title: Synchrotron micro-scale study of trace metal transport and distribution in Spartina alterniflora root system in Yangtze River intertidal zone.
abstract: This study is focused on micro-scale measurement of metal (Ca, Cl, Fe, K, Mn, Cu, Pb, and Zn) distributions in Spartina alterniflora root system. The root samples were collected in the Yangtze River intertidal zone in July 2013. Synchrotron X-ray fluorescence (XRF), computed microtomography (CMT), and X-ray absorption near-edge structure (XANES) techniques, which provide micro-meter scale analytical resolution, were applied to this study. Although it was found that the metals of interest were distributed in both epidermis and vascular tissue with the varying concentrations, the results showed that Fe plaque was mainly distributed in the root epidermis. Other metals (e.g., Cu, Mn, Pb, and Zn) were correlated with Fe in the epidermis possibly due to scavenge by Fe plaque. Relatively high metal concentrations were observed in the root hair tip. This micro-scale investigation provides insights of understanding the metal uptake and spatial distribution as well as the function of Fe plaque governing metal transport in the root system.
authors.affiliation: Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ, 07043, USA. fengh@mail.montclair.edu.
authors.forename: Huan
authors.initials: H
authors.lastname: Feng
authors.affiliation: State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, People's Republic of China.
authors.forename: Weiguo
authors.initials: W
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, People's Republic of China.
authors.forename: Wenliang
authors.initials: W
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, People's Republic of China.
authors.forename: Lizhong
authors.initials: L
authors.lastname: Yu
authors.affiliation: Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ, 07043, USA.|School of Ecology and Environmental Sciences, Yunnan University, Kunming, Yunnan, 650091, People's Republic of China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Qian
authors.affiliation: Photon Sciences Directorate, Brookhaven National Laboratory, Upton, NY, 11973, USA.
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.affiliation: Photon Sciences Directorate, Brookhaven National Laboratory, Upton, NY, 11973, USA.
authors.forename: Jia-Jun
authors.initials: JJ
authors.lastname: Wang
authors.affiliation: Photon Sciences Directorate, Brookhaven National Laboratory, Upton, NY, 11973, USA.
authors.forename: Christopher
authors.initials: C
authors.lastname: Eng
authors.affiliation: Biological, Environmental & Climate Sciences Department, Brookhaven National Laboratory, Upton, NY, 11973, USA.
authors.forename: Chang-Jun
authors.initials: CJ
authors.lastname: Liu
authors.affiliation: Biological, Environmental & Climate Sciences Department, Brookhaven National Laboratory, Upton, NY, 11973, USA.
authors.forename: Keith W
authors.initials: KW
authors.lastname: Jones
authors.affiliation: Photon Sciences Directorate, Brookhaven National Laboratory, Upton, NY, 11973, USA.
authors.forename: Ryan
authors.initials: R
authors.lastname: Tappero
mesh_terms: D002681:China; D008670:Metals / Q000032:analysis / Q000378:metabolism*; D018517:Plant Roots / Q000737:chemistry / Q000378:metabolism*; D006109:Poaceae / Q000378:metabolism*; D045483:Rivers; D017356:Synchrotrons; D014131:Trace Elements / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D055114:X-Ray Microtomography; D014965:X-Rays
chemical_list: D008670:Metals; D014131:Trace Elements; D014874:Water Pollutants, Chemical
keywords: Rhizosphere root system; Spartina alterniflora; Synchrotron radiation technique; Trace metals; Transport; Yangtze River estuary