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Title: Inorganic N addition replaces N supplied to switchgrass ( Panicum virgatum ) by arbuscular mycorrhizal fungi

Abstract

Arbuscular mycorrhizal fungi (AMF) provide many benefits in agroecosystems including improved soil tilth, carbon sequestration, and water and nutrient transfer to plants. AMF are known to affect plant nitrogen (N) dynamics and transfer N to plants, but there have been few studies addressing whether the amount of N transferred to plants by AMF is agronomically relevant. We used δ15N natural abundance methods and δ15N mass balance equations to estimate the amount of plant N derived from AMF transfer in perennial grasses managed for bioenergy production under different N addition treatments (0, 56, and 196 kg N/ha). Differentiation of δ15N among plant, soil N, and AMF pools was higher than anticipated leading to calculations of 34–55% of plant N transferred by AMF in the treatments receiving no N addition to 6–22% of plant N transferred to plants in high-N addition treatments. AMF extra-radical hyphae biomass was significantly reduced in the high-N (196 kg N/ha) addition treatments, which was negatively correlated to enriched plant δ15N. Our results suggest that N addition decreases AMF N transfer to plants. When N was limiting to plant growth, AMF supplied agronomically significant amounts of plant N, and a higher proportion of overall plant N. Because differentiationmore » between N pools was greater than expected, stable isotope measurements can be used to estimate N transfer to AMF plant hosts.« less

Authors:
 [1];  [1]
  1. Univ. of Wisconsin, Madison, WI (United States); Great Lakes Bioenergy Research Center (GLBRC), Madison, WI (United States)
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States); Battelle Memorial Institute, Columbus, OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1799678
Grant/Contract Number:  
FC02-07ER64494; AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Ecological Applications
Additional Journal Information:
Journal Volume: 30; Journal Issue: 2; Journal ID: ISSN 1051-0761
Publisher:
Ecological Society of America
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Environmental Sciences & Ecology

Citation Formats

Jach‐Smith, Laura C., and Jackson, Randall D. Inorganic N addition replaces N supplied to switchgrass ( Panicum virgatum ) by arbuscular mycorrhizal fungi. United States: N. p., 2019. Web. doi:10.1002/eap.2047.
Jach‐Smith, Laura C., & Jackson, Randall D. Inorganic N addition replaces N supplied to switchgrass ( Panicum virgatum ) by arbuscular mycorrhizal fungi. United States. https://doi.org/10.1002/eap.2047
Jach‐Smith, Laura C., and Jackson, Randall D. Sat . "Inorganic N addition replaces N supplied to switchgrass ( Panicum virgatum ) by arbuscular mycorrhizal fungi". United States. https://doi.org/10.1002/eap.2047. https://www.osti.gov/servlets/purl/1799678.
@article{osti_1799678,
title = {Inorganic N addition replaces N supplied to switchgrass ( Panicum virgatum ) by arbuscular mycorrhizal fungi},
author = {Jach‐Smith, Laura C. and Jackson, Randall D.},
abstractNote = {Arbuscular mycorrhizal fungi (AMF) provide many benefits in agroecosystems including improved soil tilth, carbon sequestration, and water and nutrient transfer to plants. AMF are known to affect plant nitrogen (N) dynamics and transfer N to plants, but there have been few studies addressing whether the amount of N transferred to plants by AMF is agronomically relevant. We used δ15N natural abundance methods and δ15N mass balance equations to estimate the amount of plant N derived from AMF transfer in perennial grasses managed for bioenergy production under different N addition treatments (0, 56, and 196 kg N/ha). Differentiation of δ15N among plant, soil N, and AMF pools was higher than anticipated leading to calculations of 34–55% of plant N transferred by AMF in the treatments receiving no N addition to 6–22% of plant N transferred to plants in high-N addition treatments. AMF extra-radical hyphae biomass was significantly reduced in the high-N (196 kg N/ha) addition treatments, which was negatively correlated to enriched plant δ15N. Our results suggest that N addition decreases AMF N transfer to plants. When N was limiting to plant growth, AMF supplied agronomically significant amounts of plant N, and a higher proportion of overall plant N. Because differentiation between N pools was greater than expected, stable isotope measurements can be used to estimate N transfer to AMF plant hosts.},
doi = {10.1002/eap.2047},
journal = {Ecological Applications},
number = 2,
volume = 30,
place = {United States},
year = {Sat Nov 23 00:00:00 EST 2019},
month = {Sat Nov 23 00:00:00 EST 2019}
}

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