文章摘要
时雯雯,周金龙,尹立河,张鹏伟.新疆和田高氟区土壤氟形态分布与风险评价[J].农业环境科学学报,2024,43(5):1077-1091.
新疆和田高氟区土壤氟形态分布与风险评价
Distribution and risk assessment of soil fluorine morphology in the high fluoride zone of Hotan, Xinjiang
投稿时间:2023-06-07  
DOI:10.11654/jaes.2023-0441
中文关键词: 和田地区    土壤  赋存形态  风险评价
英文关键词: Hotan region  fluoride  soil  speciation  risk assessment
基金项目:中国地质调查局项目(DD20220962)
作者单位E-mail
时雯雯 中国地质调查局乌鲁木齐自然资源综合调查中心, 乌鲁木齐 830057  
周金龙 新疆农业大学水利与土木工程学院, 乌鲁木齐 830052 zjzhoujl@163.com 
尹立河 中国地质调查局乌鲁木齐自然资源综合调查中心, 乌鲁木齐 830057  
张鹏伟 中国地质调查局乌鲁木齐自然资源综合调查中心, 乌鲁木齐 830057  
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中文摘要:
      为探明新疆和田高氟区小麦农田土壤氟的赋存形态特征及环境风险,采集该区小麦农田耕作层和剖面土壤样品,分析其总氟(TF)含量和氟形态分布,探讨其影响因素,并对比研究TF和氟形态的污染水平和潜在生态风险。结果表明:研究区耕作层土壤TF含量范围为552~761 mg·kg-1,平均值为629 mg·kg-1。各形态氟的分布规律为残余态氟(Res-F)≫有机束缚态氟(Or-F)>水溶态氟(Ws-F)>铁锰结合态氟(Fe/Mn-F)>可交换态氟(Ex-F),其中Ws-F含量均值为4.35 mg·kg-1,具有较强的生物有效性。剖面土壤中,TF、Res-F和Or-F的含量最大值均出现在表层,Ws-F含量随土层深度的增加呈增加趋势,Ex-F和Fe/Mn-F含量的垂向变化不显著。土壤TF与Res-F呈极显著正相关关系,Ex-F与Ws-F和Or-F呈显著正相关关系,Fe/Mn-F与其他形态氟间不存在显著相关关系。Ws-F与Ex-F在一定条件下可以相互转化,处于动态平衡状态。综合分析结果表明,三氧化二铝(Al2O3)是影响TF和Res-F含量的主要因素,硼(B)是影响Ex-F含量的主要因素,有机碳(SOC)是影响Fe/Mn-F含量的主要因素,Ws-F和Or-F与土壤理化性质间无显著相关性。地累积指数和潜在生态风险指数评价结果表明,研究区污染程度总体较低,基于氟赋存形态的生态风险较低,而基于土壤TF含量评价的结果偏高。从生物可利用的角度来说,基于氟赋存形态的生态风险评价结果相较于传统的基于总量的评价结果更加准确。
英文摘要:
      To investigate the occurrence and environmental risk of soil fluoride in wheat fields in the high-fluoride area of Hotan, Xinjiang, soil samples were collected from the plow layer and soil profiles. The total fluoride(TF) and fluoride speciation were analyzed to explore influencing factors, compare pollution levels, and assess potential ecological risks associated with TF and fluoride speciation. The results indicated that the TF content in the plow layer soil of the study area ranged from 552 mg·kg-1 to 761 mg·kg-1, with an average of 629 mg·kg-1. The distribution pattern of the various fluoride forms was as follows:residual fluoride(Res-F)≫organic-bound fluoride(Or-F)>water-soluble fluoride(Ws-F)>iron-manganese-bound fluoride(Fe/Mn-F)>exchangeable fluoride(Ex-F). An average Ws-F content of 4.35 mg·kg-1 was observed, indicating significant bioavailability. In soil profiles, the maximum values of TF, Res-F, and Or-F occurred in the surface layer, whereas Ws-F content increased with soil depth. Vertical variations of Ex-F and Fe/Mn-F were not significant. Soil TF showed a highly significant positive correlation with Res-F, and Ex-F had a significant positive correlation with Ws-F and Or-F; there was no significant correlation between Fe/Mn-F and other fluoride forms. Ws-F and Ex-F mutually converted under certain conditions, maintaining a dynamic equilibrium. Overall, the results suggested that aluminum oxide(Al2O3) was the main factor influencing TF and Res-F contents, and boron(B) was the primary factor affecting Ex-F content. Soil organic carbon(SOC) played a key role in influencing Fe/Mn-F contents. Ws-F and Or-F showed no significant correlation with soil physicochemical properties. The soil accumulation index and potential ecological risk index evaluation indicated a generally low pollution level in the study area. The ecological risk assessment based on fluoride speciation was lower than that of a traditional total fluoride-based assessment, providing a more accurate perspective from a biologically available standpoint.
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