电解锰渣与磷石膏复配对芒草种子萌发及幼苗生长的影响

Effects of electrolytic manganese residue and phosphogypsum composite substrates on seed germination and seedling growth of Miscanthus

采用培养皿实验,以能源植物芒草(Miscanthus spp.)为材料,将磷石膏(Phosphogypsum)分别以总质量的5%、10%、15%、20%和25%添加到电解锰渣(Electrolytic manganese residue)中组成混合基质,并以纯电解锰渣和纯磷石膏为对照,探讨电解锰渣与磷石膏复配对芒草种子萌发及幼苗生长的影响。结果表明,芒草种子的发芽率为77.78%~94.44%,除磷石膏占比为5%以外的各处理之间差异不显著;复配基质中磷石膏的质量占比为15%~25%,发芽势和发芽指数最高。与单独以电解锰渣或单独以磷石膏作为基质时相比,两者的复配明显促进了芒草幼苗的生长,使其地上部鲜重分别增加了12.50%~30.68%和22.22%~41.98%。同时,复配基质还不同程度增加了芒草叶片的叶绿素a和总叶绿素含量,降低了丙二醛含量。模糊隶属函数分析结果显示,当复配基质中电解锰渣和磷石膏的质量比分别为85%和15%时,平均得分最高,较适宜芒草的生长。本研究可为能源植物的种植以及锰矿区和磷矿区的环境治理提供依据。

The energy plant Miscanthus was used as the material,a petri dish experiment were used to investigate the effect of electrolytic manganese residue and phosphogypsum compound on seed germination and seedling growth of Miscanthus.Phosphogypsum was added to electrolytic manganese residue at a total mass of 5%,10%,15%,20%,and 25%to form a mixed matrix.Pure electrolytic manganese residue and pure phosphogypsum were used as controls.The results showed that the germination rates of Miscanthus seeds in this study ranged from 77.78%to 94.44%,and the differences were not significant among the treatments except for 5%phosphogypsum treatment.The mass proportion of phosphogypsum in the composite matrix was from 15%to 25%,with the highest germination potential and germination index.Compared with electrolytic manganese residue alone and phosphogypsum alone as substrate,the compounding of the two significantly promoted the growth of Miscanthus seedlings,which increased their shoot fresh weights by 12.50%to 30.68%and 22.22%to 41.98%,respectively.At the same time,the compounded substrates also increased the chlorophyll a and total chlorophyll contents and decreased the malondialdehyde(MDA)content.The fuzzy membership function analysis results showed that the average score was highest when the mass ratios of electrolytic manganese residue and phosphogypsum in the composite matrix were 85%and 15%,respectively,which was more suitable for the growth of Miscanthus.This study could provide a basis for the cultivation of energy plants and the environmental protection of manganese and phosphorus mining areas.