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Previous issue date: 2014 / Funda??o de Amparo ? Pesquisa do estado de Minas Gerais (FAPEMIG) / Em se tratando da contamina??o de ecossistemas por res?duos de defensivos agr?colas, especial aten??o ? dada para a classe dos herbicidas, em fun??o do volume de aplica??o. Os que possuem mol?culas sol?veis pass?veis de contamina??o de len??is h?dricos subterr?neos se destacam pela abrang?ncia dos efeitos negativos. Nesse sentido, objetivou-se selecionar esp?cies vegetais arb?reas interessantes na remedia??o de ambientes contaminados por res?duos de atrazine e 2,4-D. Foram avaliados 36 tratamentos compostos pela combina??o de 12 esp?cies florestais [Inga marginata (ing?), Schizolobium parahyba (guapuruvu), Handroanthus serratifolius (ip? amarelo), Jacaranda puberula (carobinha), Cedrela fissilis (cedro), Calophyllum brasiliensis (landin), Psidium mirsinoides (goiabinha), Tibouchina glandulosa (quaresmeira), Caesalpinia f?rrea (pau-ferro), Caesalpinia pluviosa (sibipiruna), Terminalia arg?ntea (capit?o) e Schinopsis brasiliensis (bra?na)] e tr?s solu??es simulando o composto lixiviado (atrazine, 2,4-D e ?gua ? controle), com quatro repeti??es. Foram feitas 3 aplica??es dos herbicidas atrazine e 2,4-D com intervalos de 20 dias (aos 60, 80 e 100 dias ap?s o plantio), sendo cada aplica??o correspondente ? metade da dose comercial dos produtos. Para as avalia??es de crescimento foram mensuradas a altura da planta, o di?metro do caule, o n?mero de folhas, a ?rea foliar e o ac?mulo de biomassa seca. Na estimativa do efeito visual dos herbicidas ?s plantas avaliadas, optou-se pela atribui??o de notas em escala de intoxica??o. Para verifica??o de capacidade remediadora das esp?cies arb?reas procedeu-se a semeadura da esp?cie indicadora para indicativo do res?duo do herbicida no solo, (Cucumis sativus (L.)). Posteriormente em amostras de solo provenientes da esp?cie remediadora mais promissora procedeu-se a an?lise de polimorfismo de comprimento de fragmento de restri??o terminal (T-RFLP), com intuito de caracterizar a diversidade microbiana presente. As esp?cies florestais sobreviveram ? aplica??o dos herbicidas, sendo que umas se mostram mais sens?veis do que outras. O ing? apresentou bons resultados de remedia??o com o bioensaio, assim como o ip? amarelo, apesar da sua sensibilidade aos herbicidas. Observou-se aumento no conte?do relativo de macronutrientes para as plantas sob a??o dos herbicidas, na maioria dos tratamentos. Os resultados de T-RFLP confirmaram a diversidade microbiana diferenciada associada ? rizosfera de ing?, principalmente quando submetida ? a??o de atrazine. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Ci?ncia Florestal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2014. / ABSTRACT
In the case of contamination of ecosystems by residues of pesticides, special attention is given to the class of herbicides, according to the application volume. Those with likely contamination of underground water soluble molecules sheets are distinguished by breadth of negative effects. In this sense, the aim of this work was to select interesting woody plant species in the remediation of contaminated by residues of atrazine and 2,4-D environments. Were evaluated 36 treatments consisted of combinations of 12 forest species [Inga marginata (ing?), Schizolobium parahyba (guapuruvu), Handroanthus serratifolius (ip? amarelo), Jacaranda puberula (carobinha), Cedrela fissilis (cedro), Calophyllum brasiliensis (landin), Psidium mirsinoides (goiabinha), Tibouchina glandulosa (quaresmeira), Caesalpinia f?rrea (pau-ferro), Caesalpinia pluviosa (sibipiruna), Terminalia arg?ntea (capit?o) and Schinopsis brasiliensis (bra?na)] and three leachate solutions simulate the compound ( atrazine , 2,4 - D and water - control),with four replicates each. Three applications of atrazine and 2,4-D were made at intervals of 20 days (at 60, 80 and 100 days after planting), each application was corresponding to half of the recommended. Evaluations of growth were measured plant height, stem diameter, number of leaves, leaf area and dry biomass. In estimating the visual effect of herbicides on plants assessed, was opted for the grading scale of intoxication. To check remediation ability of tree species proceeded seeding indicator species for indication of herbicide residue in the soil (Cucumis sativus (L.)). Later in soil samples from the species most promising remedial proceeded to analysis of length polymorphism terminal restriction fragment (T-RFLP), in order to characterize the microbial diversity present. Forest species survived the herbicide application, and some are more sensitive than others. The ing? had good results with the remediation bioassay, as well as the ipe amarelo, despite their sensitivity to herbicides. Observed increase in the relative content of macronutrients for plants under the effect of herbicides in most treatments. The results of T-RFLP confirmed the differentiated microbial diversity associated with the rhizosphere of ing?, especially when subjected to the action of atrazine.
| Identifer | oai:union.ndltd.org:IBICT/oai:acervo.ufvjm.edu.br/jspui:1/338 |
| Date | 25 February 2014 |
| Creators | Fiore, Rebecca de Ara?jo |
| Contributors | Belo, Alessandra Ferreira, Ferreira, Evander Alves, Porto, Jorge Marcelo Padovani, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Santos, Jos? Barbosa dos |
| Publisher | UFVJM |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFVJM, instname:Universidade Federal dos Vales do Jequitinhonha e Mucuri, instacron:UFVJM |
| Rights | A concess?o da licen?a deste item refere-se ao ? termo de autoriza??o impresso assinado pelo autor, assim como na licen?a Creative Commons, com as seguintes condi??es: Na qualidade de titular dos direitos de autor da publica??o, autorizo a Universidade Federal dos Vales do Jequitinhonha e Mucuri e o IBICT a disponibilizar por meio de seus reposit?rios, sem ressarcimento dos direitos autorais, de acordo com a Lei n? 9610/98, o texto integral da obra disponibilizada, conforme permiss?es assinaladas, para fins de leitura, impress?o e/ou download, a t?tulo de divulga??o da produ??o cient?fica brasileira, e preserva??o, a partir desta data., info:eu-repo/semantics/openAccess |
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