Which of the following cycle would by affected if decomposers of an ecosystem vanish?

Biogeochemical cycle would be affected if decomposers of an ecosystem vanish.
A biogeochemical cycle is a pathway by which a chemical substance cycles the biotic and abiotic compartments of Earth. The biotic compartment is the biosphere and the abiotic compartments are the atmosphere, hydrosphere and lithosphere.
The fast cycle includes annual cycles involving photosynthesis and decadal cycles involving vegetative growth and decomposition.