Details

Autor(en) / Beteiligte

• Gardiman, Benvindo Sirtoli, Jr
• de Oliveira Garcia, Giovanni
• Cecilio, Roberto Avelino
• Loos, Rodolfo Araujo
• Mafia, Reginaldo Goncalves
• Abad, Jupiter Israel Muro
• Simao, Joao Batista Pavesi
• Barbosa, Vitor Hugo Breda

Titel

KEY VARIABLES TO DETERMINATE THE WATER QUALITY IN WATERSHEDS WITH EUCALYPTUS PLANTATIONS/VARIAVEIS-CHAVE PARA DETERMINACAO DA QUALIDADE DA AGUA EM MICROBACIAS COM PLANTIOS DE EUCALIPTO

Ist Teil von

• Ciência florestal, 2018-01, Vol.28 (1), p.127

Ort / Verlag

Universidade Federal de Santa Maria

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• This work aimed to identify the main variables affected by natural factors and, or anthropic, which influence the quality of surface water in watersheds, managed for eucalyptus wood production. Water quality was monitored in four watersheds located in Aracruz, northern ES state, Brazil. The physical and chemical characteristics of the water and the potential presence of pesticides used in forest management were evaluated. Samples were collected after the silvicultural activities and, or, rainfall between the months of January to June 2012. Principal component and factor analysis techniques were used to determine the water variables most sensitive and correlated with forestry activities, soil and climatic conditions of the study watersheds. It was possible to obtain four components that explained 73.1% of the total variance. The components were correlated with the variables and defined as factors mineral, solid, acidity, and pedological. These factors explained 31.6; 18.5; 15.6; and 7.4% of the total variance of the data which are directly related to salinity, the presence of suspended solids, acidity and the inorganic carbon content of the soil, respectively. Sulfluramid (insecticide) and glyphosate (herbicide) were not found. In general, it is possible to reduce from 30 to 12 variables that should be monitored for prediction of water quality, maintaining at least 70% of the precision of the estimates. The evaluation of these key variables allows establishing an adequate monitoring system of water quality considering the eucalyptus forestry activities. Keywords: forest management; forest hydrology; water quality index; multivariate statistics. O presente trabalho objetivou identificar as principais variaveis afetadas por fatores naturais e, ou, antropicos, que influenciam a qualidade da agua superficial em microbacias hidrograficas, manejadas para producao de madeira de eucalipto. A qualidade da agua foi monitorada em quatro microbacias localizadas no municipio de Aracruz, norte do ES, Brasil. Para tanto, analisaram-se as caracteristicas fisicas e quimicas, bem como a potencial presenca na agua de agrotoxicos utilizados no manejo florestal. As coletas foram realizadas apos as atividades silviculturais e/ou ocorrencia de chuvas entre os meses de janeiro e junho de 2012. Foram utilizadas tecnicas de componentes principais e analise fatorial para determinar as variaveis mais sensiveis e correlacionadas com as atividades silviculturais e com as condicoes edafoclimaticas das microbacias. De forma geral, 4 componentes explicaram 73,1% da variancia total. Os componentes foram correlacionados com as variaveis analisadas e definidos como fatores: mineral, solido, acidez e pedologico. Estes fatores explicaram 31,6; 18,5; 15,6; e 7,4% da variancia total dos dados e estao diretamente relacionados com a salinidade, a presenca de solidos suspensos, a acidez e o teor de carbono inorganico do solo, respectivamente. Nao foi observada presenca dos agrotoxicos sulfluramida (inseticida) e glifosato (herbicida) em todas as avaliacoes realizadas. Em geral, e possivel reduzir de 30 para 12 as variaveis que devem ser monitoradas para predicao da qualidade da agua, mantendo pelo menos 70% da precisao das estimativas. Palavras-chave: manejo florestal; hidrologia florestal; indice de qualidade da agua; estatistica multivariada.