摘要
【目的】探讨农田中重金属锌(Zn)和镉(Cd)污染对杂草种子萌发指标的影响。【方法】以4种农田杂草种子为试材,比较不同质量浓度锌Zn2+、Cd2+单一胁迫对麦家公(Buglossoides arvense)、麦瓶草(Silence conoidea)、刺儿菜(Cirisum setosum)和播娘蒿(Descurainia sophia)种子一系列萌发指标间的影响。采用隶属函数法综合评价4种农田杂草对重金属Zn、Cd的耐性。【结果】随着Zn2+和Cd2+质量浓度的升高,除麦瓶草的发芽率、发芽势和发芽指数在Zn2+质量浓度为50~400 mg/L和Cd2+质量浓度为25~200 mg/L之间时出现一定的波动,表现出低抑制、高刺激的现象外,4种农田杂草种子的各项萌发指标均有不同程度的降低。隶属函数评价表明:4种农田杂草的耐Zn胁迫能力为麦瓶草>刺儿菜>播娘蒿>麦家公;4种农田杂草的耐Cd胁迫能力为刺儿菜>麦瓶草>播娘蒿>麦家公。【结论】麦瓶草对重金属Zn的耐受能力最强,刺儿菜对重金属Cd的耐受能力最强,而麦家公对Zn、Cd的耐受能力均最弱。
[Purpose]In order to investigate the effects of heavy metal zinc and cadmium pollution on weed seed germination indicators in farmland soil.[Method]Using 4 species of seeds as test materials,the difference between a series of germination indicators of weeds(Buglossoides arvense,Silence conoidea,Cirisum setosum and Descurainia sophia)were compared under the single stress of zinc(Zn2+)and cadmium(Cd2+).The subordinate function method was used to comprehensively evaluate the tolerance of 4 species of farmland weeds under Zn and Cd stress.[Result]With the increase of Zn2+and Cd2+mass concentration,the germination indicators of the 4 species of weed seeds decreased to different degrees,except for S.conoidea,which showed a certain fluctuations in its germination rate,germination potential and germination index when the Zn2+mass concentration of 50-400 mg/L and Cd2+mass concentration of 25-200 mg/L.According to the comprehensive membership function analysis,the tolerance of 4 species of weeds under the Zn stress was S.conoidea>C.cd setosum>D.sophia>B.arvense,the tolerance of 4 species of weeds under the stress was C.setosum>S.conoidea>D.sophia>B.arvense.[Conclusion]The S.conoidea had the strongest tolerance to heavy metal zinc,C.setosum had the strongest tolerance to heavy metal cadmium.However,B.arvense had the weakest tolerance to both zinc and cadmium.
作者
吴羽晨
邓小莉
张家洋
毛雪飞
WU Yuchen;DENG Xiaoli;ZHANG Jiayang;MAO Xuefei(School of Science and Technology,Xinxiang University,Xinxiang 453000,China)
出处
《云南农业大学学报（自然科学版）》
CSCD
北大核心
2020年第6期1089-1095,共7页
Journal of Yunnan Agricultural University:Natural Science
基金
河南省农业领域科技攻关项目(162102110028)。
关键词
锌
镉
麦家公
麦瓶草
刺儿菜
播娘蒿
萌发期
zinc
cadmium
Silence conoidea
Cirisum setosum
Descurainia sophia
Buglossoides arvense
germination
