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What are the three ways that primary productivity can be measured?

GPP, gross primary production, is the technical term for plant photosynthesis.

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/ / / / Photosynthesis and Primary Productivity

The of a is the amount of biomass produced through photosynthesis per unit area and time by plants, the primary producers. Primary productivity is usually expressed in units of energy (e.g., joules m day ) or in units of dry organic matter (e.g., kg m year ). Globally, primary production amounts to 243 billion metric tons of dry plant biomass per year. The total energy by plants in a community through photosynthesis is referred to as (). Because all the energy fixed by the plant is converted into sugar, it is theoretically possible to determine a plant's energy uptake by measuring the amount of sugar produced. A proportion of the energy of gross primary productivity is used by plants in a process called . Respiration provides a plant with the energy needed for various plant physiological and morphological activities. The general equation for respiration is:

Gross productivity: the entire photosynthetic production of organic compounds in an ecosystem.c.

How does subtracting the two enable us to indirectly measure net productivity?

To indirectly measure net productivity is photosynthesis minus respiration.


Students determine the primary productivity of an aquatic plant.

At what depth—shallow or deep—will there be more primary productivity in a pond or a lake?

Okay, so I know that net primary production (NPP) is the difference between gross primary production (from photosynthesis) minus Autotrophic respiration (Ra):

Primary production of a waterbody is the rate of conversion of solar energy to chemical energy (organic compounds) by green plants. We usually distinguish between gross primary production and net primary production. Gross primary production is the rate of all photosynthetic processes regardless of the fate of the compounds which are produced during photosynthesis. Part of the photosynthate is diverted to growth (i.e., increase in biomass) and part is reconverted to C02 and water in the process of respiration, which provides the energy to run the metabolic machinery of the cells. Net production is the total amount of photosynthesis which is diverted toward growth, and is thus always less than gross production. The relationship between gross production, net production and respiration is as follows:

9(l) Primary Productivity of Plants - Physical geography

When the water in the pond was around 25 meters, the primary productivity rate stayed constant.

The productivity of macrophytes in streams and rivers is limited by a variety of interacting factors. The depth of light penetration, current, the availability of suitable substrate, nutrient availability, hardness, temperature, and forest canopy cover all combine to influence macrophyte growth in lotic systems. Among these factors light and current may be considered pivotal factors in presence (and abundance) or absence of macrophytes at a particular site. Well developed forest canopies and high turbidity levels often serve to greatly limit the presence of macrophytes in steams and rivers due to light limitation.

Wetland primary production is a measure of ecosystem metabolism. It quantifies the amount of carbon fixed in the process of photosynthesis and released in the process of respiration by the plants and algae (photosynthetic organisms) in the ecosystem. At the ecosystem level, the total amount of carbon captured and stored via photosynthesis is known as gross primary production , or GPP. Respiration is the cellular process in which the chemical energy contained in organic compounds is converted to useful energy (in the form of adenosine triphosphate, ATP) to maintain cellular activity. The balance of these two processes represents the net carbon fixed into organic compounds, or net primary production (NPP), which can be used to build biomass.

Use a dissolved oxygen sensor to determine the primary productivity of an aquatic plant.
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  • LabBench Activity Primary Productivity

    All LAADS Gross Primary Production & Net Primary Productivity data products are accessible via the .

  • Photosynthesis and Primary Productivity Lab: PASCO

    mango).For the net productivity one, I basically explain the overall relationship displayed on the graph.

  • it is possible to calculate gross primary productivity using ..

    Southampton CARbon Flux (SCARF) model) for estimating daily gross primary productivity (GPP).

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net, and gross primary productivity ..

When the depth of the water reached around 30 and up, there was no primary productivity

Explain the data presented by the graph, including a description of the relative rates of metabolic processes occurring at different depths of the pond


Measuring Gross Primary Productivity (GPP) using Light …

By subtracting the initial amount of oxygen from the final amount of oxygen,then the net productivity would be found. To determine the gross amount of productivity, you need to find the amount of carbon used over the 24-hour period and the amount of oxygen that got produce in that time period, then add those numbers together

c. In an experiment, net primary productivity was measured, in the early spring, for water samples taken from different depths of a freshwater pond in a temperate deciduous forest.
The data presented by this graph shows that the lower the depth of the water, the less primary production is occurring.

Measuring Gross Primary Productivity ..

Consumers in aquatic ecosystems depend on producers for nutrition.

a. Explain the difference between gross and net primary productivity.
Gross productivity is amount of oxygen use for photosynthesis. Net productivity is amount of oxygen used in respiration and released in photosynthesis

b. Describe a method to determine net and gross primary productivity in a freshwater pond over a 24-hour period

To determine the net productivity in a freshwater pond over a 24-hour period, first record the initial amount of oxygen in the pond, then after 24-hours, record the amount of oxygen.

(total photosynthesis) is gross primary ..

Shallow water will have more primary productivity, because there is plenty of sunlight in shallow water, and in deep water, there will be less light for organisms to go through photosynthesis


Gross primary productivity - Revolvy

Describe how the relationship between net primary productivity and depth would be expected to differ if new data were collected in mid-summer from the same pond. Explain your prediction.
The relationship of primary productivity and depth would be that, lower depth will have at least no increase or decrease of productivity. With more light shining, there is more of a chance for sunlight to get deeper into ocean, than in Spring, because sun in spring isn't at it's highest point, therefore having less of a chance for sunlight to get deeper into waters

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