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Title: Climate, soil mineralogy and mycorrhizal fungi influence soil organic matter fractions in eastern US temperate forests

Abstract

Abstract Identifying the primary controls of particulate (POM) and mineral‐associated organic matter (MAOM) content in soils is critical for determining future stocks of soil carbon (C) and nitrogen (N) across the globe. However, drivers of these soil organic matter fractions are likely to vary among ecosystems in response to climate, soil type and the composition of local biological communities. We tested how soil factors, climate and plant–fungal associations influenced the distribution and concentrations of C and N in MAOM and POM in seven temperate forests in the National Ecological Observatory Network (NEON) across the eastern United States. Samples of upper mineral horizon soil within each forest were collected in plots representing a gradient of dominant tree–mycorrhizal association, allowing us to test how plant and microbial communities influenced POM and MAOM across sites differing in climate and soil conditions. We found that concentrations of C and N in soil organic matter were primarily driven by soil mineralogy, but the relative abundance of MAOM versus POM C was strongly linked to plot‐level mycorrhizal dominance. Furthermore, the effect of dominant tree mycorrhizal type on the distribution of N among POM and MAOM fractions was sensitive to local climate: in cooler sites, an increasingmore » proportion of ectomycorrhizal‐associated trees was associated with lower proportions of N in MAOM, but in warmer sites, we found the reverse. As an indicator of soil carbon age, we measured radiocarbon in the MAOM fraction but found that within and across sites, Δ 14 C was unrelated to mycorrhizal dominance, climate, or soil factors, suggesting that additional site‐specific factors may be primary determinants of long‐term SOM persistence. Synthesis . Our results indicate that while soil mineralogy primarily controls SOM C and N concentrations, the distribution of SOM among density fractions depends on the composition of vegetation and microbial communities, with these effects varying across sites with distinct climates. We also suggest that within biomes, the age of mineral‐associated soil carbon is not clearly linked to the factors that control concentrations of MAOM C and N.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]
  1. Indiana University, Bloomington, IN (United States)
  2. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); University of California, Merced, CA (United States)
  3. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States). Center for Accelerator Mass Spectrometry
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
OSTI Identifier:
1985216
Alternate Identifier(s):
OSTI ID: 1984291
Report Number(s):
LLNL-JRNL-844900
Journal ID: ISSN 0022-0477; 1068377
Grant/Contract Number:  
AC52-07NA27344; 2010724; DE‐AC52‐07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Ecology
Additional Journal Information:
Journal Volume: 111; Journal Issue: 6; Journal ID: ISSN 0022-0477
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Lang, Ashley K., Pett‐Ridge, Jennifer, McFarlane, Karis J., and Phillips, Richard P. Climate, soil mineralogy and mycorrhizal fungi influence soil organic matter fractions in eastern US temperate forests. United States: N. p., 2023. Web. doi:10.1111/1365-2745.14094.
Lang, Ashley K., Pett‐Ridge, Jennifer, McFarlane, Karis J., & Phillips, Richard P. Climate, soil mineralogy and mycorrhizal fungi influence soil organic matter fractions in eastern US temperate forests. United States. https://doi.org/10.1111/1365-2745.14094
Lang, Ashley K., Pett‐Ridge, Jennifer, McFarlane, Karis J., and Phillips, Richard P. Mon . "Climate, soil mineralogy and mycorrhizal fungi influence soil organic matter fractions in eastern US temperate forests". United States. https://doi.org/10.1111/1365-2745.14094. https://www.osti.gov/servlets/purl/1985216.
@article{osti_1985216,
title = {Climate, soil mineralogy and mycorrhizal fungi influence soil organic matter fractions in eastern US temperate forests},
author = {Lang, Ashley K. and Pett‐Ridge, Jennifer and McFarlane, Karis J. and Phillips, Richard P.},
abstractNote = {Abstract Identifying the primary controls of particulate (POM) and mineral‐associated organic matter (MAOM) content in soils is critical for determining future stocks of soil carbon (C) and nitrogen (N) across the globe. However, drivers of these soil organic matter fractions are likely to vary among ecosystems in response to climate, soil type and the composition of local biological communities. We tested how soil factors, climate and plant–fungal associations influenced the distribution and concentrations of C and N in MAOM and POM in seven temperate forests in the National Ecological Observatory Network (NEON) across the eastern United States. Samples of upper mineral horizon soil within each forest were collected in plots representing a gradient of dominant tree–mycorrhizal association, allowing us to test how plant and microbial communities influenced POM and MAOM across sites differing in climate and soil conditions. We found that concentrations of C and N in soil organic matter were primarily driven by soil mineralogy, but the relative abundance of MAOM versus POM C was strongly linked to plot‐level mycorrhizal dominance. Furthermore, the effect of dominant tree mycorrhizal type on the distribution of N among POM and MAOM fractions was sensitive to local climate: in cooler sites, an increasing proportion of ectomycorrhizal‐associated trees was associated with lower proportions of N in MAOM, but in warmer sites, we found the reverse. As an indicator of soil carbon age, we measured radiocarbon in the MAOM fraction but found that within and across sites, Δ 14 C was unrelated to mycorrhizal dominance, climate, or soil factors, suggesting that additional site‐specific factors may be primary determinants of long‐term SOM persistence. Synthesis . Our results indicate that while soil mineralogy primarily controls SOM C and N concentrations, the distribution of SOM among density fractions depends on the composition of vegetation and microbial communities, with these effects varying across sites with distinct climates. We also suggest that within biomes, the age of mineral‐associated soil carbon is not clearly linked to the factors that control concentrations of MAOM C and N.},
doi = {10.1111/1365-2745.14094},
journal = {Journal of Ecology},
number = 6,
volume = 111,
place = {United States},
year = {Mon Mar 13 00:00:00 EDT 2023},
month = {Mon Mar 13 00:00:00 EDT 2023}
}

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