电解锰渣上苔藓结皮对2种草生长的影响

Effects of Moss Crusts on the Growth of Two Grasses on Electrolytic Manganese Residue

以紫花苜蓿(Medicago sativa)和黑麦草(Lolium multiflorum)为材料,在盆栽条件下探讨了不同种类苔藓结皮对电解锰渣上能源草种子萌发及幼苗生长的影响。结果表明:南亚丝瓜藓(Pohlia gedeana)结皮和红蒴真藓(Bryum atrovirens)结皮都能促进电解锰渣上2种草种子的萌发,南亚丝瓜藓结皮对黑麦草种子的发芽率影响程度较大,发芽率提高了17.78个百分点,红蒴真藓结皮对紫花苜蓿种子的发芽率影响程度较大,发芽率提高了34.44个百分点。同时,与对照相比,苔藓结皮促进了能源草幼苗的生长,增加了光合色素的含量,降低了过氧化物酶(Peroxidase,POD)活性,为能源植物的生长提供了适宜的环境。综合各项发芽指标、生长指标和生理指标,南亚丝瓜藓结皮对能源草的生长促进作用最强,是锰矿废渣区生态修复理想的生物结皮,黑麦草的抗逆性强于紫花苜蓿,采用南亚丝瓜藓结皮联合黑麦草对锰矿废渣区进行生态修复比较理想。

Two kinds of energy grasses,Medicago sativa and Lolium multiflorum were used as materials to study the effects of different kind of moss crusts on seed germination and seedling growth of energy grasses on the electrolytic manganese residue under pot conditions.The results showed that both crusts,Pohlia gedeana and Bryum atrovirens could promote the germination of 2 recommended seeds on electrolytic manganese residue.The germination rate,germination vigor and germination index of two energy grasses were significantly increased by moss crusts(P<0.05).The P.gedeana crust had a greater effect on germination ratio of L.multiflorum seeds,and the germination ratio had been increased by 17.78%.The B.atrovirens crust had a greater effect on germination ratio of M.sativa seeds,and the germination ratio had been increased by 34.44%.Compared with the control,moss crusts promoted the growth in energy grass seedlings and the content of photosynthetic pigment,but decreased in the POD activity,which provided a suitable environment for the growth of energy grasses.According to the germination,growth and physiological parameters,P.gedeana was the most suitable biocrust for ecological restoration of electrolytic manganese residue.At the same time,the resistance of L.multiflorum was stronger than that of M.sativa.Overall,it is ideal to use P.gedeana combined with L.multiflorum for ecological restoration of electrolytic manganese residue.