The effects of plants on the mobilization of Cu and Zn in soil columns
Whereas metal effects on plants have been well studied, much less is known about plant effects on metal mobilization in soils. We investigated metal mobilization and speciation with a resolution of a few cm in soil columns planted with willows (Salix viminalis). In the presence of plants the concentration profiles of DOC, major ions (e. g. Ca), Cu and Zn exhibited more variation than in the absence of plants and both smaller and larger concentrations were observed, indicative of strong local effects. The Cu concentration in the absence and presence of plants was controlled by DOC mobilization and could be described by the same relationship. Zn mobilization was controlled by DOC and Ca in the plant-free system and by pH and Ca in the presence of plants Free Cu<2+> and labile Zn were reasonably well predicted by the NICA-Donnan model and were influenced by the plant induced changes in the soil solution composition Plant uptake reduced the dissolved Zn concentration and transpiration reduced Cu and Zn leaching.
plant effect mobilization copper zinc soil column metal pollutant
Lu Zhao Rainer Schulin Bernd Nowack
Institute of Terrestrial Ecosystems (ITES), ETH ZurichUniversitatstrasse 16, Zurich, CH-8092, SWITZERLAND
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
722-723
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）