Influencing factors of biomass accumulation and allocation of Abies fargesii var. faxoniana seedlings in the subalpine region of western Sichuan, China

doi:10.17521/cjpe.2024.0018

Abstract

Abstract:

Aims The natural regeneration of Abies fargesiivar. faxoniana is crucial for the ecological restoration of natural secondary forests in the subalpine region of western Sichuan. The study of the key factors in the biomass accumulation and allocation of seedlings is helpful to understand the mechanism of regeneration. Therefore, our objective is to reveal the critical factors for the biomass accumulation of A. fargesiivar. faxoniana seedlings in the Betula albosinensis broadleaf forests (BB), B. albosinensis- A. fargesii var. faxoniana needleleaf-broadleaf forests (BA), and A. fargesii var. faxoniana primary forests (AP).

Methods We compared the biomass allocation patterns of A. fargesiivar. faxoniana seedlings in different forest types and investigated allometric relationships between different organs by a standardized major axis regression analysis. We revealed the relationships between seedlings’ biomass and habitat factors through a redundancy analysis followed by a quantitative decomposition of the contribution of influencing factors.

Important findings The root biomass fraction (30.3%) and stem biomass fraction (43.3%) in the AP forest were significantly higher than that in the BA and BB forests. Correspondingly, leaf biomass fraction (26.4%) in the AP forest was significantly lower than that in the BA and BB forests. Seedlings in the BB forest showed an isometric relationship among three organs: roots, stems, and leaves. In the BA and AP forests, seedlings exhibited an isometric relationship between leaves and roots. In contrast, allometric relationships were observed between leaves and stems and between roots and stems. The annual biomass increment of seedlings was the highest in the western slope habitats compared to those on the northeast, north, and northwest slopes. The contribution rate of the slope aspect (20.9%) to seedling biomass accumulation and allocation surpassed that of altitude (18.1%), with substrate type (15.8%), moss cover density (11.7%) and thickness (7.7%), and canopy coverage (7.4%) ranking the top four among microhabitat factors. This study can assist in the management of Minjiang fir regeneration and the technical optimization of structures of secondary subalpine forests in western Sichuan.

Key words: Abies fargesii var. faxoniana seedlings, biomass allocation, allometric growth, redundancy analysis, microhabitat factors

TAO Qiong, MIAO Ning, YUE Xi-Ming, LUO Jian-Qiong, XUE Pan-Pan, WANG Hui. Influencing factors of biomass accumulation and allocation of Abies fargesii var. faxoniana seedlings in the subalpine region of western Sichuan, China[J]. Chin J Plant Ecol, 2024, 48(11): 1459-1470.

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Figures/Tables 8

References 48

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林分类型 Forest type	样点 Sample site	样点编号 Site code	背景 Background	乔木层 Tree layer	灌木层 Shrub layer	草本层 Herb layer	坡向 Aspect slope	坡度 Slope (°)	海拔 Altitude (m)	样本量 Sample size
BB	SHG	1	盖度 Coverage (%)	70	35	85	NW	25-28	3 396	45
BB	SHG	1	平均高度 Average height (m)	13	3.5	0.4	NW	25-28	3 396	45
BA	272	2	盖度 Coverage (%)	60	35	70	N	25-35	3 258	72
BA	272	2	平均高度 Average height (m)	14	3.5	0.4	N	25-35	3 258	72
AP	189	3	盖度 Coverage (%)	70	20	45	N	35-37	3 995	44
	189	4	平均高度 Average height (m)	12	2.0	0.3	N	35-40	3 793	44
	SJB	5	盖度 Coverage (%)	47	25	27	W	32-35	3 958	44
	SJB	6	平均高度 Average height (m)	12	2.0	0.2	W	27-30	3 793	45
	295	7	盖度 Coverage (%)	60	50	40	NW	30-33	3 974	43
	295	8	平均高度 Average height (m)	10	4.0	0.3	NW	30-33	3 812	45
	JBG	9	盖度 Coverage (%)	65	25	10	NE	35-38	4 008	45
	JBG	10	平均高度 Average height (m)	13	5.0	0.1	NE	30-35	3 780	45

林分类型 Forest type	样点 Sample site	样点编号 Site code	背景 Background	乔木层 Tree layer	灌木层 Shrub layer	草本层 Herb layer	坡向 Aspect slope	坡度 Slope (°)	海拔 Altitude (m)	样本量 Sample size
BB	SHG	1	盖度 Coverage (%)	70	35	85	NW	25-28	3 396	45
BB	SHG	1	平均高度 Average height (m)	13	3.5	0.4	NW	25-28	3 396	45
BA	272	2	盖度 Coverage (%)	60	35	70	N	25-35	3 258	72
BA	272	2	平均高度 Average height (m)	14	3.5	0.4	N	25-35	3 258	72
AP	189	3	盖度 Coverage (%)	70	20	45	N	35-37	3 995	44
	189	4	平均高度 Average height (m)	12	2.0	0.3	N	35-40	3 793	44
	SJB	5	盖度 Coverage (%)	47	25	27	W	32-35	3 958	44
	SJB	6	平均高度 Average height (m)	12	2.0	0.2	W	27-30	3 793	45
	295	7	盖度 Coverage (%)	60	50	40	NW	30-33	3 974	43
	295	8	平均高度 Average height (m)	10	4.0	0.3	NW	30-33	3 812	45
	JBG	9	盖度 Coverage (%)	65	25	10	NE	35-38	4 008	45
	JBG	10	平均高度 Average height (m)	13	5.0	0.1	NE	30-35	3 780	45

