Litterfall mercury deposition in Atlantic forest ecosystem from SE-Brazil.
Litterfall is believed to be the major flux of Hg to soils in forested landscapes, yet much less is known about this input on tropical environment. The Hg litterfall flux was measured during one year in Atlantic Forest fragment, located within Rio de Janeiro urban perimeter, in the Southeastern region of Brazil. The results indicated a mean annual Hg concentration of 238 ± 52 ng g(-1) and a total annual Hg deposition of 184 ± 8.2 μg m(-2) y(-1). The negative correlation observed between rain precipitation and Hg concentrations is probably related to the higher photosynthetic activity observed during summer. The total Hg concentration in leaves from the most abundant species varied from 60 to 215 ng g(-1). Hg concentration showed a positive correlation with stomatal and trichomes densities. These characteristics support the hypothesis that Tropical Forest is an efficient mercury sink and litter plays a key role in Hg dynamics.
Instituto de Química, Universidade Federal Fluminense, Centro - Niterói, RJ CEP 24.020-141, Brazil. danielcabralteixeira@yahoo.com.br
Daniel C
DC
Teixeira
Rita C
RC
Montezuma
Rogério R
RR
Oliveira
Emmanoel V
EV
Silva-Filho
D001267:Atlantic Ocean; D001938:Brazil; D017753:Ecosystem; D004784:Environmental Monitoring; D004787:Environmental Pollution / Q000706:statistics & numerical data; D008628:Mercury / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D014197:Trees
D012989:Soil Pollutants; D008628:Mercury