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| Effects of three clay minerals on the growth and heavy metal content in Vicia faba |
| Received:July 10, 2018 |
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| KeyWord:clay minerals;Vicia faba;photosynthesis;mineral nutrition;heavy metal pollution |
| Author Name | Affiliation | E-mail | | ZHANG Jin-xiu | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | HE Yong-mei | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Bo | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | WANG Can | China Metallurgical Geology Bureau Kunming Institute Survey, Kunming 650203, China | | | LI Tian-guo | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | QIN Li | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAN Fang-dong | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | zfd97@ynau.edu.cn | | LI Yuan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | |
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| Abstract: |
| Polluted soils from farmland around a lead-zinc mine in Huize County, Yunnan Province,were sampled and used in the present pot experiment. Three clay minerals (zeolite, sodium bentonite, and diatomite) were added to the polluted soils, which were used to grow Vicia faba in a greenhouse. The effects of these clay minerals on the photosynthesis, biomass, mineral nutrition, and content and accumulation of heavy metals in Vicia faba were investigated. The results showed the following:Photosynthesis in the leaves was enhanced significantly and biomass of Vicia faba increased with the three treatments; the biomass increased by 21.7% for the sodium bentonite addition. The available nitrogen (N), phosphorus (P), and potassium (K) content in the soils were reduced by 12%~48% with the clay minerals treatments. The N, P, and K content in the roots of the Vicia faba increased by 23%~83% with the addition of diatomite,but decreased in the shoots of the plants with the addition of sodium bentonite. The content of available lead (Pb) and copper (Cu) in the soils decreased significantly with the addition of the three clay minerals.The zinc (Zn) content in the plants and the Pb and Cu content in the roots decreased. In addition, the content of available cadmium (Cd) in the soils and in the plants, and the Pb content in the shoots of the Vicia faba, fell significantly with the addition of zeolite. Significant positive correlations were observed between the content of available Cd in soils and Cd content in shoots; the content of available Cu in soil and Cu content in roots; and the content of available Zn in soil and Zn content in the plants. The results indicate that clay minerals could decrease the bioavailability of heavy metals in polluted soils, reduce the heavy metal content in plants, and improve the photosynthesis and biomass of Vicia faba. |
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