Study on the Adaptability and Soil Improvement Effect of Different Forage Plants in Rare Earth Tailings
The study aims to explore the adaptability of different forage plants to rare earth tailings as well as the effects of forage plants on soil improvement.This paper focuses on the growth and devel-opment status of six plants,including king grass,elephant grass,corn grass,forage mulberry,broussonetia papyrifera and magnolia multiflora,and soil physical and chemical improvement effects in rare earth tailings by a in-situ field randomized block experiment.The results showed that the survival rate,average plant height and total biomass of king grass were 91.94%,120.21 cm and 32.54 g,respectively,which were significantly higher than those of other plants,followed by ele-phant grass,maize grass,forage mulberry and broussonetia papyrifera,but the survival rate of mag-nolia multiflora was zero on the day 21.King grass,elephant grass and forage mulberry significantly reduced soil bulk density and increased the proportion of soil silt.Corn grass only had a significant effect on reducing soil bulk density.King grass increased soil total nitrogen and total phosphorus by 400.00%and 92.31%,respectively,forage mulberry increased soil available phosphorus and a-vailable potassium by 321.33%and 270.68%,respectively,and corn grass increased soil organic matter by 414.10%.The effect of Broussonetia papyrifera and Magnolia multiflora in rare earth tail-ings were poor.Overall,king grass,elephant grass,corn grass and forage mulberry can be used as pioneer plants for the phytoremediation of soils in rare earth tailings.
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