摘要
为探究微塑料对农作物种子发芽及幼苗生长的影响,选取农业生态系统中普遍存在的3种微塑料[乙烯-乙酸乙烯酯共聚物(EVA)、线性低密度聚乙烯(LLDPE)和聚甲基丙烯酸甲酯(PMMA)]和小麦种子为实验对象进行种子发芽实验。结果表明:在试验微塑料浓度内,三种微塑料均在低中浓度(<500 mg·L^(-1))对小麦种子发芽率有抑制作用,抑制率范围为2.86%～20%,而相较于对照组,在高浓度(1000 mg·L^(-1))时对种子发芽率具有一定的促进。微塑料对小麦种子活力指数抑制作用由强到弱依次为LLDPE>EVA>PMMA,EVA和LLDPE在低浓度时对种子平均发芽时间促进高于高浓度,且PMMA对小麦种子生长特征无显著影响。微塑料对小麦苗长、根长和干质量均没有显著影响,仅有LLDPE在10 mg·L^(-1)时明显抑制小麦芽长。
To explore the effects of microplastics on seed germination and seedling growth of wheat(Triticum aestivum L.), three widely de. tected microplastics in agroecosystems Ethylene-vinyl acetate compolymer(EVA), Linear low-density polyethylene(LLDPE)and Poly (methyl methacrylate)(PMMA)were investigated by seed germination experiments.The results showed that all microplastics inhibited wheat seed germination at low and medium concentrations(<500 mg·L^-1)with inhibition rates ranging from 2.86% to 20%. At high concen. trations(1000 mg·L^-1), the microplastics substantially promoted germination compared with that of the control group.In particular, the in. hibitory effect of microplastics on wheat seed vigor index decreased in the following order:LLDPE>EVA>PMMA. The mean germination time of wheat seeds exposed to EVA and LLDPE at low and medium concentrations was higher than that at high concentration, and PMMA had no significant effect on wheat seed growth aspects. Overall, microplastics had no significant effect on wheat seedling length, root length and dry weight, but LLDPE significantly inhibited wheat bud length at 10 mg·L^-1 concentration.
作者
连加攀
沈玫玫
刘维涛
LIAN Jia-pan;SHEN Mei-mei;LIU Wei-tao(Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education/Tianjin Key Laboratory of Urban Ecology Envi.ronmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, Chi.na)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2019年第4期737-745,共9页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(41471411)
天津市应用基础与前沿研究计划顶目(15JCYBJC22700)~~
关键词
微塑料
小麦
种子发芽
发芽特征
microplastic
wheat(Triticum aestivum L.)
seed germination
growth properties
