吉林西部盐碱地土壤氟分布特征及其对土地利用的响应

Distribution characteristics of fluoride and its response to land use in saline-alkali soils from western Jilin Province

  • 摘要: 采集水田、旱田和盐碱荒地的土壤样品,利用形态测定的方法,分析吉林省西部盐碱地不同灌区表层土壤全氟、水溶态氟含量的分布规律,并开展水溶态氟的分级分区,分析土壤类型及土地利用类型对土壤氟含量的影响,探讨区域盐碱土壤水溶态氟含量高的成因。结果发现,区域盐碱土壤全氟和水溶态氟含量均值分别为365.26 mg·kg−1和14.45 mg·kg−1,灌区间盐碱土壤全氟含量存在明显差异,水溶态氟含量差异不明显;区域全氟含量处于中低水平,而水溶态氟含量处于较高水平,土地利用类型对土壤全氟、水溶态氟含量有一定影响;地质地貌背景和盐碱环境共同造成区域盐碱土壤水溶态氟在土壤中的形成与富集。盐碱荒地水田开发中氟的环境风险不容忽视,建议加强固定剂的施用和污染防控措施的研发。

     

    Abstract: Surface layer soil samples from paddy rice field, dryland and abandoned land were collected in the main saline-alkali irrigated area of western Jilin Province. Distribution characteristics of total fluoride (TF) and dissolved fluoride (DF) were identified. The subarea was divided based on the classification of DF. The reason of higher soil DF concentration was discussed. The findings show that the arithmetic mean concentrations of TF and DF in soil in the region are 365.26 mg·kg−1, 14.45 mg·kg−1, respectively. The concentrations of TF are at a mid-low level and significant difference (P<0.05) among irrigated areas, while DF concentrations are at a higher level and no significant regional difference. Land use affects soil TF and DF concentrations to some extent. Both geological-geomorphological setting and saline environment impact the formation and enrichment of DF in soil. Environmental risks of DF from saline land reclamation cannot be ignored. Application of fixing agent of DF is necessary to control the eco-environmental effect of DF.

     

/

返回文章
返回