变量 Variable	缩写 Abbreviation	林型 Forest type	平均值±标准误 Mean ± SE
郁闭度 Canopy coverage (%)	CC	AP	46 ± 2^c
		BA	59 ± 2^b
		BB	72 ± 1^a
灌木盖度 Shrub coverage (%)	SC	AP	18 ± 1^a
		BA	7 ± 2^b
		BB	9 ± 2^b
灌木高度 Shrub height (m)	SH	AP	0.43 ± 0.04^b
		BA	0.88 ± 0.26^a
		BB	0.32 ± 0.05^b
箭竹盖度 Fargesia coverage (%)	FC	AP	-
		BA	29 ± 3^a
		BB	4 ± 1^b
箭竹高度 Fargesia height (m)	FH	AP	-
		BA	1.38 ± 0.16^a
		BB	0.22 ± 0.03^b
草本盖度 Herbage coverage (%)	HC	AP	22 ± 1^c
		BA	34 ± 3^a
		BB	27 ± 4^b
草本高度 Herbage height (m)	HH	AP	0.08 ± 0.01^b
		BA	0.23 ± 0.01^a
		BB	0.17 ± 0.02^a
苔藓盖度 Moss coverage (%)	MC	AP	88 ± 1^a
		BA	44 ± 4^b
		BB	32 ± 5^b
苔藓厚度 Moss thicknesses (cm)	MT	AP	6.62 ± 0.19^a
		BA	2.35 ± 0.16^b
		BB	2.32 ± 0.24^b
凋落物盖度 Litter coverage (%)	LC	AP	25 ± 1^b
		BA	48 ± 2^a
		BB	22 ± 2^b
凋落物厚度 Litter thicknesses (cm)	LT	AP	1.26 ± 0.07^b
		BA	2.73 ± 0.17^a
		BB	2.64 ± 0.29^a

变量 Variable	缩写 Abbreviation	林型 Forest type	平均值±标准误 Mean ± SE
郁闭度 Canopy coverage (%)	CC	AP	46 ± 2^c
		BA	59 ± 2^b
		BB	72 ± 1^a
灌木盖度 Shrub coverage (%)	SC	AP	18 ± 1^a
		BA	7 ± 2^b
		BB	9 ± 2^b
灌木高度 Shrub height (m)	SH	AP	0.43 ± 0.04^b
		BA	0.88 ± 0.26^a
		BB	0.32 ± 0.05^b
箭竹盖度 Fargesia coverage (%)	FC	AP	-
		BA	29 ± 3^a
		BB	4 ± 1^b
箭竹高度 Fargesia height (m)	FH	AP	-
		BA	1.38 ± 0.16^a
		BB	0.22 ± 0.03^b
草本盖度 Herbage coverage (%)	HC	AP	22 ± 1^c
		BA	34 ± 3^a
		BB	27 ± 4^b
草本高度 Herbage height (m)	HH	AP	0.08 ± 0.01^b
		BA	0.23 ± 0.01^a
		BB	0.17 ± 0.02^a
苔藓盖度 Moss coverage (%)	MC	AP	88 ± 1^a
		BA	44 ± 4^b
		BB	32 ± 5^b
苔藓厚度 Moss thicknesses (cm)	MT	AP	6.62 ± 0.19^a
		BA	2.35 ± 0.16^b
		BB	2.32 ± 0.24^b
凋落物盖度 Litter coverage (%)	LC	AP	25 ± 1^b
		BA	48 ± 2^a
		BB	22 ± 2^b
凋落物厚度 Litter thicknesses (cm)	LT	AP	1.26 ± 0.07^b
		BA	2.73 ± 0.17^a
		BB	2.64 ± 0.29^a

林分类型 Forest type	响应变量 Response variable	解释变量 Explanatory variable	参数 Estimate	标准误 SE	t	p
岷江冷杉原始林 Abies fargesii var. faxoniana primary forest	RMF	AS (NW)	0.44	0.15	2.93	0.004^**
		SU (soil)	0.72	0.23	3.06	0.002^**
		SH	-0.17	0.08	-2.06	0.041^*
		HC	-0.14	0.07	-2.01	0.045^*
		MT	0.25	0.08	3.22	0.001^**
	SMF	AS (W)	0.51	0.14	3.52	<0.001^***
	LMF	AS (NW)	-0.47	0.17	-2.68	0.030^*
		AS (W)	-0.58	0.18	-3.12	0.013^*
		SU (rock)	-0.90	0.35	-2.54	0.012^*
		SU (soil)	-0.64	0.23	-2.80	0.005^**
		MT	-0.19	0.07	-2.75	0.008^**
	AMI	AS (W)	0.67	0.20	3.33	0.009^**
	AMI	SH	0.20	0.08	2.51	0.012^*
红桦-岷江冷杉针阔混交林 Betula. albosinensis - Abies fargesii var. faxoniana needleleaf-broadleaf forest	RMF	MC	0.49	0.15	3.27	0.002^**
	RMF	MT	-0.65	0.31	-2.06	0.044^*
	SMF	ns
	LMF	ns
	AMI	ns
红桦阔叶林 Betula albosinensis broadleaf forest	RMF	HH	0.34	0.14	2.48	0.018^*
	SMF	ns
	LMF	HC	-0.35	0.15	-2.24	0.031^*
	AMI	CC	-0.35	0.15	-2.40	0.021^*
		FC	1.59	0.49	3.24	0.002^**
		HH	-0.29	0.12	-2.41	0.020^*