CONTACT US

084594-00000

About Us  :  Online Enquiry

Download

PRODUCTIVITY IN ECOLOGY

PRODUCTIVITY IN ECOLOGY

  • In ecology, productivity or production refers to the rate of generation of biomass in an ecosystem.
  • It is usually expressed in units of mass per unit area (or volume) per unit time, for instance, grams per square metre per day.
  • Productivity of autotrophs such as plants is called primary productivity, while that of heterotrophs such as animals is called secondary productivity.

Primary Production

  • Primary production is the synthesis of new organic material from inorganic molecules such as water and carbon dioxide.
  • It is dominated by the process of photosynthesis which uses sunlight to synthesise organic molecules such as sugars.
  • Organisms responsible for primary production include plants, algae and some bacteria (including cyanobacteria).

Gross Primary Production (GPP)

  • It is the amount of organic matter synthesised by producers per unit area in unit time.
  • In other words, it refers to the total production including the energy utilised for respiration by the producers. Mathematically,
  • GPP = Rate of increase in body weight or rate of organic matter synthesised by producers + the rate of respiration (R) and other utilisation of mass by primary producers.

Net Primary Production (NPP)

  • It is the amount of organic matter stored by producers per unit area in unit time.          PRODUCTIVITY IN ECOLOGY
  • In other words, it refers to the net productivity that is converted to organic matter excluding the energy utilised for respiration and other purposes by the producers.

Mathematically,

NPP = Rate of organic matter synthesised by photosynthesis by producers  – the rate of energy utilised for respiration and other purposes.

Secondary Production

  • Secondary production is the generation of biomass by heterotrophic (consumer) organisms in a system.
  • This is driven by the transfer of organic materials between trophic levels, and represents the quantity of new tissue created through the use of assimilated food.
  • Organisms responsible for secondary production include animals, protists, fungi and many bacteria.        PRODUCTIVITY IN ECOLOGY
  • Compounds that are considered organic must contain carbon bound to hydrogen, and possibly, other elements. By this definition, carbon dioxide is inorganic in nature.

ALSO READ : https://www.brainyias.com/organic-farming-in-india/

Environment & Biodiversity

close-link

Send this to a friend