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Title: Nutrient foraging by mycorrhizas: From species functional traits to ecosystem processes

Journal Article · · Functional Ecology

Abstract Plant roots and the associated mycorrhizal fungal hyphae often selectively proliferate into patchily distributed soil nutrient hotspots, but interactions between these two components of a mycorrhizal root system are usually ignored or experimentally isolated in nutrient foraging studies. From studies in which both roots and mycorrhizal hyphae had access to nutrient hotspots, we compiled data on root foraging precision (increase in roots in nutrient hotspots relative to outside hotspots) of plant species from different ecosystems, ranging from temperate grasslands to subtropical forests. We found that root foraging precision across the wide range of plant species was strongly influenced by root morphology and mycorrhizal type. The precision of root nutrient foraging, as a plant functional trait, may coordinate with other root traits that are related to the economics of nutrient acquisition. High foraging precision is expected to associate with the strategy of fast return on the investment in roots, such as low construction cost, high metabolic rate and rapid turnover. Nutrient foraging by mycorrhizal fungi alone may be influenced by functional traits such as hyphal exploration distance, hyphal turnover, and hyphal uptake capacity and efficiency, but such data are limited to a small portion of mycorrhizal fungal species. We propose a conceptual framework in which to simulate nitrogen and phosphorus acquisition from both nutrient hotspots and outside hotspots in mixed‐species plant communities. Simulation outputs suggest that plant species with varying root morphology and mycorrhizal type can be adaptive to a range of nutrient heterogeneity. Although there are still knowledge gaps related to nutrient foraging, as well as many unexplored plant and fungal species, we suggest that scaling nutrient foraging from individual plants to communities would advance understanding of plant species interactions and below‐ground ecosystem function. A plain language summary is available for this article.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Contributing Organization:
National Science Foundation, Penn State University
Grant/Contract Number:
SC0012003; DE‐SC0012003
OSTI ID:
1419617
Alternate ID(s):
OSTI ID: 1419089
Journal Information:
Functional Ecology, Vol. 32, Issue 4; ISSN 0269-8463
Publisher:
British Ecological Society; WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 51 works
Citation information provided by
Web of Science

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Cited By (7)

Root diameter predicts the extramatrical hyphal exploration distance of the ectomycorrhizal fungal community journal April 2018
Plant-mediated partner discrimination in ectomycorrhizal mutualisms journal January 2019
Contrasting root foraging strategies of two subtropical coniferous forests under an increased diversity of understory species journal January 2019
Roots and arbuscular mycorrhizal fungi are independent in nutrient foraging across subtropical tree species journal June 2019
Trait complementarity between fine roots of Stipa purpurea and their associated arbuscular mycorrhizal fungi along a precipitation gradient in Tibetan alpine steppe journal March 2019
Tree mycorrhizal associations mediate soil fertility effects on forest community structure in a temperate forest journal March 2019
Ectomycorrhizal Fungal Communities and Their Functional Traits Mediate Plant–Soil Interactions in Trace Element Contaminated Soils journal November 2018