Primary production - ecosystem, Biology

Assignment Help:

Primary Production - Ecosystem

Energy accumulated by plants during photosynthesis is called production or more specifically primary production. It is the first and the basic form of energy stored in an ecosystem. Production is defined technically as the amount of biomass or organic matter produced per unit &ea in a given period. It can be expressed in terms of 2 weight (g/m2) or energy {kcal/m).

The rate at which energy accumulates is  known as primary productivity. It is expressed in terms of kcal/m /yr or g/m2/yr. In case of plants, primary production is generally differentiated into two distinct categories, namely gross primary production (GPP) and net primary production (NPP). Gross primary production refers to the total amount of solar energy fixed into organic matter by primary producers through photosynthesis. A considerable portion of the solar energy fixed by plants (GPPI. is utilised by plants themselves in respiration (R) to get the energy needed for their metabolism and for other vital functions. The amount of energy left after respiratory consumption (R) is incorporated into new body tissue (growth) or is used for producing new individuals (reproduction). The amount of biomass or organic matter accumulated by plants per unit area in a given period is called net primary production. The overall relationship between GPP and NPP can be written as:

GPP - R = NPP or GPP = NPP + R

From this equation you might have noticed  that whatever  energy is fixed by plants (GPP) some of  it  is used  for their own maintenance  (R) and only remaining  (NPP) is  available for the next trophic  level.  So net primary production is the only energy available for the next trophic level.


Related Discussions:- Primary production - ecosystem

Are sex-linked diseases associated to genes of x chromosome, Are sex-linked...

Are sex-linked diseases associated only to genes of the X chromosome? There are so many X-linked diseases such like, hemophilia B, hemophilia A and adrenoleukodystrophy, but re

Developmental biology, a sea urchin egg is injected with an mRNA encoding t...

a sea urchin egg is injected with an mRNA encoding the cadherin protein fragment described above and an mRNA encoding the Pmar1 transcription factor. The embryo is allowed to devel

Explain congenital syphilis, Congenital Syphilis  A positive serologica...

Congenital Syphilis  A positive serological test for syphilis in a newborn without stigmata of syphilis may be due either to passive transfer of maternal antibodies or to prena

The iodine test, why is it necessary to grind food before the testng?

why is it necessary to grind food before the testng?

Explain chilling temperatures - method of food preservation, Explain chilli...

Explain chilling temperatures - method of food Preservation? (a) Cellar storage temperatures (about 15° C): It is usually used for the storage of surplus foods like root crops,

Explain the alterations occurring in egg, Alterations occurring in egg ...

Alterations occurring in egg The quality, flavour, composition and functional properties of eggs are adversely affected more rapidly and to a greater extent by the speed and co

Define the plasma membrane and its function, Similar to all animal cells, p...

Similar to all animal cells, protozoans are covered by a plasma membrane which surrounds cytoplasm of the cell, protozoan's integument or skin. Like all membranes, it's permeable;

What do you mean by uricotelic and ureotelic excretions, Q Comparing toxici...

Q Comparing toxicity and the need for dilution in water how different are the uricotelic and ureotelic excretions? What are some examples of animals that present these respective t

Dideoxy sequencing, Dideoxy Sequencing is the enzymatic determination and ...

Dideoxy Sequencing is the enzymatic determination and consideration of DNA or RNA sequence by the rechnique of Sanger and colleagues, based on incorporation of the chain terminati

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd