Changes in metal fractionation in the rhizosphere of the Ni hyperaccumulator Alyssum serpyllifolium subsp. lusitanicum

摘要：

This study determined root-induced changes in soil physicochemical properties and metal (Co, Cr, Ni) availability in three populations of the Ni hyperaccumulator, Alyssum serpyllifolium, and the non hyperaccumulator Dactylis glomerata, growing in two geographical regions of the NW Iberian Peninsula. Soil pH and CEC were significantly increased at the rhizosphere, and this was most pronounced in Portuguese populations of the hyperaccumulator. Significant changes in metal distribution were found at the rhizosphere of the hyperaccumulator but not in that of Dactylis: residual Ni decreased while reducible (Ni) and oxidisable (Co/Ni) fractions increased. Results reinforce the possible replenishment of Ni by hyperaccumulators through their root activities.

关键词： Alyssum serpyllifolium hyperaccumulator rhizosphere sequential extractions

作者: M. Garcia Leston P. S. Kidd C. Becerra Castro C. Monterroso

作者单位: Instituto de Investigaciones Agrobiologicas de Galicia (IIAG), Consejo Superior de Investigaciones C Departamento de Edafologia y Quimica Agricola, Universidad de Santiago de Compostela, 15786 Santiago

会议类型: 国际会议

会议名称: 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)

会议地点: 北京

会议语种:英文

页码: 192-193

在线出版日期: 2007-07-15（万方平台首次上网日期，不代表论文的发表时间）