Changes in limnological variables of water reservoir in Juiz de Fora due to land use

Revista Brasileira de Engenharia Agrícola e Ambiental

Silva, Thiago M. da¹  Freitas, Fabiano A.¹  Rocha, Cézar H. B.¹ 

[1] UFJF, Juiz de Fora

关键词: water resources;    hydrographic basin;    seasonality;    principal component analysis    Introdução Dentre os múltiplos usos dos recursos hídricos a utilização para fins de consumo humano e dessedentação de animais é prioritária;    como assegurada por Lei Federal;   

DOI  :  10.1590/S1415-43662014000400011

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

The processes that promote changes in limnological variables are large and require studies that consider the peculiarities of the basins of contribution, as well as the use and coverage of their areas. This article aimed to compare the dynamics of limnological parameters of Dr. Joao Penido reservoir in Juiz de Fora - State of Minas Gerais in different rainfall regimes, as well as understanding the active mechanisms in the variation of the same ones. Student's t-test has revealed the occurrence of significant seasonal variation for the parameters: color, turbidity, iron, electrical conductivity and biochemical oxygen demand. Through factor analysis/principal components analysis variable pH was excluded for not contributing to the variance of all data, highlighting among the studied variables, which contributed more to influence water quality. The first four components were used which explained 71% of the total variance of the data, indicating the runoff as a determinant of the variables of the first and second components; the organic contribution, not associated with the precipitation, as suggestive of the variables of the third component; and intrinsic functional dynamics of the aquatic environment as indicative of the fourth component.

【 授权许可】

CC BY-NC