primary production

(redirected from Gross Primary Productivity)
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primary production

the production by living organisms (AUTOTROPHS) of organic material from inorganic sources. Gross primary production is the total amount of organic material synthesized in a given time, whereas net primary production is the amount of organic material formed in excess of that used in respiration. Compare SECONDARY PRODUCTION.
References in periodicals archive ?
In this paper, we: 1) analyze the extreme ecosystem productivity anomaly of WS 15/16 at the regional scale and with site-level measurements, including a process interpretation, and 2) assess, based on an ensemble of process-oriented ecosystem model simulations, how the odds of extremely positive vegetation productivity events [measured in gross primary productivity (GPP) and net ecosystem productivity (NEP)] in winter and spring are changing in response to climate change.
Williams et al., "A model-data comparison of gross primary productivity: results from the North American carbon program site synthesis," Journal of Geophysical Research: Biogeosciences (2005-2012), vol.
Kobayashi et al., "Integration of MODIS land and atmosphere products with a coupled-process model to estimate gross primary productivity and evapotranspiration from 1 km to global scales," Global Biogeochemical Cycles, vol.
In the present work, the placement of underwater bottles in aquaria for periphyton development has caused a reduction in the abundance of phytoplankton as detected by the gross primary productivity results (Table 2).
Specifically, Gross Primary Productivity (GPP), Net Productivity (NP), Hourly Respiration Rate (HRR), and Respiration (R) were calculated for each day.
Gross primary productivity was greatest near the head of the estuary where freshwater input, and consequently nutrient input, was the strongest and decreased towards the mouth of the estuary, where tidal flushing reduces nutrient concentrations and hence productivity.
Gross primary productivity was measured by extrapolating from photosynthesis of individual leaves and by infrared analysis of C[O.sub.2] in an enclosed prism of forest.
This implies that when phytoplankton are responsible for the majority of light absorption and other factors are held constant, depth-integrated gross primary productivity should be constant in different depth ecosystems.