Work

Enhancing arsenic and cadmium phytoextraction and soil microbial response with fertilizers or oxalic acid in Pteris vittata L. and Sedum alfredii Hance intercropping system

Year: 2024

Type: article

Abstract: Pteris vittata L. and Sedum alfredii Hance intercropping system has been proved to remediate arsenic (As) and cadmium (Cd) co-contaminated soil. In this study, a greenhouse experiment was conducted to investigate the efficiency of using fertilizers [organic fertilizer (OF), calcium magnesium phosphate (CMPF), and compound fertilizer (CF)] and oxalic acid (OA) to enhance phytoextraction of As and Cd in this intercropping system. The results indicated that these amendments could promote plant growth and enhance As/Cd contents in hyperaccumulators . The total accumulation of As and Cd from OA treatment per pot was enhanced by 91.2 % and 74.3 %, followed by CMPF and CF treatments. The available contents of As and Cd from OA treatment were the lowest with decrease by 16.0 % and 20.6 % in comparison to control treatment, respectively, and enzyme activities were improved. Proteobacteria was the domain phylum accounting for 25.7 %-31.8 %, followed by Chloroflexi (19.7–23.2 %), Actinobacteria (18.8 %-21.9 %), Acidobacteria (8.10 %-10.9 %), and Gemmatimonadetes (5.21 %-6.85 %). The relative abundance of Sphingomonas was positively correlated with As accumulation, and there was a positive relationship between Roseiflexaceae , Gemmatimonadaceae and Cd accumulation. OA and CMPF were suitable amendments for enhancing As and Cd accumulation and alleviating toxicity in the intercropping system of P. vittata with S. alfredii .

Source: Journal of environmental chemical engineering

DOI: 10.1016/j.jece.2024.115250