Global cropland monthly gross primary production in the year 2000
Croplands cover about 12% of the ice-free terrestrial land surface. Compared with natural ecosystems, croplands have distinct characteristics due to anthropogenic influences. Their global gross primary production (GPP) is not well constrained and estimates vary between 8.2 and 14.2 Pg C yr<sup>...
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doaj-b8a0abf72ba94d08a796bcf3f14c21f42020-11-24T23:31:57ZengCopernicus PublicationsBiogeosciences1726-41701726-41892014-07-0111143871388010.5194/bg-11-3871-2014Global cropland monthly gross primary production in the year 2000T. Chen0G. R. van der Werf1N. Gobron2E. J. Moors3A. J. Dolman4Department of Earth Sciences, Faculty of Earth and Life Sciences, VU University Amsterdam, the NetherlandsDepartment of Earth Sciences, Faculty of Earth and Life Sciences, VU University Amsterdam, the NetherlandsClimate Risk Management Unit, Institute for Environment and Sustainability, European Commission Joint Research Center, Ispra, ItalyEarth System Science and Climate Change Group, Wageningen University and Research Centre, Wageningen, the NetherlandsDepartment of Earth Sciences, Faculty of Earth and Life Sciences, VU University Amsterdam, the NetherlandsCroplands cover about 12% of the ice-free terrestrial land surface. Compared with natural ecosystems, croplands have distinct characteristics due to anthropogenic influences. Their global gross primary production (GPP) is not well constrained and estimates vary between 8.2 and 14.2 Pg C yr<sup>−1</sup>. We quantified global cropland GPP using a light use efficiency (LUE) model, employing satellite observations and survey data of crop types and distribution. A novel step in our analysis was to assign a maximum light use efficiency estimate (ϵ<sup>*</sup><sub>GPP</sub>) to each of the 26 different crop types, instead of taking a uniform value as done in the past. These ϵ<sup>*</sup><sub>GPP</sub> values were calculated based on flux tower CO<sub>2</sub> exchange measurements and a literature survey of field studies, and ranged from 1.20 to 2.96 g C MJ<sup>−1</sup>. Global cropland GPP was estimated to be 11.05 Pg C yr<sup>−1</sup> in the year 2000. Maize contributed most to this (1.55 Pg C yr<sup>−1</sup>), and the continent of Asia contributed most with 38.9% of global cropland GPP. In the continental United States, annual cropland GPP (1.28 Pg C yr<sup>−1</sup>) was close to values reported previously (1.24 Pg C yr<sup>−1</sup>) constrained by harvest records, but our estimates of ϵ<sup>*</sup><sub>GPP</sub> values were considerably higher. Our results are sensitive to satellite information and survey data on crop type and extent, but provide a consistent and data-driven approach to generate a look-up table of ϵ<sup>*</sup><sub>GPP</sub> for the 26 crop types for potential use in other vegetation models.http://www.biogeosciences.net/11/3871/2014/bg-11-3871-2014.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
T. Chen G. R. van der Werf N. Gobron E. J. Moors A. J. Dolman |
spellingShingle |
T. Chen G. R. van der Werf N. Gobron E. J. Moors A. J. Dolman Global cropland monthly gross primary production in the year 2000 Biogeosciences |
author_facet |
T. Chen G. R. van der Werf N. Gobron E. J. Moors A. J. Dolman |
author_sort |
T. Chen |
title |
Global cropland monthly gross primary production in the year 2000 |
title_short |
Global cropland monthly gross primary production in the year 2000 |
title_full |
Global cropland monthly gross primary production in the year 2000 |
title_fullStr |
Global cropland monthly gross primary production in the year 2000 |
title_full_unstemmed |
Global cropland monthly gross primary production in the year 2000 |
title_sort |
global cropland monthly gross primary production in the year 2000 |
publisher |
Copernicus Publications |
series |
Biogeosciences |
issn |
1726-4170 1726-4189 |
publishDate |
2014-07-01 |
description |
Croplands cover about 12% of the ice-free terrestrial land surface.
Compared with natural ecosystems, croplands have distinct characteristics due
to anthropogenic influences. Their global gross primary production (GPP) is
not well constrained and estimates vary between 8.2 and
14.2 Pg C yr<sup>−1</sup>. We quantified global cropland GPP using a light use
efficiency (LUE) model, employing satellite observations and survey data of
crop types and distribution. A novel step in our analysis was to assign a
maximum light use efficiency estimate (ϵ<sup>*</sup><sub>GPP</sub>) to
each of the 26 different crop types, instead of taking a uniform value as
done in the past. These ϵ<sup>*</sup><sub>GPP</sub> values were
calculated based on flux tower CO<sub>2</sub> exchange measurements and a
literature survey of field studies, and ranged from 1.20 to
2.96 g C MJ<sup>−1</sup>. Global cropland GPP was estimated to be
11.05 Pg C yr<sup>−1</sup> in the year 2000. Maize contributed most to this
(1.55 Pg C yr<sup>−1</sup>), and the continent of Asia contributed most with
38.9% of global cropland GPP. In the continental United States, annual
cropland GPP (1.28 Pg C yr<sup>−1</sup>) was close to values reported previously
(1.24 Pg C yr<sup>−1</sup>) constrained by harvest records, but our estimates of
ϵ<sup>*</sup><sub>GPP</sub> values were considerably higher. Our
results are sensitive to satellite information and survey data on crop type
and extent, but provide a consistent and data-driven approach to generate a
look-up table of ϵ<sup>*</sup><sub>GPP</sub> for the 26 crop types for
potential use in other vegetation models. |
url |
http://www.biogeosciences.net/11/3871/2014/bg-11-3871-2014.pdf |
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