Characteristics and impact factors of enzyme activity in red mud storage field repaired by different salt-tolerant plants
Through field experiments,three salt-tolerant plants(Tamarix,Suaeda salsa,and Lolium perenne)were cultivated in red mud storage field to investigate the activity characteristics of catalase,phosphatase,urease,and invertase in the red mud matrix.By analyzing the changes in the physical and chemical properties of the red mud matrix,the impact of salt-tolerant plants on the enzyme activity of the red mud matrix was assessed.The results showed that after planting Tamarix,Suaeda salsa,and Lolium perenne,the pH,total salt content,and electrical conductivity of the red mud matrix decreased,while the total nitrogen,available phosphorus,and rapidly available potassium content increased.The activities of phosphatase,urease,catalase,and invertase in the matrix also improved to varying degrees,indicating that the salt absorption capacity of salt-tolerant plants and the secretory function of their root systems could effectively improve the physical and chemical properties of the matrix,alleviate the degree of salinization,and thus enhance the enzyme activity.Among them,Suaeda salsa showed better adaptability to Bayer process red mud than Tamarix and Lolium perenne,while Tamarix had superior adaptability to sintering process red mud than Suaeda salsa and Lolium perenne.Both the type of plant and the type of red mud affected the matrix enzyme activity,with the plant type having a greater influence on enzyme activity than the type of red mud.Enzyme activity was closely related to the basic physical and chemical indicators,with pH and electrical conductivity being the key factors influencing enzyme activity.
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