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Investigation:

ND-11 (Lehmann / Passos / Couto)

LBA Dataset ID:

ND11_CPOM

Originator(s):

1. SELVA, E.C.
2. COUTO, E.G.
      3. JOHNSON, M.S.
4. LEHMANN, J.

Point(s) of Contact:

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Dataset Abstract:

This data set contains stream water exports of coarse particulate organic matter (CPOM) and coarse particulate organic carbon (CPOC) during 2003-2004 from four forested headwater streams near Juruena, Mato Grosso, Brazil. Data are reported in a single comma-separated ASCII file as watershed exports in mass units, carbon content, and watershed exports per watershed area over the reported sampling intervals. Resolving the carbon balance in the Amazonian forest depends on an improved quantification of production and losses of particulate C from forested landscapes via stream export. The export of coarse organic particulate matter (>2 mm) was quantified for one year in four small watersheds (1-2 ha) under native forest in southern Amazonia near Juruena, Mato Grosso, Brazil. Stream-water exports of particulate C were positively correlated with stream flow, increasing in the rainiest months. The export of particulate C in stream flow was found to be a small (less than 1%) percentage of the amount of litterfall produced.

Beginning Date:

2003-09-15

Ending Date:

2004-09-13

Metadata Last Updated on:

2009-03-31

Data Status:

Archived

Access Constraints:

PUBLIC

Data Center URL:

http://daac.ornl.gov/

Distribution Contact(s):

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Access Instructions:

PUBLIC

Data Access:

IMPORTANT: The LBA-ECO Project website is no longer being supported. Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC. Please follow the fair use guidelines found in the dataset documentation when using or citing LBA data.
Datafile(s):

LBA-ECO ND-11 Organic Carbon Watershed Exports, Mato Grosso, Brazil: 2003-2004 :  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=913

Documentation/Other Supporting Documents:

LBA-ECO ND-11 Organic Carbon Watershed Exports, Mato Grosso, Brazil: 2003-2004 :  http://daac.ornl.gov/LBA/guides/ND11_Carbon_Export_CPOM.html

Citation Information - Other Details:

Selva, E.C., E.G. Couto, M.S. Johnson and J. Lehmann. 2009. LBA-ECO ND-11 Organic Carbon Watershed Exports, Mato Grosso, Brazil: 2003-2004. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/913.

Keywords - Theme:

Parameter Topic Term Source Sensor
ORGANIC CARBON TERRESTRIAL HYDROSPHERE SURFACE WATER LABORATORY CARBON ANALYZER
ORGANIC MATTER TERRESTRIAL HYDROSPHERE SURFACE WATER FIELD INVESTIGATION WEIGHING BALANCE

Uncontrolled Theme Keyword(s):  CARBON CYCLE, CARBON EXPORT, MICROBASINS

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
  MATO GROSSO -10.42490 -10.42490 -58.75970 -58.75970

Related Publication(s):

Johnson, M.S., J. Lehmann, E.C. Selva, M. Abdo, S. Riha, and E.G. Couto. 2006. Organic carbon fluxes within and streamwater exports from headwater catchments in the southern Amazon. Hydrological Processes 20(12):2599-2614.

Johnson, M.S., J. Lehmann, S.J. Riha, A.V. Krusche, J.E. Richey, J.P.H.B. Ometto, and E.G. Couto. 2008. CO2 efflux from Amazonian headwater streams represents a significant fate for deep soil respiration. Geophysical Research Letters 35(L17401) doi10.1029/2008GL034619.

Selva, E.C., E.G. Couto, M.S. Johnson, and J. Lehmann. 2007. Litterfall production and fluvial export in headwater catchments of the southern Amazon. Journal of Tropical Ecology 23:329-335. doi:10.1017/S0266467406003956.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

One Comma-delimited ASCII file is provided. There are no missing values.



