Direct root contact among neighboring plants influences activity of soil extracellular enzymes

Lee, Jin Ho; Kim, Kyungmin; Guber, Andrey K.; Oerther, Maxwell; Kuzyakov, Yakov; Kravchenko, Alexandra N.

doi:10.1016/j.apsoil.2025.106422

Direct root contact among neighboring plants influences activity of soil extracellular enzymes

Journal Article · Mon Sep 01 00:00:00 EDT 2025 · Applied Soil Ecology

DOI:https://doi.org/10.1016/j.apsoil.2025.106422· OSTI ID:2588035

Lee, Jin Ho ^[1]; Kim, Kyungmin ^[2]; Guber, Andrey K. ^[1]; Oerther, Maxwell ^[1]; Kuzyakov, Yakov ^[3]; Kravchenko, Alexandra N. ^[1]

Michigan State University, East Lansing, MI (United States)
Michigan State University, East Lansing, MI (United States); Seoul National University (Korea, Republic of)
University of Goettingen (Germany); Peoples Friendship University of Russia (RUDN University), Moscow (Russia)

Composition and diversity of vegetation systems can influence soil microbial activity and extracellular enzyme (EE) dynamics, which are crucial for soil carbon (C) accrual and nutrient cycling. Yet, the impact of plant interactions and competition on EE activities remains a notable knowledge gap. This study examines how direct root contact and neighboring plant identity affect the activity and spatial distribution of four key soil EEs: β-glucosidase (BGlu), chitinase, acid phosphatase (AcidP), and alkaline phosphatase (AlkP). Using three-compartment rhizoboxes with switchgrass (Panicum virgatum L.) grown alongside bush clover (Lespedeza capitata Michx.), and black-eyed Susan (Rudbeckia hirta L.), we assessed enzyme activities using zymography under conditions that either allowed or restricted direct root contact by root barriers. Results show that root proliferation and species interactions significantly influenced EE activity. While BGlu and AcidP activities were strongly correlated with root biomass, AlkP activity was consistently higher in the absence of root barriers, indicating a pronounced microbial response to plant interactions via direct/close root contacts. Additionally, soil phosphorus availability modulated enzyme activity, with higher phosphatase activities in low-P soils. Furthermore, these findings highlight the importance of root-root interactions and plant species composition in shaping soil biochemical processes.

View Accepted Manuscript (DOE)

Research Organization:: Great Lakes Bioenergy Research Center (GLBRC), East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0018409

OSTI ID:: 2588035

Journal Information:: Applied Soil Ecology, Journal Name: Applied Soil Ecology Vol. 215; ISSN 0929-1393

Publisher:: Elsevier BVCopyright Statement

Country of Publication:: United States

Language:: English

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