GOOD AFTERNOON TO ALL DAY ORDER III DATE

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GOOD AFTERNOON TO ALL DAY ORDER : III DATE: 13. 08. 2020 TIME :

GOOD AFTERNOON TO ALL DAY ORDER : III DATE: 13. 08. 2020 TIME : 2: 30 TO 3: 30 PAPER: BIO – GEOGRAPHY TOPIC: PLANT COMMUNITY – MEANING DEFINTION, VERTICAL LAYER OF PLANT COMMUNITY, Vertical stratification S. NITHYA LECTURER IN GEOGRAPHY GCWK(A)

MEANING: VEGETATION AND PLANT COMMUNITY The group or association of plants growing together in

MEANING: VEGETATION AND PLANT COMMUNITY The group or association of plants growing together in particular habitat is called plant community. In other words , ”those plants which grow together in particular habitat are referred to as a plant community, by which some thing more than a mere collection or assemblage is implies.

DEFINITION A Group of population of difference species living in the same local areas

DEFINITION A Group of population of difference species living in the same local areas and interacting with one an other is called “ecological community” B. D Botkin and E. A. Keller, 1982

VEGETATION The association or group of plant communities of any region is called Vegetation.

VEGETATION The association or group of plant communities of any region is called Vegetation. In other words “all the plants which grow together in any area from its vegetation, the character of which depends not just on the different species present but on the relative proportions in which their members are represented (J. TIVY, 1982)

Vertical stratification Stratification in the field of ecology refers to the vertical layering of

Vertical stratification Stratification in the field of ecology refers to the vertical layering of a habitat; the arrangement of vegetation in layers. It classifies the layers (sing. stratum, pl. strata) of vegetation largely according to the different heights to which their plants grow.

VERTICAL STRATIFICATION OF PLANT COMMUNITIES v Different species of plants are evolved in a

VERTICAL STRATIFICATION OF PLANT COMMUNITIES v Different species of plants are evolved in a habitat having favourable environment conditions wherein different species of plant community grow together having different life –forms. v The development of different species of plant community of a given region takes place through the process of Adaptation, competition , and natural selection.

On an average , there are four vertical strata of plant community in a

On an average , there are four vertical strata of plant community in a given region mainly in the deciduous forest of the temperate regions. v. DOMINANT LAYER v. SECONDARY LAYER v. THIRD LAYER v. FOURTH LAYER Dominant layer: The represents the topmost layer of the plant community which is the determined by the canopy of the largest trees. This uppermost stratum is also called crown or canopy which represents the highest limit of plant community in a given region.

Secondary layer: This is located below the dominant or crown layer and is represented

Secondary layer: This is located below the dominant or crown layer and is represented by plants of shrubby life – form. This is also called as shrub layer. Third layer: This layer is formed by the herbaceous plants and is also called as herb layer. Fourth layer: This layer represents mosses on the ground surface and is also called as mosses layer or ground layer.

THANKS TO ALL

THANKS TO ALL

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