不同电导率盐碱土壤固碳潜力

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Abstract The saline-alkali soil (EC=0.27mS/cm) in hetao irrigation area of Inner Mongolia was collected, and the soil conductivity was adjusted by NaCl to (0,10,20,40,80mS/cm). Based on stable carbon isotope, the soil CO₂ uptake and insoluble inorganic carbon content (SI) of soils with different conductivity were analyzed after adding quantitative δ¹³C-CO₂) - the delta ¹³C values. The results showed that salinic-alkali soil could absorb CO₂, and the cumulative CO₂ uptake increased with the increase of soil conductivity (EC). The cumulative CO₂ uptake of S5(EC=80mS/cm) was 1.6640mg higher than that of S1(0.27ms /cm). Soil SIC content (R²=0.7080,P<0.05) and soil soluble inorganic carbon content (DIC)(R²=0.6096,P<0.05) were significantly negatively correlated with soil EC. The value of SIC-d¹³C (-5.299‰~-0.8341‰) in saline-alkali soil increased significantly with the addition of d¹³C-CO₂. In EC, the highest d¹³C-CO₂ concentration was 1.276mg in 20mS/cm soil, and the highest δ¹³C-CO₂ concentration was 30.28% in soil ¹³CO₂ absorption. When EC was 80mS/cm, the lowest carbon sequestration was 0.2749mg, and the total d¹³C-CO₂ sequestration accounted for 5.579% of the total ¹³CO₂ sequestration.

Key words： Saline soils carbon sequestration potential carbon sequestration carbon sinks carbon isotopes soil

Received: 11 January 2022

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X171

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	LIU Yu-bin
	JIAO Yan
	YANG Wen-zhu
	ZHANG Jing
	WANG Yan
	LING Ling

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LIU Yu-bin,JIAO Yan,YANG Wen-zhu等. Potential for fixing inorganic carbon in soils with different salinity levels[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4362-4368.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I9/4362

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