接种丛枝菌根真菌对雌雄美洲黑杨吸收铅镉的影响

发布时间：2018-02-27 00:36

本文关键词： 复合污染植物修复美洲黑杨雌雄异株植物　出处：《环境科学学报》2017年01期 　论文类型：期刊论文

【摘要】：以雌雄美洲黑杨(Populus deltoides)为研究对象,砂培条件下,研究接种丛枝菌根真菌(Glomus intraradices)对受Pb污染(200 mg·kg-1)、Cd污染(10 mg·kg-1)及复合污染的雌雄美洲黑杨Pb和Cd的富集与分配特征的影响,关注Pb/Cd复合污染独特的环境效应.结果表明:1未接种丛枝菌根真菌条件下,与单一污染相比,复合污染增加了美洲黑杨雄株叶、粗根、细根Pb和Cd含量;复合污染增加了雌株叶片中Pb和Cd含量,却降低了粗根和细根中Pb和Cd含量;复合污染条件下雄株Pb和Cd向地上部分器官的迁移率分别增加135%和78%,雌株则分别增加52%和18%.2复合污染条件下,接种丛枝菌根真菌引起雄株Pb和Cd富集系数分别增加87%和6%,雌株则分别增加171%和65%;雄株Pb和Cd向地上部分器官的迁移率降低65%和69%,雌株则分别降低59%和53%.3Pb污染条件下,接种丛枝菌根真菌的雌雄之间Pb积累量没有显著差异;Cd污染条件下,接种丛枝菌根真菌的雄株总Cd积累量是雌株的1.7倍;复合污染条件下,接种丛枝菌根真菌的雌株Pb和Cd总积累量分别是雄株的1.3和1.2倍.本研究表明,接种G.intraradices能提高美洲黑杨的Pb和Cd积累能力,对于不同污染条件下,应根据实际情况选择合适的杨树性别进行造林和生态修复.
[Abstract]:Using Populus deltoides as the research object, the effects of inoculation of Glomus intraradiceson Pb contaminated with 200 mg 路kg -1 CD (10 mg 路kg -1) and compound pollution on Pb and CD enrichment and distribution of male and female Populus deltoides were studied under the condition of sand culture, and the effects of Glomus intraradiceson inoculation on the accumulation and distribution of Pb and CD in poplar, male and female, were studied. The results showed that the contents of Pb and CD in male leaves, thick roots, fine roots of Populus Americana were increased under the condition of no inoculation with arbuscular mycorrhizal fungi. Compound pollution increased Pb and CD contents in leaves of female plants, but decreased Pb and CD contents in coarse roots and fine roots. The migration rates of Pb and CD to the aboveground organs increased by 135% and 78 in male plants, and 52% and 18.2 in female plants, respectively. Inoculation of arbuscular mycorrhizal fungi increased Pb and CD enrichment coefficients of male plants by 87% and 6, and female plants by 171% and 65.The migration of Pb and CD to the aboveground organs of male plants decreased by 65% and 69, and that of female plants decreased by 59% and 53.3Pb, respectively. There was no significant difference in Pb accumulation between male and female inoculated arbuscular mycorrhizal fungi. Under the condition of CD pollution, the total CD accumulation of male plants inoculated with arbuscular mycorrhizal fungi was 1.7 times higher than that of female plants. The total accumulation of Pb and CD in female plants inoculated with arbuscular mycorrhizal fungi was 1.3 and 1.2 times higher than that in male plants, respectively. The results showed that G. intraradices inoculated with G. intraradices could improve the accumulation capacity of Pb and CD in Populus Americana. The proper sex of poplar should be selected according to the actual situation for afforestation and ecological restoration.
【作者单位】：四川农业大学生态林业研究所长江上游生态安全协同创新中心林业生态工程四川省重点实验室;
【基金】：国家自然科学基金(No.31300513) 中国博士后科学基金(No.2012M521707)~~
【分类号】：X17;X53

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