the chemistry of two streams draining kaolinitic soils daniel markewitz (univ. of georgia) ricardo...
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![Page 1: The chemistry of two streams draining kaolinitic soils Daniel Markewitz (Univ. of Georgia) Ricardo Figueiredo (EMBRAPA) Eric Davidson (Woods Hole Research](https://reader035.vdocuments.us/reader035/viewer/2022062619/5515512655034673228b64b2/html5/thumbnails/1.jpg)
The chemistry of two streams draining kaolinitic soils
Daniel Markewitz (Univ. of Georgia)Ricardo Figueiredo (EMBRAPA)
Eric Davidson (Woods Hole Research Center)Mercedes Bustamante, Lucilia Parron, and Julio
Resende (Univ. de Brasilia)
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Objectives:
• To develop a biogeochemical understanding of streams draining watersheds comprised of highly weathered soils in the Amazon and Cerrado.
• Compare seasonal patterns of cation concentrations.
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Observation of anomalous patterns of increasing streamwater cation concentrations with increasing stream flow.
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Mortatti and Probst 2003, Chemical Geology
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Streams (Igarapés):Cq = Igarapé Cinquenta e quatroSt = Igarapé do SetePj = Igarapé Pajeú
Study Area: Fazenda Vitoria, Paragominas, Para
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Marques et al., 2003Geoderma
Soilscapes in the Cerrado
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Gleissolo Haplico
Plintossolo Argiluvico
Plintossolo Haplico
Latossolo Amarelo0-5 760
5-20 820
20-40 840
40-70 860
70-120 840
0-10 360
10-20 440
20-40 600
40-60 660
60-90 440
90-120 480
Depthcm
Clay g/kg
0-10 380
10-20 480
20-40 580
40-60 600
60-90 620
90-120 600
Microbasin weir
Groundwater well
Soil profile description (Tarcísio Ewerton Rodrigues, EMBRAPA)
Soilscapes in the Eastern Amazon
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Soil chemical componentsIn soils of the Fazenda Vitoria and the IBGE
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Stream chemical componentsin the Fazenda Vitoria and the IBGE Reserve
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Stage Ht x Concentration relationship for Ca
IBGE Reserve
Stage Ht (cm)
0 20 40 60
Ca
(ueq
/L)
0
20
40
60
80
100
120
140 Fazenda Vitoria
Stage Ht (cm)
100 200 300 400
Ca
(ueq
/L)
0
50
100
150
200Ca=41.9 + -0.396 * Ht
r2=0.1
Ca=48.7 + 0.49 * Ht
r2=0.2
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Stability diagram
Log (H4SiO4)
-7-6-5-4-3-2-1
Lo
g (
K+
/H+
)
-2
0
2
4
6
Fazenda VitoriaIBGE Reserve
K-mica
Gib
bsi
te
K-feldspar
Kaolinite
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Ternary diagram for silicate weathering
Cl+SO40 10 20 30 40 50 60 70 80 90 100
HCO3
0
10
20
30
40
50
60
70
80
90
100
Si
0
10
20
30
40
50
60
70
80
90
100
IBGE ReserveFazenda Vitoria
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SO4
0 10 20 30 40 50 60 70 80 90 100
HCO3
0
10
20
30
40
50
60
70
80
90
100
Cl
0
10
20
30
40
50
60
70
80
90
100
IBGE ReserveFazenda Vitoria
Mg0 10 20 30 40 50 60 70 80 90 100
Na+K
0
10
20
30
40
50
60
70
80
90
100
Ca
0
10
20
30
40
50
60
70
80
90
100
IBGE ReserveFazenda Vitoria
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Conclusion
• Soil-stream systems in the IBGE do not present anomalous patterns for cation concentrations.
• Both soilscapes are in equilibrium will kaolinite and continue to desilicate.
• Stream cation-anion balances in Fazenda Vitoria are unusually and may be receiving important sea salt inputs.