کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4571248 1629228 2015 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cadmium accumulation in six common plant species associated with soils containing high geogenic cadmium concentrations at Le Gurnigel, Swiss Jura Mountains
ترجمه فارسی عنوان
تجمع کادمیوم در شش گونه مشترک گیاهی مرتبط با خاک هایی که حاوی غلظت بالای کادمیوم ژئوشیمیایی در لگو گنیگلل، کوه سوئیس یورا
کلمات کلیدی
جورا، کادمیوم، گیاهان، خاک استخراج متوالی، قابلیت دسترسی به بی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


• Soils on Bajocian carbonate geogenically enriched in Cd in western Switzerland
• Cd fractionation between bulk and rhizospheric soils may increase bioavailable Cd.
• Cd in shoots of A. xanthochlora, C. cristatus and H. maculatum is up to 3–13 mg·kg− 1.
• Cd transfer to plants depends on Cd content in soils and type of soil.
• Plants may represent a long-term hazard for animals and human health.

The uptake of cadmium (Cd) was analyzed for six different perennial plant species growing in a wooded pasture of the Swiss Jura Mountains, where the soils are geogenically enriched in Cd (4.58 mg·kg− 1 on average (n = 36); maximal value: 16.3 mg·kg− 1). The six selected plants — Hypericum maculatum (Hypericaceae), Alchemilla xanthochlora (Rosaceae), Cynosurus cristatus (Poaceae), Ranunculus acris (Ranunculaceae), Dactylis glomerata (Poaceae) and Acer pseudoplatanus (Sapindaceae) — show variable Cd contents among the species and among individuals from the same family (Poaceae). Average Cd concentrations in the selected plants are in the 2–6 mg·kg− 1 range and exceed the maximal Cd concentration tolerated in vegetal feed for animals, which is established at 1 mg·kg− 1. High Cd concentrations in the soil result in a reduction of Cd accumulation in the shoots and a corresponding increase in the roots. This implies that Cd transfer coefficients from the soil/rhizosphere to the plant are inversely proportional to the total Cd concentrations in soils and do not depend on plant species but instead on soil type. Sequential chemical extractions reveal that variations in Cd distribution between the bulk soil and the corresponding rhizospheric soil occur mainly in the Cd-bearing phases, which are exchangeable, bound to carbonates, and associated with organic matter. This is principally due to the incorporation of root exudates, which modify pH and redox conditions of the rhizosphere. Elevated Cd concentrations in the shoots of A. xanthochlora (up to 8 mg·kg− 1), C. cristatus (9 mg·kg− 1) and H. maculatum (3 mg·kg− 1) may represent a long-term hazard for livestock and human health since these plants are used either by grazing cattle or for medicinal purposes. On the contrary, R. acris, A. pseudoplatanus, and especially D. glomerata show lower Cd concentrations and are of minor concern with regards to their environmental impact.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: CATENA - Volume 124, January 2015, Pages 85–96
نویسندگان
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