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  • EARTH RESOURCES AND REMOTE SENSING  (3)
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  • EARTH RESOURCES AND REMOTE SENSING  (3)
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  • 1
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    Herbicide treatment effects on properties of mountain big sagebrush soils after fourteen years (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The effects of sagebrush conversion on the soil properties of a high-elevation portion of the Western Intermountain Sagebrush Steppe (West, 1983) are described. Changes were found in only a few soil chemical properties after conversion to grassland. It was found that surface concentrations of N were lower under grass vegetation than under undisturbed vegetation. Undershrub net N mineralization rates were higher under shrubs in the sagebrush vegetation than under former shrubs in the grass vegetation.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Soil Science Society of America, Journal (ISSN 0038-0776); 51; 1337-134
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Biochemical processes in sagebrush ecosystems: Interactions with terrain (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The objectives of a biogeochemical study of sagebrush ecosystems in Wyoming and their interactions with terrain are as follows: to describe the vegetational pattern on the landscape and elucidate controlling variables, to measure the soil properties and chemical cycling properties associated with the vegetation units, to associate soil properties with vegetation properties as measured on the ground, to develop remote sensing capabilities for vegetation and surface characteristics of the sagebrush landscape, to develop a system of sensing snow cover and indexing seasonal soil to moisture; and to develop relationships between temporal Thematic Mapper (TM) data and vegetation phenological state.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E86-10015 , NASA-TM-87508 , NAS 1.15:87508
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Estimating biogeochemical fluxes across sagebrush-steppe landscapes with Thematic Mapper imagery (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Thematic Mapper (TM) satellite data were coupled to an ecosystem simulation model to simulate variation in nitrogen mineralization over time and space in a sagebrush steppe. This system of data inputs and calculations provides estimates of ecosystem properties including rates of biogeochemical processes over extensive and complex landscapes, and under changing management and climatic conditions. The landscape surface was divided into three sagebrush ecosystem types plus one other class consisting of nonsagebrush vegetation. This classification presented a complex mosaic of ecosystem types that shifted markedly in composition from one end of the 933-sq km study area to the other. Annual N-mineralization rates ranged from 5 to 25 kg N/ha among the three sagebrush types. The most active type comprised 42 percent of the entire area but contributed 60 percent to the nitrogen mineralization throughout the landscape.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote Sensing of Environment (ISSN 0034-4257); 28; 121-129
    Format: text
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    NASA TECHNICAL REPORTS
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