasa	5
4	千里香杜鹃 Rhododendron thymifolium	50	迟花矮柳、金露梅 Salix oreinoma, Potentilla fruticasa	10
5	草原杜鹃 Rhododendron telmateium	65	头花杜鹃 Rhododendron capitatum	8
6	千里香杜鹃 Rhododendron thymifolium	55	高山绣线菊、迟花矮柳 Spiraea alpina, Salix oreinoma	17
7	千里香杜鹃 Rhododendron thymifolium	55	迟花矮柳、高山绣线菊、金露梅 Salix oreinoma, Spiraea alpina, Potentilla fruticasa	12
8	草原杜鹃 Rhododendron telmateium	80	千里香杜鹃 Rhododendron thymifolium	5
9	窄叶鲜卑花 Sibiraea angustata	58	高山绣线菊、迟花矮柳、金露梅 Spiraea alpina, Salix oreinoma, Potentilla fruticasa	27
10	草原杜鹃 Rhododendron telmateium	80	-	-
11	巴郎柳、川滇柳 Salix sphaeronymphe, Salix rehderiana	70	-	-
12	千里香杜鹃 Rhododendron thymifolium	22	-	-
13	草原杜鹃 Rhododendron telmateium	40	-	-
14	草原杜鹃、头花杜鹃 Rhododendron telmateium, Rhododendron capitatum	65	-	-

自变量 Independent variable	因变量 Dependent variable	n	模型 Model	R²	F值 F value	p值 p value
亚高山革叶灌丛与亚高山落叶阔叶灌丛 Combined subalpine leathery-leaved shrubs and subalpine broadleaved deciduous shrubs
叶生物量 LB	茎生物量 SB	14	SB = 3.168 × LB	0.849	67.469	< 0.001
叶生物量 LB	根生物量 RB	14	RB = 1.021 + 2.243 × LB	0.167	2.407	0.147
叶生物量 LB	灌木层生物量 SLB	14	SLB = 1.022 + 6.411 × LB	0.567	15.723	0.002
茎生物量 SB	根生物量 RB	14	RB = 0.841 + 0.792 × SB	0.246	3.914	0.071
茎生物量 SB	灌木层生物量 SLB	14	SLB = 0.944 + 2.060 × SB	0.692	26.943	< 0.001
灌木层地上生物量 SAGB	根生物量 RB	14	RB = 0.830 + 0.606 × SAGB	0.233	3.651	0.080
灌木层地上生物量 SAGB	灌木层生物量 SLB	14	SLB = 0.830 + 1.606 × SAGB	0.681	25.661	< 0.001
根生物量 RB	灌木层生物量 SLB	14	SLB = 1.853 + 1.385 × RB	0.797	47.212	< 0.001
亚高山革叶灌丛 Subalpine leathery-leaved shrubs
叶生物量 LB	茎生物量 SB	9	SB = -0.058 + 2.959 × LB	0.864	44.363	< 0.001
叶生物量 LB	根生物量 RB	9	RB = 2.271 - 0.817 × LB	0.240	2.209	0.181
叶生物量 LB	灌木层生物量 SLB	9	SLB = 2.213 + 3.142 × LB	0.817	31.288	0.001
茎生物量 SB	根生物量 RB	9	RB = 2.305 - 0.302 × SB	0.332	3.486	0.104
茎生物量 SB	灌木层生物量 SLB	9	SLB = 2.414 + 0.990 × SB	0.822	32.340	0.001
灌木层地上生物量 SAGB	根生物量 RB	9	RB = 2.314 - 0.228 × SAGB	0.317	3.250	0.114
灌木层地上生物量 SAGB	灌木层生物量 SLB	9	SLB = 2.314 + 0.772 × SAGB	0.843	37.457	< 0.001
根生物量 RB	灌木层生物量 SLB	9	SLB = 5.001 - 0.393 × RB	0.036	0.259	0.626
亚高山落叶阔叶灌丛 Subalpine broadleaved deciduous shrubs
叶生物量 LB	茎生物量 SB	5	SB = 0.153 + 3.464 × LB	0.928	38.572	0.008
叶生物量 LB	根生物量 RB	5	RB = -0.947 + 7.167 × LB	0.976	122.690	0.002
叶生物量 LB	灌木层生物量 SLB	5	SLB = -0.793 + 11.631 × LB	0.998	1 597.000	< 0.001
茎生物量 SB	根生物量 RB	5	RB = -0.690 + 1.845 × SB	0.836	15.345	0.030
茎生物量 SB	灌木层生物量 SLB	5	SLB = -0.681 + 3.113 × SB	0.925	36.742	0.009
灌木层地上生物量 SAGB	根生物量 RB	5	RB = -0.808 + 1.487 × SAGB	0.877	21.374	0.019
灌木层地上生物量 SAGB	灌木层生物量 SLB	5	SLB = -0.808 + 2.487 × SAGB	0.952	59.773	0.004
根生物量 RB	灌木层生物量 SLB	5	SLB = 0.877 + 1.590 × RB	0.981	155.382	0.001