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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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山西工矿区土壤so2-pahs复合污染对玉米种子萌发和幼苗生长的影响
DOI: 10.3724/SP.J.1145.2013.00134, PP. 134-140
Keywords: 二氧化硫（so2）,多环芳烃（pahs）,复合污染,土壤,玉米,生态毒性,山西工矿区
Abstract:
二氧化硫（sulfurdioxide，so2）和多环芳烃（polycyclicaromatichydrocarbons，pahs）是山西工矿区同时发现的两种典型环境污染物，对区域土壤环境的影响极大.本文以山西工矿区生黄土为供试土壤，以玉米种子为供试作物，采用室内培养皿育苗试验，研究了不同浓度的so2（0、10、100、500、1000mgkg-1）与pahs（0、1、10、50、100mgkg-1）单一及复合污染对玉米种子的萌发率、苗期株高、根长和总生物量的影响，以表征so2与pahs复合污染的生态毒性.结果表明，与对照相比，so2单一污染对玉米种子萌发起到促进作用，对玉米苗期株高、根伸长及早期总生物量则是低浓度（10-100mgkg-1）促进生长，高浓度（500-1000mgkg-1）抑制生长；pahs单一污染对玉米种子的萌发没有明显的影响，对玉米苗期株高、根伸长及总生物量也是低浓度（1-10mgkg-1）促进生长，高浓度（50-100mgkg-1）抑制生长；so2-pahs复合污染条件下，只有高浓度的复合污染处理对玉米种子萌发起抑制作用，但与对照相比没有显著性差异；低浓度的so2与低浓度的pahs处理对玉米株高、根伸长及总生物量有一定的刺激作用，而高浓度的so2与高浓度的pahs处理则抑制了玉米的生长，即随着so2和pahs浓度的升高，复合污染的毒性逐渐增强.多元回归分析进一步表明，玉米株高和根伸长主要受so2和pahs的共同影响，而玉米苗期总生物量主要受pahs的影响.
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