Publicação
Evaluation of soil amendments used on the production of Eucalyptus globulus Labill. in marginal soils contaminated by a pyrite mine
| Resumo: | Soils affected by mining activities can be remediated in situ by the application of amendments, which improve soil properties, immobilizing contaminants and, eventually, with help of rhizospheric microorganisms, be used to produce plants with a valorization purpose. Some soil amendments can provide organic maxer, nutrients and correct soil acidity, while enhancing soil’s structure, root penetration and water retention on fine textured soils. This study aimed to evaluate the use of soil amendments and arbuscular mycorrhizal fungi (AMF) on the production of Eucalyptus globulus Labill. in marginal soils contaminated by a pyrite mine, assessing their effects on plant productivity and soil chemical and physical properties. A pot experiment was conducted using soils developed in mining wastes, collected from the Aljustrel mining area (Iberian Pyrite Belt, pH 3.9, total Cu and Pb concentrations of 698 mg/kg and 2382 mg/kg, respectively). Four replicates per treatment were used to test different amendments: biochar (64 g/kg), municipal solid waste compost (MSWC) (64 g/kg), their combination at the same doses (64 g/kg + 64 g/kg), and oyster shell powder (11.3 g/kg, with a liming capacity similar to calcium carbonate) combined with MSWC (64 g/kg). Additionally, an AMF species, Rhizoglomus irregulare, was inoculated in a replicated experiment. After five months, the combination of MSWC and biochar led to the highest increase in soil organic maxer (4-fold compared to untreated soil), resulting in the greatest plant biomass production. MSWC with oyster shell powder significantly increased soil pH to approximately 6.5. MSWC application also reduced Cu and Pb uptake in eucalyptus, suggesting its potential for phytomanagement of similar soils. Water retention at field capacity improved with biochar or MSWC, with the greatest effect observed when both were combined. |
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| Autores principais: | Oliveira, Bruna Benvinda Câmara de |
| Assunto: | mining activities heavy metals phytoremediation compost biochar atividades mineiras metais pesados fitorremediação composto biochar |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | Soils affected by mining activities can be remediated in situ by the application of amendments, which improve soil properties, immobilizing contaminants and, eventually, with help of rhizospheric microorganisms, be used to produce plants with a valorization purpose. Some soil amendments can provide organic maxer, nutrients and correct soil acidity, while enhancing soil’s structure, root penetration and water retention on fine textured soils. This study aimed to evaluate the use of soil amendments and arbuscular mycorrhizal fungi (AMF) on the production of Eucalyptus globulus Labill. in marginal soils contaminated by a pyrite mine, assessing their effects on plant productivity and soil chemical and physical properties. A pot experiment was conducted using soils developed in mining wastes, collected from the Aljustrel mining area (Iberian Pyrite Belt, pH 3.9, total Cu and Pb concentrations of 698 mg/kg and 2382 mg/kg, respectively). Four replicates per treatment were used to test different amendments: biochar (64 g/kg), municipal solid waste compost (MSWC) (64 g/kg), their combination at the same doses (64 g/kg + 64 g/kg), and oyster shell powder (11.3 g/kg, with a liming capacity similar to calcium carbonate) combined with MSWC (64 g/kg). Additionally, an AMF species, Rhizoglomus irregulare, was inoculated in a replicated experiment. After five months, the combination of MSWC and biochar led to the highest increase in soil organic maxer (4-fold compared to untreated soil), resulting in the greatest plant biomass production. MSWC with oyster shell powder significantly increased soil pH to approximately 6.5. MSWC application also reduced Cu and Pb uptake in eucalyptus, suggesting its potential for phytomanagement of similar soils. Water retention at field capacity improved with biochar or MSWC, with the greatest effect observed when both were combined. |
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