Effects of soil type and farm management on soil ecological functional genes and microbial activities

Jennifer R. Reeve, Christopher W. Schadt, Lynne Carpenter-Boggs, Sanghoon Kang, Jizhong Zhou, John P. Reganold

Research output: Contribution to journalArticlepeer-review

112 Scopus citations

Abstract

Relationships between soil microbial diversity and soil function are the subject of much debate. Process-level analyses have shown that microbial function varies with soil type and responds to soil management. However, such measurements cannot determine the role of community structure and diversity in soil function. The goal of this study was to investigate the role of gene frequency and diversity, measured by microarray analysis, on soil processes. The study was conducted in an agro-ecosystem characterized by contrasting management practices and soil types. Eight pairs of adjacent commercial organic and conventional strawberry fields were matched for soil type, strawberry variety, and all other environmental conditions. Soil physical, chemical and biological analyses were conducted including functional gene microarrays (FGA). Soil physical and chemical characteristics were primarily determined by soil textural type (coarse vs fine-textured), but biological and FGA measures were more influenced by management (organic vs conventional). Organically managed soils consistently showed greater functional activity as well as FGA signal intensity (SI) and diversity. Overall FGA SI and diversity were correlated to total soil microbial biomass. Functional gene group SI and/or diversity were correlated to related soil chemical and biological measures such as microbial biomass, cellulose, dehydrogenase, ammonium and sulfur. Management was the dominant determinant of soil biology as measured by microbial gene frequency and diversity, which paralleled measured microbial processes.

Original languageEnglish
Pages (from-to)1099-1107
Number of pages9
JournalISME Journal
Volume4
Issue number9
DOIs
StatePublished - Sep 2010

Funding

This work was funded by The Organic Center (http:// www.organic-center.org). Microarray analysis and the participation of Dr’s Schadt and Zhou was supported by The United States Department of Energy under the Environmental Remediation Science Program, and Genomics: GTL program through the Virtual Institute of Microbial Stress and Survival (VIMSS; http://vimss.lbl.gov), Office of Biological and Environmental Research, Office of Science, and by the United States Department of Agriculture through NSF-USDA Microbial Observatories Program. We thank Tom Sjulin of Driscoll’s Strawberry Associates and Larry Eddings of Pacific Gold Farms for assistance with farm selection. A special thanks to Drs Jan Dasgupta and Stuart Higgins for help and advice on statistical analysis. Additional thanks to Debbi Bikfasy, Margaret Davies, Mary Fauci and Emily Hollister for training and advice in lab protocols.

Keywords

  • GeoChip microarray
  • organic farming
  • soil functions

Fingerprint

Dive into the research topics of 'Effects of soil type and farm management on soil ecological functional genes and microbial activities'. Together they form a unique fingerprint.

Cite this