关键词: 土壤真菌, 雷竹林, 群落特征, 土层, 施肥模式

Abstract: The magnesium (Mg)-rich dust from magnesite mining and calcination has damaged the soil and vegetation severely. However, the knowledge on remediation of Mg-rich dust contaminated soil is scarce. We conducted a pot experiment in the greenhouse to evaluate the remediation effects of Aneurolepidium chinense, Elymus dahuricus, Agrostis stolonifera and Puccinellia distans, combined with application of Ca(H₂PO₄)₂·H₂O, on soil contaminated by different amounts of Mg-rich dust (0, 2%, 5% and 10%). We found that: (1) A. chinense and E. dahuricus had a very strong tolerance to Mg-rich dust contamination and the tolerance of A. stolonifera and P. distans was moderate; (2) These plants did not hold a strong Mg enrichment capacity, as the concentration of total Mg in shoot  was 1.6-8.6 g·kg^-1, the bioconcentration factor was less than 1 and the translocation factor was 0.5-3.1. These four plants had a good effect on the removal of Mg in the lightly contaminated soil (2%); (3) Application of Ca(H₂PO₄)₂·H₂O significantly enhanced the plant biomass and the removal of soil Mg, particularly in the 5% and 10% treatments. Our results suggested that planting A. chinense and P. distans with the application of Ca(H₂PO₄)₂·H₂O could not only restore vegetation, but also remove soil Mg effectively in lightly Mg-contaminated soil. In moderately and severely Mg-rich dust contaminated soil, planting A. chinense and E. dahuricus with the application of Ca(H₂PO₄)₂·H₂O could accelerate the vegetation restoration.

Key words: community characteristic, fertilization mode, soil layer, soil fungi, Phyllostachys violascens stand