Interactions among plants, bacteria, and fungi reduce extracellular enzyme activities under long-term N fertilization

Global Change Biology
Joseph E CarraraEdward R Brzostek

Abstract

Atmospheric nitrogen (N) deposition has enhanced soil carbon (C) stocks in temperate forests. Most research has posited that these soil C gains are driven primarily by shifts in fungal community composition with elevated N leading to declines in lignin degrading Basidiomycetes. Recent research, however, suggests that plants and soil microbes are dynamically intertwined, whereby plants send C subsidies to rhizosphere microbes to enhance enzyme production and the mobilization of N. Thus, under elevated N, trees may reduce belowground C allocation leading to cascading impacts on the ability of microbes to degrade soil organic matter through a shift in microbial species and/or a change in plant-microbe interactions. The objective of this study was to determine the extent to which couplings among plant, fungal, and bacterial responses to N fertilization alter the activity of enzymes that are the primary agents of soil decomposition. We measured fungal and bacterial community composition, root-microbial interactions, and extracellular enzyme activity in the rhizosphere, bulk, and organic horizon of soils sampled from a long-term (>25 years), whole-watershed, N fertilization experiment at the Fernow Experimental Forest in West Virgini...Continue Reading

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Citations

Jul 1, 2018·Applied and Environmental Microbiology·Silvia PajaresJorge D Etchevers
Sep 1, 2018·Environmental Monitoring and Assessment·Kaizad F Patel, Ivan J Fernandez
Jan 10, 2021·The ISME Journal·Justin A MeedsMelanie D Jones
Nov 23, 2020·Environmental Monitoring and Assessment·Kaizad F PatelIvan J Fernandez
Oct 27, 2021·Environmental Science & Technology·Le-Zheng QinKun-Seop Lee

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