Abstract:
:Streamwater is affected by several processes in the watershed including anthropogenic activities that result in changes in water quality as well as in the functioning of these stream ecosystems. Therefore, this work aims to evaluate the concentration of major ions (Ca(2+), Mg(2+), Na(+), K(+), NH4(+), NO3(-), NO2(-), Cl(-), SO4(2-), PO4(3-), HCO3(-)) in streams in the state of São Paulo (southeast Brazil). The sampling sites are located at undisturbed (ombrophilus dense forest, semideciduous forest and savanna - cerrado) and disturbed areas (pasture, urbanization and sugar cane crops). Streamwater chemistry varied according to land use change and, in general, was higher in disturbed sites. Streams located in undisturbed sites at Ribeira de Iguape/Alto Paranapanema watershed (streams 1, 2 and 3) seem to be regulated by soil characteristics, as the disturbed streams located at the same watershed covered by pasture (stream 7) showed high concentration for the most of the variables. Exception to streams located at Pontal do Paranapanema watershed where both disturbed (stream 8) and undisturbed streams (stream 4 and 5) presented similar patterns for almost all variables measured.
journal_name
An Acad Bras Ciencjournal_title
Anais da Academia Brasileira de Cienciasauthors
Silva DM,Camargo PB,McDowell WH,Vieira I,Salomão MS,Martinelli LAdoi
10.1590/s0001-37652012000400007subject
Has Abstractpub_date
2012-12-01 00:00:00pages
919-30issue
4eissn
0001-3765issn
1678-2690pii
S0001-37652012000400007journal_volume
84pub_type
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