Invasive and non-invasive Plants Differ in Response to Soil Heavy Metal Lead Contamination

入侵植物和非入侵植物對土壤重金屬鉛污染的不同響應

楊如意(Ru-Yi Yang) ； 唐建軍(Jian-Jun Tang) ； 楊一松(Yi-Song Yang) ； 陳欣(Xin Chen)

《Botanical Studies》 48卷4期 (2007/10) Pp. 453-458

摘要

通過在溫室內進行的中宇宙試驗檢驗了入侵植物（加拿大一枝黃花）和兩種非入侵植物（高羊茅、雞眼草）對土壤重金屬鉛污染的響應是否以及如何存在差異。本研究通過在土壤中加入三個水平的醋酸鉛溶液來模擬對照土壤以及有加拿大一枝黃花生長的兩種重金屬污染的土壤。本地種雞眼草的地上部分生物量、N和P的吸收量在鉛污染土壤中顯著下降；而引入種高羊茅以及入侵種加拿大一枝黃花在鉛污染土壤中則顯著提高。與對照相比，鉛污染顯著降低了雞眼草的菌根侵染率和根瘤生物量。入侵種加拿大一枝黃花的根部鉛濃度分別為雞眼草各個鉛處理中根部鉛濃度的6.42%，5.93%和11.21%。結果表明，鉛污染土壤中加拿大一枝黃花的快速生長是由於與非入侵種相比它具有減少或排斥鉛吸收的能力。

關鍵字

入侵植物 ； 重金屬鉛 ； 菌根 ； N和P吸收

並列摘要

A greenhouse experiment was conducted to test whether and how invasive species (Solidago canadensis) and two non-invasive plant species (Festuca arundinacea, Kummerowia striata) differed in response to soil heavy metal lead pollution in a mesocosm system. Metal lead was applied as Pb(AC)2•3H2O in solution at three levels (0,300 mg kg^(-1) and 600 mg kg^(-1) soil) to simulate a control site and two polluted sites where S. canadensis grows. Shoot biomass and N and P uptake of the indigenous species K. striata decreased, but those of the introduced species F. arundinacea and the exotic invasive species S. Canadensis increased in Pb polluted soils. Mycorrhizae colonization of the three species and the nodule biomass of K. striata were reduced by elevated soil Pb concentration compared to control. Root Pb concentration in invasive S. canadensis only accounted for 6.42%, 5.93% and 11.21% of those in non-invasive K. striata under corresponding Pb treatments. The results suggested that rapid growth of S. canadensis in Pb polluted soil might be due to its ability to exclude Pb or reduce the uptake of Pb compared to non-invasive species.

並列關鍵字

Invasive plant species ； Metal lead ； Mycorrhizae ； N and P uptake