HR: 1340h
AN: B43A-0124    [Abstracts]
TI: Major Ions Fluxes and DOC in Rainfall and Throughfall at the Tapajos National Forest - Belterra, Para, Brazil
AU: * Oliveira, R C
EM: cosme@cpatu.embrapa.br
AF: EMBRAPA-CPATU, TRAV. ENEAS PINHEIRO S/N, BELEM, PA 66095-100 Brazil
AU: Keller, M
EM: michael.keller@unh.edu
AF: UNIVERSITY OF NEW HAMPSHIRE, MORSE HALL, DURHAM, NH 03824 United States
AU: Crill, P
EM: patrick.crill@unh.edu
AF: UNIVERSITY OF NEW HAMPSHIRE, MORSE HALL, DURHAM, NH 03824 United States
AU: de Mello, w
EM: zamboni@geoq.uff.br
AF: UNIVERSIDADE FEDERAL FLUMINENSE, AV. BEIRA RIO, RIO DE JANEIRO, RJ 21000-000 Brazil
AU: Dias, J
EM: jadson@lbaeco.com.br
AF: ESALQ - USP, AV. JANAINA S/N, PIRACICABA, SP 11000-000 Brazil
AU: Oliveira, K
EM: kemerson@lbaeco.com.br
AF: LBAECO, RUA 24 DE MAIO, SANTAREM, PA 68000-000 Brazil
AU: Souza Neto, E
EM: eraclito@lbaeco.com.br
AF: LBAECO, RUA 24 DE MAIO, SANTAREM, PA 68000-000 Brazil
AU: Albuquerque, S
EM: sergio@lbaeco.com.br
AF: LBAECO, RUA 24 DE MAIO, SANTAREM, PA 68000-000 Brazil
AU: Dias, J
EM: joelma@lbaeco.com.br
AF: LBAECO, RUA 24 DE MAIO, SANTAREM, PA 68000-000 Brazil
AU: Pereira, C
EM: cleuton@lbaeco.com.br
AF: LBAECO, RUA 24 DE MAIO, SANTAREM, PA 68000-000 Brazil
AB: The Tapaj¢s National Forest -(FLONA Tapaj¢s), an area of 600,000 ha of protected forest, is located 50km south Santarem (Par , Brasil). The FLONA receives approximately 2000 mm.y-1 of rainfall and the forest is evergreen. The tropical forest nutrient cycle depends upon inputs from the atmosphere and from rock weathering. Internally, throughfall and stemflow transfer nutrients from the vegetation to the ground. We collected rainfall and throughfall from [starting date] through [ending date]. Concentrations of the ions Cl-, NO3-, PO4-3, SO4-2, Na+, NH4+, K+, Mg+2 and Ca+2 were analyzed using a Dionex DX-120 ion chromatograph. Total carbon and dissolved organic carbon were analyzed by a Shimadzu TOC V - CSN. Ionic fluxes were calculated from volume-weighted concentrations. The fluxes in precipitation followed the sequence: NH4+ (7.1 kg.ha-1.y-1) > Ca+2 (6.31 kg.ha-1.y-1) > Na+ (6.11 kg.ha-1.y-1) > K+ (4.41 kg.ha-1.y-1) > Cl- (3.61 kg.ha-1.y-1) > SO4-2 (3.11 kg.ha-1.y-1) > NO3- (1.31 kg.ha-1.y-1) > PO4-3 (1.11 kg.ha-1.y-1) > Mg+2 (1.01 kg.ha-1.y-1). In the throughfall, the fluxes were in the sequence: NO3- (31.8 kg.ha-1.y-1) > K+ (27.6 kg.ha-1.y-1) > NH4+ (25.5 kg.ha-1.y-1) > Na+ (17.4 kg.ha-1.y-1) > SO4-2 (15.6 kg.ha-1.y-1) > Cl- (14.5 kg.ha-1.y-1) > Ca+2 (12.7 kg.ha-1.y-1) > Mg+2 (11.1 kg.ha-1.y-1) > PO4-3 (10.8 kg.ha-1.y-1). The seasonality of cation and anion inputs suggests that intensive fertilized grain agricultural activity upwind of the site is contributing a substantial nutrient input to the forest. The fluxes of the total organic carbon for April 2003, May 2003 and February 2004 reached amounts of the 23, 18 and 34 kg.ha-1.y-1, respectively.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0315 Biosphere/atmosphere interactions
DE: 0335 Ion chemistry of the atmosphere (2419, 2427)
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting