Concentrations of Heavy Metals in Suburban Horticultural Soils and Their Uptake by Artemisia selengensis

详细信息    查看全文

• 作者：Xu CUI^a ; ^b ; ^c ; Xulei SUN^a ; Pengjie HU^a ; Cheng YUAN^a ; Yongming LUO^a ; ^d ; Longhua WU^a ; ^{lhwu@issas.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Peter CHRISTIE^a
• 关键词：concentration factor ; plant uptake ; pollution source ; spatial distribution ; translocation factor ; vegetable
• 刊名：Pedosphere
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：25
• 期：6
• 页码：878-887
• 全文大小：538 K

文摘

A total of 222 surface soil samples and 40 plant samples were collected to investigate the spatial distribution and possible sources of soil heavy metals and to know the uptake and translocation of heavy metals from roots to different plant parts in a representative vegetable production area in the Baguazhou Island, a suburb of Nanjing City, East China. The arithmetic mean values of total Cd, Cr, Cu, Ni, Pb, and Zn concentrations in the soils were 0.314, 133, 41.0, 58.0, 31.8, and 114 mg kg⁻¹, respectively. All of these values were above the topsoil background values in the Nanjing area. Multivariate and geostatistical analyses showed that soil Cd contamination was derived mainly from agricultural practices. In contrast, Cu and Zn were derived mainly from soil parent materials and Pb from atmospheric deposition from highway gasoline stations. Artemisia selengensis, a locally important specialty vegetable, accumulated heavy metals primarily in the edible leaves. The general distribution of heavy metal concentrations in this plant species showed that the highest occurred in the leaves, intermediate in the stems and lowest in the roots. Cd had the highest concentration factor (root–to–soil ratio) and may pose increased health risks in the future to the local population through the consumption of contaminated vegetables.