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Description

This data set reports continuous high-resolution frequency-domain reflectometry measurements of soil moisture to 10 m depth and precipitation data near each of the two towers located at the km 83 tower site (logged forest site) in the Tapajos National Forest in the state of Para, Brazil. Measurements were made during 2002 and 2003. Soil moisture and precipitation data are provided in two comma-delimited ASCII files.

The first tower was installed in an intact forest area at this site in June 2000 (the 'intact' tower) and instrumented for eddy flux and micrometerological measurements and operated 15 months prior to any logging in the area (Goulden et al., 2004; Miller et al., 2004; Rocha et al., 2004). In September 2001, the area adjacent to the tower was selectively logged (Bruno et al., 2006).

The second tower (the 'gap tower' tower) was installed and operating in June 2002, 400 m east of the intact tower. The gap tower was installed in the middle of a 50 m x 50 m log landing.

Soil moisture measurements were made in 10 m deep vertical pits (1 x 1 m2) approximately 20 m from the micrometerological tower sites in undisturbed forest patches. Reflectometers were inserted horizontally into shaft walls at 0.15, 0.30, 0.60, 1, 2, 3, 4, 6, 8, and 10 meters beneath the surface. These data were used to determine how soil moisture varies on diel, seasonal and multi-year timescales and to better understand the quantitative and mechanistic relationships between soil moisture and forest evapotranspiration.

Product Summary

Platforms
FIXED OBSERVATION STATIONS ,
FIELD INVESTIGATION
Instruments
RAIN GAUGES ,
TDR
Spatial Extent

N: -3.017 S: -3.017 E: -54.9707 W: -54.9707

Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2001-12-31 to 2003-12-17
Data Partner
THE OAK RIDGE NATIONAL LABORATORY (ORNL) DISTRIBUTED ACTIVE ARCHIVE CENTER (DAAC) (ORNL_DAAC)
Concept ID
C2777815106-ORNL_CLOUD
Data State
COMPLETE
Number of Files/Granules
2
Processing Level
3
Published
Updated
Science Keywords
Precipitation Amount ,
Soil Moisture/Water Content

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Goulden, M. L., Miller, S. D., & da Rocha, H. R. (2010). LBA-ECO CD-04 Soil Moisture Data, km 83 Tower Site, Tapajos National Forest, Brazil (Version 1). ORNL Distributed Active Archive Center. https://doi.org/10.3334/ORNLDAAC/979 Date Accessed: 2026-05-01

Documents

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Publications Citing This Dataset

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Title Year Author Topic
Assessing impacts of selective logging on water, energy, and carbon budgets and ecosystem dynamics in Amazon forests using the Functionally Assembled ... Huang, Maoyi, Xu, Yi, Longo, Marcos, Keller, Michael, Knox, Ryan G., Koven, Charles D., Fisher, Rosie A. Biomass, Deforestation, Landscape Patterns, Forests, Canopy Characteristics, Land Resources, Precipitation Amount, Soil Moisture/Water Content
Numerical simulations of hydraulic redistribution across climates: The role of the root hydraulic conductivities Quijano, Juan C., Kumar, Praveen Precipitation Amount, Soil Moisture/Water Content
Modeling hydraulic redistribution and ecosystem response to droughts over the Amazon basin using Community Land Model 4.0 (CLM4) Yan, Binyan, Dickinson, Robert E. Precipitation Amount, Soil Moisture/Water Content, Respiration Rate
Data-Model Needs for Belowground Ecology. A Summary Report from the Terrestrial Ecosystem Science (TES) Mini-Workshop, May 8, 2014 Bailey, Vanessa, Hanson, Paul J., Jastrow, Julie, Torn, Margaret, Stover, Daniel Organic Matter, Soil Bulk Density, Soil Classification, Soil Depth, Soil Moisture/Water Content, Soil Texture, Phosphorus, Soil Chemistry, Soil Chemistry, Soil Respiration, Soil Respiration, Atmospheric Carbon Dioxide, Air Temperature, Precipitation Amount, Soil Water Holding Capacity, Biomass, Nutrients, Plant Characteristics, Photosynthetically Active Radiation, Carbon, Forests, Respiration Rate, Primary Production, Heat Flux, Sediment Transport, Carbon, Nitrogen, Land Use/Land Cover Classification, Vegetation Index, Vegetation Cover, Leaf Characteristics, Canopy Characteristics, Albedo, Reflectance, Water Table, Soil Classification, Geomorphic Landforms/Processes, Soil Color, Soil Horizons/Profile, Soil Structure, Soil Ph, Drainage, Terrain Elevation, Methane, Nitric Oxide, Nitrous Oxide, Litter Characteristics, Soil Gas/Air, Isotopes, Reforestation/Revegetation, Soil Gas/Air, Ammonia, Nitrogen Oxides, Ecosystem Functions, Cation Exchange Capacity, Suspended Solids, Forest Composition/Vegetation Structure, Leaf Area Index (LAI), Vegetation Species, Humidity, Soil Moisture, Soil Porosity, Nitrogen, Trace Gases/Trace Species, Soil Fertility, Permafrost, Calcium, Potassium, Magnesium, Total Dissolved Solids, Wetlands, Inundation, Soil Moisture/Water Content, Carbon, Nitrous Oxide, Discharge, Groundwater Chemistry, Discharge/Flow, Surface Water Chemistry, Biogeochemical Cycles
What drives the seasonality of photosynthesis across the Amazon basin? A cross-site analysis of eddy flux tower measurements from the Brasil flux network Restrepo-Coupe, Natalia, da Rocha, Humberto R., Hutyra, Lucy R., da Araujo, Alessandro C., Borma, Laura S., Christoffersen, Bradley, Cabral, Osvaldo M.R., de Camargo, Plinio B., Cardoso, Fernando L., da Costa, Antonio C. Lola, Fitzjarrald, David R., Goulden, Michael L., Kruijt, Bart, Maia, Jair M.F., Malhi, Yadvinder S., Manzi, Antonio O., Miller, Scott D., Nobre, Antonio D., von Randow, Celso, Sa, Leonardo D. Abreu, Sakai, Ricardo K., Tota, Julio, Wofsy, Steven C., Zanchi, Fabricio B., Saleska, Scott R. Precipitation Amount, Soil Moisture/Water Content
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