珊瑚海岛包气带中氮磷的迁移、转化和累积规律

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Abstract The migration and transformation of nitrogen and phosphorus in the vadose zone of coral islands have a direct impact on the groundwater quality and soil structure of the islands. Through XRD and SEM analyses, the unique CaCO₃phase composition and porous morphology of coral sand were elucidated. Static adsorption experiments were conducted to clarify the adsorption mechanism of N and P in coral sand; short-term continuous rainfall simulation column experiments were used to investigate the transport mechanism of N and P in coral sand, while long-term intermittent rainfall simulation column experiments examined the N transformation and P accumulation in different depth profiles. The results showed that the average adsorption amounts of NH₄⁺ and DIP in coral sand were 192mg/kg and 2051.75mg/kg, respectively, with adsorption models conforming to reversible linear adsorption and Freundlich isothermal adsorption models. The transport mechanism of NH₄⁺ was explicable by the linear equilibrium CDE model, while the transport process of low-concentration DIP followed a two-point chemical nonequilibrium model with an attenuation term. The transport of high-concentration DIP could not be modeled, and a dissolution and precipitation equilibrium reaction with CaCO₃ was speculated in conjunction with the pH value. Under long-term rainfall conditions, microbial analysis indicated a nitrogen pathway N₂→NH₄⁺→NO₂^-→NO₃^-→N₂/DON in the soil, posing a risk of nitrogen contamination to groundwater. Meanwhile, DIP was fixated in the form of insoluble phosphorus, potentially negatively impacting soil structure through long-term accumulation. In conclusion, the unique characteristics of N and P migration, transformation, and accumulation in the vadose zone of coral islands provide a scientific basis for environmental risk management in island ecological development.

Key words： coral sand static adsorption nitrogen and phosphorus transport hydrus-1D microorganisms

Received: 28 February 2024

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	LI Li
	ZHANG Pan
	ZHAO Zhi-wei
	ZHANG Sai
	GONG Xing
	XU Ting-hao

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LI Li,ZHANG Pan,ZHAO Zhi-wei等. Studies on the migration, transformation and accumulation pattern of nitrogen and phosphorus in the vadose zone of coral islands[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(10): 5776-5787.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I10/5776

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