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Investigation:

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

LBA Dataset ID:

ND03_Poster_001

Originator(s):

1. Neill, Christopher
2. Deegan, Linda A.
3. Cerri, Carlos C.
4. Thomas, Suzanne M.
5. Steudler, Paul A.
      6. Victoria, Reynaldo Luiz
7. Piccolo, Marisa de Cassia
8. Garcia-Montiel, Diana Cecilia
9. Krusche, Alex V.
10. Melillo, Jerry M.

Point(s) of Contact:

Neill, Christopher (cneill@mbl.edu)
Thomas, Suzanne M. (sthomas@mbl.edu)

Dataset Abstract:

We examined how forest clearing for pasture influences soil nitrogen and phosphorus cycles, stream physical characteristics and the concentrations of major forms of dissolved and particulate N and P in the water of two pairs of second-order streams draining forest or pasture in the cattle ranching region of central Rondônia. Upland (terra firme) soils of established pastures had lower rates of net N mineralization and net nitrification than forest soils. Pasture soils had lower solution NO3- concentrations but higher solution dissolved organic N (DON) concentrations than forest soils. These patterns were linked to lower NO3- and higher DON concentrations in pasture streams. DON dominated streamwater total N concentrations in forest (43-53%) and pasture (54-55%), suggesting that DON is the major form of N export from small watersheds in either land use. Higher dissolved inorganic N concentrations in forest streams coupled with higher DON and PON concentrations in pasture led only small differences in total N concentrations between land uses. Pasture streams were also narrower and deeper than forest streams and had dissolved oxygen concentrations that remained very low (<2 mg/L) during both wet and dry seasons. Changes to stream characteristics, nutrient inputs and control of aquatic primary production caused by forest conversion to pasture have the potential to alter habitat quality and aquatic food webs of larger Amazonian streams and rivers. These links between deforestation, nutrient delivery to aquatic ecosystems and the structure and productivity of Amazonian rivers remain a largely unexplored consequence of deforestation.

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, SOIL, 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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