Comparative characteristics of biogeocenoses and agrocenoses (fill in the table)
April 26, 2020
||Natural selection operates, rejecting non-viable individuals and preserving adaptations to environmental conditions, i.e., selection forms a sustainable ecosystem
||The action of natural selection is weakened by man; artificial selection is mainly carried out in the direction of preserving organisms with maximum productivity
|The nutrient cycle
||All elements consumed by plants, animals, and other organisms are returned to the soil, i.e., the cycle is carried out completely.
||Part of the nutrient elements is removed from the cycle with the mass of organisms grown and harvested as a crop, i.e., the cycle is not carried out
|Species diversity and sustainability
||They differ, as a rule, in a large species diversity of organisms that are in complex relationships with each other, providing stability
||The number of species is often limited to one, two; interconnections of organisms cannot provide sustainability.
|Ability to self-regulation, self-sustainability and turnover
||Self-regulating, constantly renewing, capable of directed replacement of one community by another (succession).
||Managed and controlled by humans through changes in natural factors (irrigation), weed and pest control, varietal change, and increased productivity.
|Productivity (amount of biomass generated per unit area)
||Sushi ecosystem biomass
exceeds the productivity of ecosystems of the oceans by 3 times; The main biomass products are consumed by consumers.
|Occupying 10% of the land area, annually produce 2.5 billion tons of agricultural products; are significantly more productive than biogeocenoses
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