Ecosystem Carbon Storage Distribution and Influencing Factors in Different-aged Poplar Plantations in the Yellow River Floodplain in Western Shandong, China

doi:10.7525/j.issn.1673-5102.2025.02.010

Abstract

Abstract:

To reveal the carbon fixation mechanism of poplar plantations with different ages and to investigate the relationship between carbon storage and environmental factors in the Yellow River Floodplain， the distribution patterns and influencing factors of carbon storage in the tree layer， herb layer， litter layer， and soil layer of grassland （CK） and four distinct-aged （10， 30， 40， 50 a） poplar plantations in the Yellow River Floodplain were examined by field surveys and indoor analysis， respectively. The results showed that the proportion of biomass in the herb layer of the poplar plantation decreased gradually， and the proportion of biomass in the tree and litter layers progressively increased with the increase of stand age. The ratio of biomass in the tree layer to total biomass was the highest （93.21% to 96.17%）， followed by the litter layer （3.99% to 3.20%）， and in the herb layer was the lowest（2.84% to 0.63%）. The average carbon content of the poplar plantations was the highest in tree layer of 50-a plantation（420.40 g⋅kg^-1）， in herb layer of 10-a plantation（365.86 g⋅kg^-1）， and in litter layer of 30-a plantation（398.67 g⋅kg^-1） and the average carbon content of soil layer increased significantly with the increase of stand age. The carbon storage of poplar plantation increased with age， and the distribution pattern was tree layer（975.81 t⋅hm^-2）>soil layer（275.06 t⋅hm^-2）>litter layer（38.01 t⋅hm^-2）>herb layer（19.19 t⋅hm^-2）， the soil layer and tree layer were the main components of carbon storage of poplar plantation， accounted for 95.31% to 97.46% of the total carbon storage. Correlation and redundancy analysis showed that tree height（H）， soil organic matter（SOM）， diameter at breast height（DBH）， and stand density （SD） were the main environmental factors influencing carbon storage in poplar plantations. The results can provide a theoretical basis and data support for the carbon sink function of poplar plantation forests and the management strategy of plantation forests in the Yellow River Floodplain.

Key words: poplar plantations, biomass, carbon storage, Yellow River Floodplain

CLC Number:

S718.55

Yuwei GUO, Jing LIANG, Haibing WU, Chuanjie ZHOU, Linlin SUN, Zhibao WANG, Xiaoru LI, Xiangfeng CHEN, Mulan LI. Ecosystem Carbon Storage Distribution and Influencing Factors in Different-aged Poplar Plantations in the Yellow River Floodplain in Western Shandong, China[J]. Bulletin of Botanical Research, 2025, 45(2): 241-253.

Figures/Tables 10

Table 1

Table 2

Table 3

Relative growth equations of biomass（ W ） and diameter at breast height（ DBH ） and tree height （ H ） of poplar tree components

器官 Organ	生物量方程 Allometric equation	R²
树干 Stem	$W = 0.014 7 (D B H 2 H) 1.025 1$	0.75
树枝 Branch	$W = 0.002 5 (D B H 2 H) 1.106 7$	0.95
树叶 Leaf	$W = 0.008 2 (D B H 2 H) 0.795 1$	0.95
树根 Root	$W = 0.007 5 (D B H 2 H) 0.964 2$	0.95

