Environmental Heterogeneity Imposed by Photovoltaic Array Alters Grassland Soil Microbial Communities

Area of Science:

• Ecology
• Environmental Science
• Soil Science

Background:

• Photovoltaic (PV) energy expansion raises concerns about ecosystem impacts.
• PV arrays create unique microenvironments affecting aboveground processes.
• Belowground ecosystem consequences of PV development remain understudied.

Purpose of the Study:

• To assess plant-soil-microbial responses to PV system microsites.
• To investigate soil physiochemical, molecular, and functional changes under PV arrays.
• To compare microbial communities beneath PV systems with a reference grassland.

Main Methods:

• Paired soil physiochemical, molecular, and functional analyses.
• Aboveground productivity measures.
• Comparison across distinct PV microsites and a reference plot in a semi-arid grassland.

Main Results:

• Subtle changes in soil organic matter and pH correlated with aboveground productivity.
• Soil microbial community structure and function differed significantly across PV microsites.
• Microbial decomposition rates varied, being highest with high productivity but lowest with elevated soil moisture.

Conclusions:

• PV arrays induce distinct soil microbial community structures and functions.
• These microbial shifts can feedback to influence overall ecosystem functionality.
• Standard soil physiochemical measures may not capture the full impact of PV development on soil ecosystems.