Zonal Soil Type Determines Soil Microbial Responses to Maize Cropping and Fertilization

Area of Science:

• Soil science
• Microbiology
• Ecology

Background:

• Soil types are crucial for ecological dynamics, but their role in microbial responses to land management is debated.
• Previous studies lacked in-depth comparisons across diverse soil types.

Purpose of the Study:

• To investigate how different soil types influence microbial community structure and function under land management changes.
• To assess the impact of maize cropping and fertilization on microbial communities across various soil types.

Main Methods:

• Collected soil samples from three major zonal soil types.
• Analyzed bacterial and fungal community structures using Illumina sequencing.
• Examined microbial functional genes with GeoChip and microbial biomass via fatty acid analysis.
• Measured soil nitrification potential and CO2 efflux.

Main Results:

• Distinct soil types exhibited unique microbial biomass and community compositions.
• Five years of maize cropping altered bacterial communities in Ultisols and fungal communities in Mollisols.
• Fertilization-induced soil acidification affected microbial communities in Mollisols and Ultisols, correlating with soil pH.
• Microbial community shifts correlated with changes in soil nitrification and respiration processes.

Conclusions:

• Soil type is a critical determinant of microbial community responses to land management.
• Generalizing ecosystem responses across landscapes is challenging without accounting for soil type.
• Future assessments of microbial feedback must integrate soil type considerations.