If you applied a fungicide to a cornfield, what would you expect to happen to the rate of decomposition and net ecosystem production (NEP)? a. Both decomposition rate and NEP would decrease. b. Neither would change. c. Decomposition rate would increase and NEP would decrease. d. Decomposition rate would decrease and NEP would increase.

Key Concepts

Fungicide Effects

Fungicides are chemicals used to kill or inhibit the growth of fungi. When applied to crops like corn, they can disrupt the natural microbial communities in the soil, which play a crucial role in decomposition. This disruption can lead to a decrease in the rate of decomposition as beneficial fungi that break down organic matter are affected.

Decomposition Rate

Decomposition is the process by which organic matter is broken down into simpler substances by microorganisms, including bacteria and fungi. A higher decomposition rate typically leads to the release of nutrients back into the soil, which supports plant growth. If fungicides reduce the activity of decomposers, the rate of decomposition may decline, affecting nutrient cycling.

Net Ecosystem Production (NEP)

Net Ecosystem Production (NEP) is the difference between the total carbon absorbed by photosynthesis and the total carbon released by respiration in an ecosystem. If decomposition slows down due to fungicide application, the availability of nutrients for plants may decrease, potentially leading to lower plant growth and reduced NEP. Thus, changes in decomposition can directly impact NEP.