Estimating Net Primary Productivity Using Satellite and Ancillary Data
The net primary productivity (C) or the annual rate of carbon accumulation per unit ground area by terrestrial plant communities is the difference of gross photosynthesis (A(sub g)) and respiration (R) per unit ground area. Available field observations show that R is a large and variable fraction of...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20030020949 2023-05-15T17:48:48+02:00 Estimating Net Primary Productivity Using Satellite and Ancillary Data Choudhury, Bhaskar J. Unclassified, Unlimited, Publicly available January 2002 application/pdf http://hdl.handle.net/2060/20030020949 unknown Document ID: 20030020949 http://hdl.handle.net/2060/20030020949 No Copyright CASI Earth Resources and Remote Sensing IAC-02-B.4.06 The World Space Congress - 2002; 10-19 Oct. 2002; Houston, TX; United States|53rd International Astronautical Congress; 10-19 Oct. 2002; Houston, TX; United States 2002 ftnasantrs 2019-07-21T02:28:37Z The net primary productivity (C) or the annual rate of carbon accumulation per unit ground area by terrestrial plant communities is the difference of gross photosynthesis (A(sub g)) and respiration (R) per unit ground area. Available field observations show that R is a large and variable fraction of A(sub g), although it is generally recognized that there are considerable difficulties in determining these fluxes, and thus pose challenge in assessing the accuracy. Further uncertainties arise in extrapolating field measurements (which are acquired over a hectare or so area) to regional scale. Here, an approach is presented for determining these fluxes using satellite and ancillary data to be representative of regional scale and allow assessment of interannual variation. A, has been expressed as the product of radiation use efficiency for gross photosynthesis by an unstressed canopy and intercepted photosynthetically active radiation, which is then adjusted for stresses due to soil water shortage and temperature away from optimum. R has been calculated as the sum of growth and maintenance components (respectively, R(sub g) and R(sub m)).The R(sub m) has been determined from nitrogen content of plant tissue per unit ground area, while R(sub g) has been obtained as a fraction of the difference of A(sub g) and R(sub m). Results for five consecutive years (1986-1990) are presented for the Amazon-Tocontins, Mississippi, and Ob River basins. Other/Unknown Material ob river NASA Technical Reports Server (NTRS) |
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NASA Technical Reports Server (NTRS) |
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Earth Resources and Remote Sensing |
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Earth Resources and Remote Sensing Choudhury, Bhaskar J. Estimating Net Primary Productivity Using Satellite and Ancillary Data |
topic_facet |
Earth Resources and Remote Sensing |
description |
The net primary productivity (C) or the annual rate of carbon accumulation per unit ground area by terrestrial plant communities is the difference of gross photosynthesis (A(sub g)) and respiration (R) per unit ground area. Available field observations show that R is a large and variable fraction of A(sub g), although it is generally recognized that there are considerable difficulties in determining these fluxes, and thus pose challenge in assessing the accuracy. Further uncertainties arise in extrapolating field measurements (which are acquired over a hectare or so area) to regional scale. Here, an approach is presented for determining these fluxes using satellite and ancillary data to be representative of regional scale and allow assessment of interannual variation. A, has been expressed as the product of radiation use efficiency for gross photosynthesis by an unstressed canopy and intercepted photosynthetically active radiation, which is then adjusted for stresses due to soil water shortage and temperature away from optimum. R has been calculated as the sum of growth and maintenance components (respectively, R(sub g) and R(sub m)).The R(sub m) has been determined from nitrogen content of plant tissue per unit ground area, while R(sub g) has been obtained as a fraction of the difference of A(sub g) and R(sub m). Results for five consecutive years (1986-1990) are presented for the Amazon-Tocontins, Mississippi, and Ob River basins. |
format |
Other/Unknown Material |
author |
Choudhury, Bhaskar J. |
author_facet |
Choudhury, Bhaskar J. |
author_sort |
Choudhury, Bhaskar J. |
title |
Estimating Net Primary Productivity Using Satellite and Ancillary Data |
title_short |
Estimating Net Primary Productivity Using Satellite and Ancillary Data |
title_full |
Estimating Net Primary Productivity Using Satellite and Ancillary Data |
title_fullStr |
Estimating Net Primary Productivity Using Satellite and Ancillary Data |
title_full_unstemmed |
Estimating Net Primary Productivity Using Satellite and Ancillary Data |
title_sort |
estimating net primary productivity using satellite and ancillary data |
publishDate |
2002 |
url |
http://hdl.handle.net/2060/20030020949 |
op_coverage |
Unclassified, Unlimited, Publicly available |
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ob river |
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ob river |
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CASI |
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Document ID: 20030020949 http://hdl.handle.net/2060/20030020949 |
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No Copyright |
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1766154953390292992 |