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| Effect of maize(Pteris vittata L.) intercropping on remediation of As-contaminated farmland soil |
| Received:July 15, 2016 |
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| KeyWord:intercropping;As;maize;Pteris vittata;effect |
| Author Name | Affiliation | E-mail | | QIU Dan | College of Agriculture, Guangxi University, Nanning 530004, China
Guangxi Key Laboratory of Agri-Environment and Agri-products Safety, Nanning 530000, China | | | DU Rui-ping | College of Agriculture, Guangxi University, Nanning 530004, China
Guangxi Key Laboratory of Agri-Environment and Agri-products Safety, Nanning 530000, China | | | MENG De-kai | College of Agriculture, Guangxi University, Nanning 530004, China
Guangxi Key Laboratory of Agri-Environment and Agri-products Safety, Nanning 530000, China | | | GU Ming-hua | College of Agriculture, Guangxi University, Nanning 530004, China
Guangxi Key Laboratory of Agri-Environment and Agri-products Safety, Nanning 530000, China | | | HE Bing | College of Agriculture, Guangxi University, Nanning 530004, China
Guangxi Key Laboratory of Agri-Environment and Agri-products Safety, Nanning 530000, China | | | WEI Yan-yan | College of Agriculture, Guangxi University, Nanning 530004, China
Guangxi Key Laboratory of Agri-Environment and Agri-products Safety, Nanning 530000, China | | | WANG Xue-li | College of Agriculture, Guangxi University, Nanning 530004, China
Guangxi Key Laboratory of Agri-Environment and Agri-products Safety, Nanning 530000, China | wxl0524@126.com |
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| Abstract: |
| Arsenic, as a common metalloid element in the earth's crust, can enter the body by the food chain and does great damages to human health eventually. To explore the effect of crops-hyperaccumulation plants intercropping on remediation of As-contaminated farmland ecosystem, the effect of open intercropping, restrictive intercropping and monocropping on growth, As uptake and accumulation in maize(Zea mays L.) and Pteris vittata L. were investigated in a pot experiment. The results showed that:compared with monocropping, open intercropping and restrictive intercropping significantly increased the shoot biomass of Pteris vittata L. by 55.7% and 43.9%, respectively, but did not exert significant effect on maize biomass. As concentration in stems, leaves and corn kernel of restrictive intercropping as well as open intercropping maize were lower than those of monoculture maize,but no significant differences of As concentration in roots occurred among the three cultures. The decreased extents in As concentration of open intercropping and restrictive intercropping were 35.2% and 31.9% in stems, 21.9% and 18.6% in the leaves, and 24.2% and 12.1% in the corn kernel, respectively. Compared with monoculture, restrictive intercropping significantly increased As concentration of Pteris vittata shoots by 11.3%, but had no obvious effect on As concentration in Pteris vittata-roots, while open intercropping significantly increased As concentration of Pteris vittata in both roots by 32.4% and shoots by 17.9%, respectively. Open intercropping significantly reduced available arsenic concentration in maize and Pteris vittata rhizosphere soil, the decrease extents were 9.3% and 15.4%, respectively. Restrictive intercropping significantly reduced available arsenic concentration in maize rhizosphere soil by 9.1%, but had no obvious effect on available arsenic concentration in Pteris vittata rhizosphere soil. The results suggested that Maize(Pteris vittata L.) intercropping inhibited the As accumulation in maize, while promoted the growth, As uptake and accumulation in Pteris vittata L.. The results would provide a guidance for the safe use of low to moderate levels of arsenic contaminated farmland. |
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