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Investigation:

ND-03 (Deegan / Victoria / Krusche / Ballester)

LBA Dataset ID:

ND03_Poster_002

Originator(s):

1. Deegan, Linda A.
2. Krusche, Alex V.
3. Neill, Christopher
      4. Thomas, Suzanne M.
5. Victoria, Reynaldo Luiz

Point(s) of Contact:

Thomas, Suzanne M. (sthomas@mbl.edu)

Dataset Abstract:

Streams are important hydrologic and biogeochemical links between terrestrial and riverine systems. Landuse in the surrounding watershed has an important effect on dissolved and particulate inputs to streams. In recent decades, the tropics have undergone significant deforestation to clear land for agriculture and cattle grazing. We studied the effects of landuse change by examining small streams whose watersheds drain forest and/or cattle pasture in Rondonia, Brazil. We addressed the following questions: 1) How does landuse change from forest to pasture alter particulate and dissolved materials in small streams? and 2) How do these concentrations change as streams increase in size? To address these questions, we measured particulate and dissolved materials in small watersheds with single landuse (forest or pasture) and along a forest to pasture transect in a single stream.
We found that small streams from each landuse (forest or pasture) look quite different from each other and also from larger streams in mixed landuse drainage. For example, NO3 concentrations were low in the small pasture stream (4µM) and higher in the small forest stream (12µM), while concentrations after the confluence of these two streams (where landuse is pasture-dominated) remained around 8µM for the several remaining kilometers of the transect. These results highlight the importance of streams as a reflection of not only their landuse but also their size. From our data, we have found that it is not possible to simply extrapolate from small to larger streams because important shifts in in-stream processing occur as the stream gets larger.

Beginning Date:

None indicated.

Ending Date:

None indicated.

Metadata Last Updated on:

2004-09-07

Data Status:

Not Applicable

Access Constraints:

Public

Data Center URL:

Distribution Contact(s):

Luiz M. Horta

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.
Poster(s):

Search at ORNL DAAC

Keywords - Theme:

Parameter Topic Term Source Sensor
STREAM CHEMISTRY HYDROSPHERE SURFACE WATER   GROUND SAMPLING

Uncontrolled Theme Keyword(s):  Beija-flor, CHEMISTRY, LANDUSE, LBA DIS, PASTURE, RIVER, STREAM, poster

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Rondonia Fazenda Nova Vida -10.15600 -10.15600 -62.81100 -62.81100

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