Metal Deficiencies and Imbalances in Wetland Plants from a Manganese- Enriched Wetland in Southern Guam: a Preliminary Investigation
Trace metal levels were determined in surface waters, soil, soil pore-waters and plants from a perennial wetland in southern Guam. This wetland is unusual in that it has formed in an area geologically enriched with pyrolusite, a manganese bearing ore found primarily in fractures and fissures of the soft volcanic rocks that dominate the upland terrain. Iron and manganese levels in surface waters draining the wetland were at least an order of magnitude higher than those in other Guam rivers and streams draining watersheds without wetlands, while levels in sediment pore-waters were up to three orders of magnitude higher. The metal status of the common sedge, Fimbristylis tristachya, suggested the species was deficient in iron, copper and zinc. In contrast, manganese concentrations in this species and in the climbing fern, Lygodium microphyllum, sometimes approached levels considered phytotoxic to most other plants. Extremely high levels of manganese were encountered in the leaves of the monocot tree, Pandanus tectorius, with values exceeding 10,000 μg/g dry weight in certain wetland representatives. Historically, dried Pandanus leaves were used extensively as a source of domestic fiber in the local Chamorro culture. A possible link between the use of this plant and a neurodegenerative disease complex that once plagued the island and is symptomatically similar to the occupational disease, ‘manganism’, is considered.
Guam wetland trace elements soil soil pore-waters wetland plants manganism
Gary R.W.DENTON H.Galt SIEGRIST Jeanette P.JANO-EDWARDS
Water and Environmental Research Institute of the Western Pacific,University of Guam,UOG Station,Mangilao,Guam 96923,USA
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
1853-1858
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）