An ecosystem is a natural unit in which biotic communities and abiotic environments interact with each other.
The biotic and abiotic communities are included in the maintenance of the ecosystem.
The biotic communities include:
Producers
Consumers
Decomposers
The abiotic communities include:
Temperature
Light
Gravity
Topography etc….

MAJOR ECOSYSTEM OF WORLD
The major ecosystem of the world are:
Marine Ecosystem
Estuarine ecosystem
Freshwater Ecosystem
Wetland Ecosystem
Tundra Ecosystem
Forest Ecosystem
Grassland Ecosystem
Desert & Agriculture Ecosystem
Here I will explain only the Desert & Agriculture ecosystem…

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