Primary production - ecosystem, Biology

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.

Posted Date: 1/19/2013 1:30:07 AM | Location : United States







Related Discussions:- Primary production - ecosystem, Assignment Help, Ask Question on Primary production - ecosystem, Get Answer, Expert's Help, Primary production - ecosystem Discussions

Write discussion on Primary production - ecosystem
Your posts are moderated
Related Questions
Q. Nutritional Management for gastro oesophageal reflux disease? As mentioned above the nutrient requirements remain the same as per the RDI for most patients. It would be impo

Phenetic Classification This system is based exclusively upon face value of observed characters without direct reference to phylogeny. The taxa are either classified on the basi

Define about the Paper electrophoresis? In paper electrophoresis the sample is applied to a point on a strip of filter paper or cellulose acetate moistened with buffer solution

Describe the effects on the urinary system of drinking too much beer.

Two adaptation of the skin against attack by micro-organisms

Lack of Osseointegration (Indicated as Mobility)  Loss of osseointegration can occur during the early stages of treatment because of the inability of the woven bone to interfac

Formation of Aqueous  Humour It  is  universally accepted that the aqueous  is  produced  by  the  ciliary processes. Although a great deal of  research has been done on the fo

Which of the following results from the elimination of DNA helicase activity in a cell? A. The melting of the DNA double helix at the site of replication initiation will fail t

Define Supplementation for prevention of vitamin A deficiency? Administration of large doses of vitamin A to children at risk has been the most popular approach to control nutr