LBA-ECO ND-02 TRACE GAS FLUX FROM FOREST SOIL, PARA, BRAZIL: 1999-2001Entry ID: LBA_FERT
Abstract: Understanding secondary successional processes in Amazonian terrestrial ecosystems is becoming increasingly important as continued deforestation expands the area that has become secondary forest, or at least has been through a recent phase of secondary forest growth. Most Amazonian soils are highly weathered and relatively nutrient poor, but the role of nutrients as a factor determining ... successional processes is unclear. Soils testing and chronosequence studies have yielded equivocal results regarding the possible role of nutrient limitation. The objective of this paper is to report the first two years' results of a nitrogen (N) and phosphorus (P) fertilization experiment in a 6-yr-old secondary forest growing on an abandoned cattle pasture on a clayey Oxisol. Growth of remnant grasses responded significantly to the N + P treatment, whereas tree biomass increased significantly following N-only and N + P treatments. The plants took up about 10% of the 50kg P/ha of the first year's application, and recovery in soil fractions could account for the rest. The trees took up about 20% of the 100 kg N/ha of the first year's application. No changes in soil inorganic N, soil microbial biomass N, or litter decomposition rates have been observed so far, but soil faunal abundances increased in fertilized plots relative to the control in the second year of the study. A pulse of nitric oxide and nitrous oxide emissions was measured in the N-treated plots only shortly after the second year's application. Net N mineralization and net nitrification assays demonstrated strong immobilization potential, indicating that much of the N was probably retained in the large soil organic-N pool. Although P availability is low in these soils and may partially limit biomass growth, the most striking result of this study so far is the significant response of tree growth to N fertilization. Repeated fire and other losses of N from degraded pastures may render tree growth N limited in some young Amazonian forests. Changes in species composition and monitoring of long-term effects on biomass accumulation will be addressed as this experiment is continued.
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Data Set Citation
Dataset Originator/Creator: DAVIDSON, E.A.DE CARVALHO, C.J.R.FIGUEIREDO, R.O.VIEIRA, I.C.G.
Dataset Title: LBA-ECO ND-02 TRACE GAS FLUX FROM FOREST SOIL, PARA, BRAZIL: 1999-2001
Dataset Release Date: 2009
Dataset Release Place: Oak Ridge, Tennessee, U.S.A.
Dataset Publisher: Oak Ridge National Laboratory Distributed Active Archive Center
Data Presentation Form: Online Files
Dataset DOI: doi:10.3334/ORNLDAAC/954Online Resource: http://mercury.ornl.gov/ornldaac/send/query?term2=954&term2attribut...
Start Date: 1999-11-17Stop Date: 2001-12-12
Latitude Resolution: 0.0417 Decimal degrees
Longitude Resolution: 0.0417 Decimal degrees
Horizontal Resolution Range: 1 km - < 10 km or approximately .01 degree - < .09 degree
Quality The records of the Emergency Events Database (EM-DAT), collected over a 20 year period from 1981 to 2000, provide regional, hazard-specific mortality and economic loss rates. A crude estimation of the global earthquake hazard mortality is developed using the EM-DAT regional mortality rates, population distributions from Gridded Population of the World, Version 3 (GPWv3), and frequency/distribution ... data from Global Earthquake Hazard Distribution-peak ground acceleration. To better reflect the confidence associated with the result, mortality figures are classified into deciles, 10 classes of an approximately equal number of grid cells of increasing mortality (item Value). Building upon a methodology developed by Sachs et al. (2003), a Gross Domestic Product (GDP) value (US$, 2000, purchase power parity adjusted (PPP)) is estimated for each grid cell. The process begins by determining the contribution of each subnational unit to national GDP using data of varied origin. The ratio of the subnational production to the national GDP is the contribution ratio. To ensure uniformity between countries, these contribution ratios are utilized with published World Bank estimates of GDP.
Once a standardized version of subnational GDP has been calculated, this value is further divided by the total population within the subnational unit. This subnational, per-person GDP value is multiplied by the grid cell population density to determine a GDP value for the grid cell. The GDP values presented in this dataset (item Gdpvalue) are not projections of impacted GDP, but rather the estimates of GDP that serve as a baseline for estimating hazard impacts. Furthermore, Gdpvalue is indicative of the GDP associated with each of the hazard risk deciles and not the individual grid cell.
Estimating the agricultural GDP (item Agvalue) follows a process similar to GDP. The amount of agricultural GDP is derived at the subnational unit using available data of various origins.
Access Constraints None
Use Constraints The Trustees of Columbia University in the City of New York, Center for Hazards
and Risk Research (CHRR), and International Bank for Reconstruction and
... Development/The World Bank hold the copyright of this dataset. Users are
prohibited from any commercial, non-free resale, or redistribution without
explicit written permission from CHRR, CIESIN, and The World Bank. Users should
acknowledge CHRR, CIESIN, and The World Bank as the source used in the creation
of any reports, publications, new datasets, derived products, or services
resulting from the use of this dataset. CHRR, CIESIN, and The World Bank also
request reprints of any publications and notification of any redistribution
Data Set Progress
Role: TECHNICAL CONTACT
Phone: +1 845-365-8920
Fax: +1 845-365-8922
Email: ciesin.info at ciesin.columbia.edu
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Postal Code: 10964
Role: DIF AUTHOR
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Email: metadata at ciesin.columbia.edu
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Center for Hazards and Risk Research (CHRR)/Columbia University, and Center for International Earth Science Information Network (CIESIN)/Columbia University (2005), Global Earthquake Hazard Distribution - Peak Ground Acceleration, Center for Hazards and Risk Research (CHRR)/Columbia University, Palisades, NY, http://sedac.ciesin.columbia.edu/data/set/ndh-earthquake-distributi...
Center for Hazards and Risk Research (CHRR)/Columbia University, and Center for International Earth Science Information Network (CIESIN)/Columbia University (2005), Global Earthquake Hazard Frequency and Distribution, Center for Hazards and Risk Research (CHRR)/Columbia University, Palisades, NY, http://sedac.ciesin.columbia.edu/data/set/ndh-earthquake-frequency-...
Center for Hazards and Risk Research (CHRR)/Columbia University, Center for International Earth Science Information Network (CIESIN)/Columbia University, and International Bank for Reconstruction and Development/The World Bank (2005), Global Earthquake Proportional Economic Loss Risk Deciles, Center for Hazards and Risk Research (CHRR)/Columbia University, Palisades, NY, http://sedac.ciesin.columbia.edu/data/set/ndh-earthquake-proportion...
Center for Hazards and Risk Research (CHRR)/Columbia University, Center for International Earth Science Information Network (CIESIN)/Columbia University, and International Bank for Reconstruction and Development/The World Bank (2005), Global Earthquake Total Economic Loss Risk Deciles, Center for Hazards and Risk Research (CHRR)/Columbia University, Palisades, NY, http://sedac.ciesin.columbia.edu/data/set/ndh-earthquake-total-econ...
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2005-09-29
Last DIF Revision Date: 2013-02-13