Effects of Arbuscular mycorrhiza on growth and rehabilitation of Acacia mangium ability on coal mine tailings in nursery
Abstract
The bioremediation that combined between microbialremediation and phytoremediation would be potentially and effectively applied for cleaning up contaminated sites, especially the abandoned mining areas with their contaminated tailings to restore the ecosystems, landscape, their natural vegetation, forests with inherent natural values. The coal mine tailings of Chinh Bac and Nam Deo Nai (Quang Ninh) were collected and used for the study on effects of Arbuscular mycorrhiza (AM) on Acacia growth and its rehabilitation ability to the contaminated soils at nursery of Institute for Forest Ecology and Environment. Each Acacia was planted in 10 kg pots and inoculated with 400 IP AM inoculums per plant, control Acacia was planted in same pots but without AM.
After 6 months of experiment, the results showed that, diameter growth of the AM inoculated Acacia (DBH) was significantly higher than that in control 30 - 35%. All the checked parameters of soil physical and chemical characteristics (pH KCl, P2O5, K2O, humus, mechanical components) of the substrates with AM inoculated were found to be remarkably improved after 6 months of the experiment as compared to those in control and those before experiment (zero baseline). The cleaning up of heavy metals in the tailings was also examined and found that all the contents of As, Pb and Cd were decreased significantly after 6 months of the experiments as compared to those from the zero baseline, of which As reduced from 0.3 to 1.1 mg/1000g soil, Pb decreased from 1.1 to 2.4 mg/1000g soil and Cd fallen from 0.2 to 0.5 mg/1000 soil. The number of infective propagules (IP) in AM inoculated pots increased 5.5 times as compared to that in control for both types of mine tailings (As zero baseline, the original mine tailings were found with no AM IP). Rhizobium symbiotic nitrogen fixation of applied inoculated AM biomass plot significantly up to both in number, size and morphology; Microbes decompose phosphate of applied biomass AM treatments infections has changed the than those uninoculated AM treatments.
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