摘要
通过测定泉州湾河口湿地2种红树植物(桐花树和秋茄)不同部位(根、枝和叶)及其根际沉积物中重金属酸可提取态含量,探讨该区域重金属元素的分布、在植物不同部位富集和迁移的情况。结果表明:2种红树植物根际沉积物中酸可提取态重金属含量顺序均为Fe>Mn>Zn>Pb>Cu>Cr>Ni;秋茄根际沉积物中Cu、Zn、Pb、Ni和Cr两两之间呈正相关,桐花树根际沉积物中Cu与Zn呈正相关,Pb与其他重金属的相关性不显著;2种红树植物根中大多数重金属含量与根际沉积物中重金属酸可提取态含量之间呈正相关,而枝中的相关性不显著;2种红树植物重金属富集的情况较接近,Mn富集系数最大,其次是Cu和Zn;Mn、Cu、Zn、Cr主要富集在叶中,而Pb、Fe、Ni主要富集在根部;2种植物中Mn的迁移能力最强,易于从根部运输到叶中。
The distribution, enrichment and migration characteristics of heavy metals in the mangroves of Aegiceras corniculatum and Kandelia candel collected from the mangrove wetland in Quanzhou Bay estuary were studied by means of determining the contents of acid extractable heavy metals in rhizosphere sediments and different parts of mangrove. The acid extractable contents of heavy metals in the rhizosphere sediments of both mangrove plants showed a sequence of Fe 〉 Mn 〉 Zn 〉 Pb 〉 Cu 〉 Cr 〉 Ni. In K. candel rhizosphere sediments, Cu, Zn, Pb, Ni and Cr presented positive correlation to each other. In A. corniculatum sediments, Cu and Zn showed a positive correlation, while Pb had no significant correlation to other metals. Most heavy metals in the roots of both mangrove plants showed positive correlations to their acid extractable contents in the rhizosphere sediments, while the heavy metals in the branches had no significant correla- tions to their acid extractable contents in the sediments. The enrichment capabilities of the two mangrove plants showed the same trend that Mn was the highest, followed by Cu and Zn. For both plants, Mn, Cu, Zn and Cr were mainly concentrated in leaves, while Pb, Fe and Ni mainly concentrated in roots. Mn showed the highest transfer ability from root to leaf in both plants.
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第4期1136-1142,共7页
Chinese Journal of Ecology
基金
国家自然科学基金项目(21077036)
泉州市科技计划重点项目(2011Z7)资助
关键词
桐花树
秋茄
根际沉积物
重金属
Aegiceras corniculatum
Kandelia candel
rhizosphere sediment
heavy metals.
