重金属镍对白榆(Ulmus pumila L.)种子萌发及幼苗生长的影响  

Effect of Nickel on Seed Germination and Seedling Growth of Ulmus pumila L.

作　　者：苗秀莲[1] 刘传栋 吕艳伟[1] 

机构地区：[1]聊城大学生命学学院,山东聊城252059 [2]海南大学环境与植物保护学院,海南海口570228

出　　处：《种子》2015年第10期4-7,共4页Seed

基　　金：国家自然科学基金项目(编号:31100456)

摘　　要：以我国常见的树木白榆种子为材料,在实验室内研究了不同浓度镍对种子萌发及幼苗生长的污染效应。结果表明：1mg/L浓度的Ni 2＋能提升白榆种子的活力,但5,10mg/L浓度的Ni 2＋已经对胚根生长有了显著抑制。50,100mg/L浓度的Ni 2＋则对白榆种子中后期的发芽和生长明显产生了伤害,导致成苗率极低或无法成苗。表明低浓度的Ni 2＋促进白榆种子的萌发和生长,而高浓度的Ni 2＋则有抑制作用。发芽抑制的阈值范围在10mg/L左右,胚根伸长抑制的阈值在0~5mg/L范围内,胚轴伸长抑制的阈值在5~50mg/L范围内。白榆施肥后土壤镍浓度应不超过5mg/kg。The ecological effect of nickel on seed germination and seedling growth of Ulmus pumila L was studied in this paper.The results showed that：the treatment with 1mg/L Ni 2＋can enhance the seed vigor.The high concentration of（5,10mg/L）had significant inhibition on the growth of radicles.When Ni 2＋concentration were higher than 50 mg/L,the seeds germination and growth were all damaged,leading to low seedling survival rate even unable to germinate.This suggested that low concentration of Ni 2＋can promote seed germination and seedling growth,while exceeding certain density range can inhibit it.The range of inhibition of germination rate was near 10mg/L,radicle elongation inhibition threshold was in the 0-5mg/L range,hypocotyl elongation threshold was in the 5-50mg/L range.When soil was fertilized,nickel concentrations should not exceed 5mg/kg Ulmus pumila L.

关 键 词：镍 白榆 发芽 

分 类 号：S792.19[农业科学—林木遗传育种]