CPOM_export.csv





Column Description

---column 1: Location; identifier for headwater stream

---column 2: Date; sample collection date in yyyy/mm/dd format

---column 3: CPOM_mass; coarse particulate organic matter (CPOM) (g)

---column 4: CPOC_mass; coarse particulate organic carbon (CPOC) (g)

---column 5: C-content-of-CPOM; carbon content of CPOM (%)

---column 6: CPOM_mass-per-WS-area; coarse particulate organic matter (CPOM) export (g/m2 watershed area)

---column 7: CPOC_mass-per-WS-area; coarse particulate organic carbon (CPOC) export (g/m2 watershed area)



Example Data Records





Location,Date,CPOM_mass,CPOC_mass,C-content-of-CPOM,CPOM_mass-per-WS-area,CPOC_mass-per-WS-area

B1,2003/09/15,115.80,54.99,47.49,0.0138,0.0065

B1,2003/09/22,22.62,10.27,45.39,0.0027,0.0012

B1,2003/10/04,69.14,29.91,43.26,0.0082,0.0036

...

B4,2004/07/29,36.07,15.97,44.28,0.0031,0.0014

B4,2004/08/20,28.61,12.67,44.28,0.0024,0.0011

B4,2004/09/13,34.68,15.36,44.28,0.0029,0.0013

Data Application and Derivation:

Resolving the carbon balance in the Amazonian forest depends on an improved quantification of production and losses of particulate C from forested landscapes via stream export. The export of coarse organic particulate matter (>2 mm) was quantified for one year in four small watersheds (1-2 ha) under native forest in southern Amazonia near Juruena, Mato Grosso, Brazil. Stream-water exports of particulate C were positively correlated with stream flow, increasing in the rainiest months. The export of particulate C in stream flow was found to be a small (less than 1%) percentage of the litterfall produced.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

No known problems with data.

Process Description:

Data Acquisition Materials and Methods:

Samples were collected using weir traps at the four watershed outlets. A coarse organic matter trap was fixed on the downstream side of the weirs, consisting of a box frame (1 m3) lined with 2-mm mesh on its top, bottom and all sides except on the weir side (i.e. entrance to the trap). The bottom of the box was attached 15 cm below the weir notch so as to not impede free discharge over the weir, and the exit side of the box was fitted with a panel that could be raised to facilitate collection of material retained in the trap.



These weir trap collectors were made from plastic mesh and were installed such that all coarse particulate matter exported from the watersheds was retained in the trap and was removed during routine sample collection. The traps were constructed in the shape of a cube (1m on all sides), with the bottom opening to the trap located below the base of the V-notch so as to not interfere with the free discharge of water over the weir. Samples from the weir traps were collected approximately weekly during the rainy season and biweekly during the dry season. Of these samples, 16 were analyzed for particle size distribution following air drying in the laboratory, and were evenly distributed between the two seasons.



Stream flow CPOM exports were dried to constant mass (70 C) and ground on a Wiley mill. Samples were analyzed in the Limnology Laboratory of the Federal University of Mato Grosso for C concentration on a total carbon analyzer (Multi N/C, Analytik Jena, Jena, Germany) with an inline furnace for analysis of solid samples (Eltra HTF-540, Neuss, Germany). Ground samples were introduced into the 1300 C furnace where all carbonaceous materials were converted to CO2, which was immediately analyzed by infrared gas analysis. Exports were determined from the amount of CPOM retained on the weir traps during the collection interval.

References:

Buurman, P., Van Lagen, B. & Velthorst, E.J. 1996. Manual for soil and water analysis. Backhuys Publishers, Leiden. 314 pp.



Johnson, M.S., J. Lehmann, E.C. Selva, M. Abdo, S.J. Riha, and E.G. Couto. 2006. Organic carbon fluxes within and streamwater exports from forested headwater catchments in the southern Amazon. Hydrological Processes 20: 2599-2614.



E.C. Selva, E.G. Couto, M.S. Johnson and J. Lehmann. 2007. Litterfall production and fluvial export in headwater catchments of the southern Amazon. Journal of Tropical Ecology 23:329-335. doi:10.1017/S0266467406003956.

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