Effect of Green Manure on Chemical Forms of Some Heavy Metalsin Soil by Distance from Rhizosphere of Corn

Document Type : Original Article

Authors

1 MSc Student of Soil Science College of Agriculture Isfahan University of Technology

2 Assistant Professor of Soil Science College of Agriculture Isfahan University of Technology

3 Professor of Soil Science College of Agriculture Isfahan University of Technology

Abstract

Environmental risk of heavy metals is associated with the changes of their chemical forms and bioavailability in soil. Therefore, distribution of metals in chemical forms in soil need to be more studied. To investigate the effects of alfalfa green manure (2% w/w) and root activity on chemical forms of lead, zinc, copper and nickel in a lead-zinc contaminated soil, a greenhouse experiment was conducted using rhizobox systems in a split plot design, with 3 replications, two levels of green manure (0 and 2%) and 4 zone by distance from root. Sequential extraction procedure (Tessier) was also carried out to differentiate the chemical forms of heavy metals in the soil samples. Results showed that the green manure addition enhanced dissolved organic carbon concentration (DOC) and reduced pH of the soil. It also increased exchangeable, organic matter-bound fractions and bioavailability of the metals. The highest and lowest values of DOC were found in rhizosphere and bulk soil respectively. The pH value in the rhizosphere was 0.4 times lower than in the bulk soil. Oxide fraction of metals increased with distance from the root that maybe related to the change of oxide fraction to other forms. Addition of green manure to the soil increased oxide fraction and bioavailability of lead in the rhizosphere that maybe approve the change of oxide form to more bioavailable forms. The results of plant analysis showed that green manure addition reduced the concentration of lead, zinc and copper and also reduced the uptake of lead and copper in shoots of corn.

Keywords

References

References
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Applied Soil Research
Volume 1, Issue 2 - Serial Number 2
Vol: 1, No: 2
February 2014
Pages 101-113

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History

  • Receive Date: 01 July 2013
  • Revise Date: 02 January 2014
  • Accept Date: 20 February 2016

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