沙棘修复铁尾矿的年限效应OA

Iron tailings are a typical solid waste generated during the mining and processing of iron ore,characterized by both nutrient deficiency and high heavy metal content.Given their pollution characteristics,phytoremediation technology has become a key approach in the treatment of iron tailings pollution due to its advantages such as low cost,minimal environmental disturbance,and long-lasting remediation effects.To clarify the impact of sea buckthorn reclamation duration on the micro-environment of iron tailings,a study was conducted at an iron tailings pond in Qian'an City of Hebei Province using field sampling methods to investigate the remediation effects of sea buckthorn under different reclamation durations(6,10,and 14 years).The measured indicators included the plant height,crown width,ground diameter,breast height diameter,number of branches,leaf area,chlorophyll content,and peroxidase activity of sea buckthorn,as well as the moisture content,pH,alkaline hydrolyzable nitrogen,available phosphorus,and available potassium content of the iron tailings.The aim was to explore the mutual influences and correlations between the physiological characteristics of sea buckthorn and the physicochemical properties of the iron tailings.The results showed that after 14 years of reclamation,the plant height,crown width,ground diameter,breast height diameter,and number of branches of sea buckthorn significantly increased by 20.90％,72.21％,136.29％,141.46％,and 65.99％,respectively,compared to those after 6 years of reclamation.Meanwhile,the available potassium content in the iron tailings significantly increased by 79.97％.Correlation analysis revealed that the plant height,crown width,ground diameter,and breast height diameter of sea buckthorn were significantly positively correlated with the moisture content,alkaline hydrolyzable nitrogen,and available potassium content of the iron tailings,indicating that the growth and development of sea buckthorn can effectively and significantly improve the physicochemical properties of iron tailings.Redundancy analysis(RDA)further confirmed that the growth characteristics of sea buckthorn are important contributing factors to the improvement of the micro-environment of iron tailings.In conclusion,sea buckthorn can effectively enhance the nutrient content of iron tailings,and the remediation effect strengthens with prolonged reclamation duration.The findings of this study provide a scientific basis for soil reclamation and environmental restoration in mining areas,offering valuable insights for promoting the application of phytoremediation technology in the treatment of iron tailings.