Estimation of carbon storage in Shaanxi Yellow River Wetland Provincial Nature Reserve

doi:10.17521/cjpe.2022.0071

Abstract

Abstract:

Aims Ecosystem services such as carbon sequestration and climate regulation of wetland ecosystems are very important. Accurately assessing the carbon storage of natural reserves in the Yellow River Basin is helpful for carbon neutrality research and regional ecological protection and high-quality development.

Methods Based on field sampling and laboratory analysis, combined with remote sensing data, this study assessed carbon storage in the aboveground plant biomass and the top 50 cm soils of typical natural vegetation in Shaanxi Yellow River Wetland Provincial Nature Reserve. The total target area for assessment is 13 086.52 hm², accounting for 23.87% of the nature reserve.

Important findings The results showed that the aboveground carbon storage of the tall-grass vegetation was significantly higher than that of the short-grass vegetation and shrubland, and their carbon densities were 496.73, 23.45 and 138.38 g·m^-2, respectively; the carbon density of the soil at 0-50 cm was 7.15-11.98 kg·m^-2, and the soil carbon storage in the tall-grass vegetation area (5.02 × 10⁵ t) was significantly higher than that of the beach without vegetation (2.09 × 10⁵ t), the short-grass vegetation area (3.40 × 10⁵ t) and short-shrubland area (1.45 × 10⁵ t); finally, combining the aboveground carbon storage in plant biomass and the soil carbon storage in the top 50 cm, the total carbon storage is estimated around 1.22 × 10⁶ t for the natural vegetation area of Shaanxi Yellow River Wetland Provincial Nature Reserve, of which proportions of carbon storage were 17.13%, 27.95%, 12.13% and 42.79% for beaches, short-grass vegetation area, short-shrubland, and tall-grass vegetation area. These results can provide basic data for the protection and restoration of natural wetlands and the improvement of carbon sink function in the middle reaches of the Yellow River.

Key words: wetland, carbon storage, vegetation, soil

XU Gan-Jun, WU Sheng-Yi, LI Wei, ZHAO Xin-Sheng, NIE Lei-Chao, TANG Xi-Ying, ZHAI Xia-Jie. Estimation of carbon storage in Shaanxi Yellow River Wetland Provincial Nature Reserve[J]. Chin J Plant Ecol, 2023, 47(4): 469-478.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2022.0071

https://www.plant-ecology.com/EN/Y2023/V47/I4/469

Figures/Tables 6

Fig. 1 Geographical location and distribution of sampling sites in Shaanxi Yellow River Wetland Provincial Nature Reserve.

Table 1 Basic characteristics of different land use types in Shaanxi Yellow River Wetland Provincial Reserve

土地利用类型分类 Classification of land use type	土地利用类型 Land use type	面积 Area (hm²)	占保护区面积比例 Area proportion of the reserve (%)
自然生态系统类型 Natural ecosystem type	光滩 Beach	2 916.70	5.32
	沼泽湿地 Marsh	8 383.48	15.29
	矮灌丛 Short shrubland	1 786.34	3.26
其他土地利用类型 Other land use type	农田 Farmland	8 495.16	15.49
	坑塘水面 Pond water surface	15 835.82	28.87
	河流 River	15 138.42	27.60
	农村宅基地 Rural homestead	2 289.30	4.17

Fig. 2 Distribution of vegetation types in Shaanxi Yellow River Wetland Provincial Nature Reserve and surrounding typical wetlands.

Fig. 3 Density and proportion of carbon content in different vegetation types in Shaanxi Yellow River Wetland Provincial Nature Reserve (mean ± SE). Different lowercase letters indicate significant differences among vegetation types (p < 0.05).

Table 2 Biomass of different vegetation types in Shaanxi Yellow River Wetland Provincial Reserve

湿地植被类型 Wetland vegetation type	生物量干质量 Biomass dry mass (g·m^-2)	标准误 Standard error (g·m^-2)
低草植被 Short-grass vegetation	62.80^c	6.73
矮灌丛植被 Short-shrubland vegetation	340.05^b	44.96
高草植被 Tall-grass vegetation	1 213.18^a	113.21

Fig. 4 Soil carbon density under different vegetation types in Shaanxi Yellow River Wetland Provincial Nature Reserve (mean ± SE). Different lowercase letters indicate significant differences among vegetation types (p < 0.05).

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