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Tradeoffs and Synergies in Tropical Forest Root Traits and Dynamics for Nutrient and Water Acquisition: Field and Modeling Advances

Daniela Cusack 1 Shalom Addo-Danso 2 Elizabeth Agee Kelly Andersen 3 Marie Arnaud 4, 5 Sarah Batterman 6 Francis Brearley 7 Mark Ciochina 8 Amanda Cordeiro 1 Caroline Dallstream 9 Milton Diaz-Toribio Lee Dietterich 1 Joshua Fisher 10 Katrin Fleischer 11 Claire Fortunel 12 Lucia Fuchslueger 13 Nathaly Guerrero-Ramírez 14 Martyna Kotowska 14 Laynara Lugli 15 César Marín 16, 17 Lindsay Mcculloch 18 Jean-Luc Maeght 12 Dan Metcalfe Richard Norby Rafael Oliveira Jennifer Powers Tatiana Reichert Stuart Smith Chris Smith-Martin Fiona Soper Laura Toro Maria Umaña Oscar Valverde-Barrantes Monique Weemstra Leland Werden Michelle Wong 19 Cynthia Wright Stuart Wright 6 Daniela Yaffar
Abstract : Vegetation processes are fundamentally limited by nutrient and water availability, the uptake of which is mediated by plant roots in terrestrial ecosystems. While tropical forests play a central role in global water, carbon, and nutrient cycling, we know very little about tradeoffs and synergies in root traits that respond to resource scarcity. Tropical trees face a unique set of resource limitations, with rock-derived nutrients and moisture seasonality governing many ecosystem functions, and nutrient versus water availability often separated spatially and temporally. Root traits that characterize biomass, depth distributions, production and phenology, morphology, physiology, chemistry, and symbiotic relationships can be predictive of plants’ capacities to access and acquire nutrients and water, with links to aboveground processes like transpiration, wood productivity, and leaf phenology. In this review, we identify an emerging trend in the literature that tropical fine root biomass and production in surface soils are greatest in infertile or sufficiently moist soils. We also identify interesting paradoxes in tropical forest root responses to changing resources that merit further exploration. For example, specific root length, which typically increases under resource scarcity to expand the volume of soil explored, instead can increase with greater base cation availability, both across natural tropical forest gradients and in fertilization experiments. Also, nutrient additions, rather than reducing mycorrhizal colonization of fine roots as might be expected, increased colonization rates under scenarios of water scarcity in some forests. Efforts to include fine root traits and functions in vegetation models have grown more sophisticated over time, yet there is a disconnect between the emphasis in models characterizing nutrient and water uptake rates and carbon costs versus the emphasis in field experiments on measuring root biomass, production, and morphology in response to changes in resource availability. Closer integration of field and modeling efforts could connect mechanistic investigation of fine-root dynamics to ecosystem-scale understanding of nutrient and water cycling, allowing us to better predict tropical forest-climate feedbacks.
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Submitted on : Thursday, December 2, 2021 - 2:17:17 PM
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Daniela Cusack, Shalom Addo-Danso, Elizabeth Agee, Kelly Andersen, Marie Arnaud, et al.. Tradeoffs and Synergies in Tropical Forest Root Traits and Dynamics for Nutrient and Water Acquisition: Field and Modeling Advances. Frontiers in Forests and Global Change, Frontiers Media, 2021, 4, ⟨10.3389/ffgc.2021.704469⟩. ⟨hal-03463424⟩



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