Table 3

Fig.1

Table 4

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

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林龄 Age/a	土壤容重 Soil bulk density /（g·cm^-3）	土壤含水量 Soil water content /%	田间持水量 Field capacity /（cm³·cm^-3）	土壤孔隙度 Soil porosity /%	pH	电导率 Electrical conductivity /（μs·cm^-1）
CK	1.53±0.02^a	5.14±0.27^a	0.25±0.01^a	47.43±0.60^a	8.40±0.02^a	129.87±25.02^a
10	1.48±0.01^ab	4.16±0.26^b	0.25±0.01^a	47.15±0.92^a	8.35±0.03^a	105.01±9.75^a
30	1.43±0.02^c	4.73±0.30^ab	0.27±0.01^a	47.58±0.61^a	8.04±0.04^c	106.79±14.32^a
40	1.47±0.01^bc	3.37±0.57^c	0.27±0.01^a	48.08±0.39^a	8.21±0.04^b	117.06±10.85^a
50	1.45±0.05^bc	4.93±0.58^ab	0.27±0.02^a	47.93±1.04^a	8.21±0.04^b	103.15±4.58^a
林龄 Age/a	全碳 Total carbon /（g·kg^-1）	全氮 Total nitrogen /（g·kg^-1）	全磷 Total phosphorus /（g·kg^-1）	有机质 Organic matter content /（g·kg^-1）	速效钾 Available potassium /（mg·kg^-1）
CK	2.53±0.17^d	0.39±0.01^a	0.53±0.01^a	4.36±0.29^d	49.73±3.74^a
10	2.12±0.09^e	0.32±0.01^b	0.46±0.00^b	3.59±0.21^e	43.57±1.00^b
30	3.24±0.17^c	0.33±0.01^b	0.46±0.01^b	5.59±0.30^c	40.63±1.86^b
40	3.80±0.14^b	0.37±0.03^a	0.45±0.01^b	7.70±0.08^b	51.10±2.21^a
50	7.14±0.29^a	0.39±0.03^a	0.45±0.01^b	12.31±0.51^a	52.30±2.46^a

林龄 Age/a	样方面积 Plot area/m²	林分密度 Stand density /（株·hm^-2）	胸径 Diameter at breast height/cm	树高 Tree height/m	林下植物 Understory plants
CK	400	—	—	—	芦苇（Phragmites australis），狗尾草（Setaria viridis），鬼针草（Bidens pilosa）等
10	400	916.67±52.04	24.17±0.76	21.33±0.58	芦苇（Phragmites australis），鬼针草（Bidens pilosa），木贼（Equisetum hyemale）等
30	400	450.00±25.00	36.06±1.03	32.67±0.76	芦苇（Phragmites australis），葎草（Humulus scandens），木贼（Equisetum hyemale）等
40	400	391.67±14.43	37.67±0.76	35.09±1.01	芦苇（Phragmites australis），狗尾草（Setaria viridis），葎草（Humulus scandens）等
50	400	341.67±14.43	39.83±1.04	37.83±1.04	芦苇（Phragmites australis），木贼（Equisetum hyemale），葎草（Humulus scandens）等

层次 Layer	组分 Component	CK	碳质量分数 Carbon mass fraction/（g·kg^-1）
层次 Layer	组分 Component	CK	10 a	30 a	40 a	50 a
乔木层 Tree layer	树干Stem	—	466.92±10.91^a	421.41±15.08^bc	407.85±13.71^c	443.71±10.72^ab
	树枝Branch	—	403.15±6.62^b	372.49±2.61^c	435.54±4.06^a	448.44±5.26^a
	树叶Leaf	—	423.46±12.5^b	393.49±7.21^a	435.24±11.12^a	431.22±9.96^a
	树根Root	—	370.77±0.53^c	435.61±0.25^a	382.42±1.37^b	358.23±1.32^d
草本层 Herb layer	草茎Stem	320.48±4.55^c	372.54±8.79^a	367.19±8.17^ab	355.15±6.75^b	333.51±8.91^c
	草叶Leaf	312.42±10.41^b	359.86±6.24^a	348.31±10.6^a	336.69±9.89^b	306.67±19.68^b
	草根Root	324.15±2.00^b	365.64±3.98^a	352.40±7.74^a	328.86±4.31^b	332.24±4.94^b
凋落物层 Litter layer		314.18±6.68^d	333.35±10.78^c	398.67±2.66^a	379.48±5.83^b	385.07±5.63^b

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