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    Completing below-ground carbon budgets for pastures, recovering forests, and mature forests of Amazonia (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This progress report covers the following efforts initiated for the year: year-round monthly soil CO2 flux measurements were started in both primary and secondary forests and in managed and degraded pastures; root sorting and weighing has begun and all four ecosystems at Paragominas have been analyzed through samples; regional modeling of soil water dynamics and minimum rooting depth has been done and the RADAMBRASIL soils database has been digitized and a 20 year record of the precipitation for the region has been produced, along with a hydrological ('bucket-tipping') model that will run within a GIS framework; prototype tension lysimeters have been designed and installed in soil pits to begin assessing the importance of DOC as a source of organic matter in deep soils; and many publications, listed in this document, have resulted from this year's research. Two of the papers published are included with this annual report document.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-199129 , NAS 1.26:199129
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Completing below-ground carbon budgets for pastures, recovering forests, and mature forests of Amazonia (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The objective of this grant was to complete below-ground carbon budgets for pastures and forest soils in the Amazon. Profiles of radon and carbon dioxide were used to estimate depth distribution of CO2 production in soil. This information is necessary for determining the importance of deep roots as sources of carbon inputs. Samples were collected for measuring root biomass from new research sites at Santana de Araguaia and Trombetas. Soil gases will be analyzed for CO2 and (14)CO2, and soil organic matter will be analyzed for C-14. Estimates of soil texture from the RADAMBRASIL database were merged with climate data to calculate soil water extraction by forest canopies during the dry season. In addition, a preliminary map of areas where deep roots are needed for deep soil water was produced. A list of manuscripts and papers prepared during the reporting periods is given.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-195959 , NAS 1.26:195959
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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