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.
There were temporal fluctuations of primary production (Table 4), the highest values of gross primary productivity (GPP) rates were recorded in dry weather conditions in both lakes, while the lowest values were during mix weather conditions in both lakes, and net primary productivity.
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).
2] or 52% of the aquarium's surface area) were put into each aquaria intended to develop periphyton; (4) Gross primary productivity was calculated by the light and dark bottle method after 3 h of water incubation (BOYD, 1979); (5) For a same variable, means not sharing a same lower case or capital letter in a row and column, respectively, are significantly different between themselves by the Tukey's test (P < 0.
Gross Primary Productivity is an indication of system metabolism and is a measure of total photosynthesis.
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.