Spatial variation in soil microbial processes as a result of woody encroachment depends on shrub size in tallgrass prairie

Connell, R. Kent; O’Connor, Rory C.; Nippert, Jesse B.; Blair, John M.

doi:10.1007/s11104-020-04813-9

Spatial variation in soil microbial processes as a result of woody encroachment depends on shrub size in tallgrass prairie

Journal Article · Tue Jan 12 00:00:00 EST 2021 · Plant and Soil

DOI:https://doi.org/10.1007/s11104-020-04813-9· OSTI ID:1865314

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Kansas State Univ., Manhattan, KS (United States); Univ. of Michigan, Ann Arbor, MI (United States); Kansas State University
Kansas State Univ., Manhattan, KS (United States); USDA-ARS Eastern Oregon Agricultural Research Center, Burns, OR (United States)
Kansas State Univ., Manhattan, KS (United States)

Aims: As woody plants encroach into grassland ecosystems, we expect that altered plant-soil interactions will lead to changes in the microbial processes that affect carbon storage and nutrient cycling. Specifically, this research aimed to address how (1) soil chemistry, (2) microbial nutrient demand, and (3) the rate and source of potential soil C mineralization vary spatially under individual woody shrubs of varying size within a mesic grassland. Methods: Here, we collected soil samples from the center, the midpoint between the center and edge, the edge, and the shrub-grass ecotone of multiple Cornus drummondii shrubs across a shrub-size gradient in infrequently burned tallgrass prairie. Results: We found total soil carbon and total soil nitrogen increased with shrub size in every location but the edge. Microbial demand for nitrogen also increased as shrubs increased in size. Across all shrub sizes and sampling locations, potential soil carbon mineralization rates were higher when microbes broke down proportionally more shrub-derived (C₃) organic matter than grass-derived (C₄) organic matter. Conclusions: Our results suggest that the spatio-temporal context of woody encroachment is critical for understanding its impact on belowground microbial processes. In this ecosystem, a longer period of occupancy by woody plants increases potentially mineralizable carbon.

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Research Organization:: Kansas State Univ., Manhattan, KS (United States)

Sponsoring Organization:: National Science Foundation; USDOE

Grant/Contract Number:: SC0019037

OSTI ID:: 1865314

Alternate ID(s):: OSTI ID: 1852773

Journal Information:: Plant and Soil, Journal Name: Plant and Soil Journal Issue: 1-2 Vol. 460; ISSN 0032-079X

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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