# how is primary productivity measured

A quick overview of GPP, NPP and what constitutes primary productivity and the light bottle/dark bottle method. *Measurement of primary productivity in aquatic system measurement are two types:- 1. Productivity is usually measured as the rate at which energy or biomass is produced per unit area per unit time. Productivity stands for the total increase in the mass (phytomass). It is based upon the assumption that the amount of oxygen produced is proportional to gross production because one molecule of oxygen is produced for each atom of carbon fixed. Measurement of primary productivity 1. What does primary productivity measure? Primary goods: Primary goods are any goods that are farmed foods and raised animals. * MEASUREMENT OF PRIMARY PRODUCTIVITY:- AQUATIC ECOSYSTEM Presented to: Presented by: Dr. S.SUNDARAMOORTHY Narpat Singh Prof. Msc. Learning Objectives Explain the concept of primary production and distinguish between gross primary production and net primary production One bottle is stored in the dark and the other in a lighted area. This method is employed to measure primary productivity in an aquatic ecosystem such as a pond. Whether one measures the rate at which photosynthesis occurs, or the rate at which the individual plant increases in mass, one is concerned with primary production (definition: the synthesis and storage of organic molecules during the growth and reproduction of photosynthetic organisms). In this method, a sample of water is placed into two bottles. Samples of water from different depths are placed in paired bottles. The more they produce, the more they contribute to profits for the company. At its simplest, labour productivity is the amount of output per worker. The productivity of a factory worker making footballs, for example, could be measured by how many footballs they make in one hour. Main Difference. • Measures gross and net primary production • Relatively “easy” to measure Several caveats: • 1) assumes rate of respiration in dark = light. Daniel G. Milchunas, Biases and Errors Associated with Different Root Production Methods and Their Effects on Field Estimates of Belowground Net Primary Production, Measuring Roots, 10.1007/978-3-642-22067-8, (303-339), (2012). Only respiration can occur in the bottle stored in the dark. Various light dependent oxygen consuming pathways (Mehler reaction and photorespiration) • 2) requires incubation and confinement of samples. primary productivity OVERVIEW: Primary production is estimated from 14 C uptake using a simulated in situ technique in which the assimilation of dissolved inorganic carbon by phytoplankton yields a measure of the rate of photosynthetic primary production in the euphotic zone. 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