Saturday, 13 August 2016

Viki Sangre

Contribution of Semi-arid Ecosystems Area, Climate, Region in Ecology | Arthor George Tansley (1891-1955)

Arid and semi-arid ecosystems involve the study of living things and their relationship with their environment i.e climate, region (land like desert) rather than just looking at individual types of plants and animals.

The living things (biotic) are the green plants, animals, bacteria fungi etc and their environment (abiotic) constitutes the earth, air, water, minerals and compounds such as Carbon, Nitrogen, Oxygen, Carbon dioxide and others, both influencing each other which is necessary to maintain life.

The composition of biotic and abiotic phases are the building blocks of an arid ecosystem area.


Professor Arthor George Tansley (1891-1955) a renowned British ecologist first proposed the term 'ecosystem' in the year 1935 and defined it as the “System resulting from the integration of all living and non-living factors of the environment”. His contribution is great in a semi-arid ecosystem.

Ecosystems are self-contained interacting systems, where there is an input of energy (solar) and materials (organic and inorganic) through death, decay and weathering by water and the wind, recycling of materials and their exchange within the system, initiating a flow of energy through the living organisms. In an ecosystem, the process of material exchange leads to outputs such as surface runoff, water vapor, carbon dioxide, heat, leaching and human activities (harvesting).

Interaction within the living organisms and between the living and non-living components in a semi-arid area has been regarded as an extremely valuable facet of relationship making the ecosystem a basic unit of ecological study.

Every ecosystem must have a STRUCTURE and a FUNCTION. The structure of an ecosystem has 2 components, Abiotic components energy, materials (inorganic, organic compound) climate, soil. Biotic components-Producers (green plants autotrophs) Consumers (animals heterotrophs) and Decomposers (microbes-bacteria, fungi, insects).

The Function of a semi-arid ecosystem region denotes the energy flow among the living organisms; their rate and pattern.