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Grassland species root response to drought: consequences for soil carbon and nitrogen availability

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Grassland species root response to drought : consequences for soil carbon and nitrogen availability. / De Vries, Franciska Trijntje; Brown, Caley; Stevens, Carly Joanne.

In: Plant and Soil, Vol. 409, No. 1, 12.2016, p. 297-312.

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@article{d22229325545440a960644a1bea9252a,
title = "Grassland species root response to drought: consequences for soil carbon and nitrogen availability",
abstract = "Background and AimsRoot traits are increasingly used to predict how plants modify soil processes. Here, we assessed how drought-induced changes in root systems of four common grassland species affected C and N availability in soil. We hypothesized that drought would promote resource-conservative root traits such as high root tissue density (RTD) and low specific root length (SRL), and that these changes would result in higher soil N availability through decreased root N uptake, but lower C availability through reduced root exudation.MethodsWe subjected individual plants to drought under controlled conditions, and compared the response of their root biomass, root traits, and soil C and N availability, to control individuals.ResultsDrought affected most root traits through reducing root biomass. Only SRL and RTD displayed plasticity; drought reduced SRL, and increased RTD in small plants but decreased RTD in larger plants. Reduced root biomass and a shift towards more resource-conservative root traits increased soil inorganic N availability but did not directly affect soil C availability.ConclusionsThese findings identify mechanisms through which drought-induced changes in root systems affect soil C and N availability, and contribute to our understanding of how root traits modify soil processes in a changing world.",
keywords = "Aboveground-belowground linkages, Plant functional traits, Plasticity, Soil microbial properties, Soil processes, Climate change",
author = "{De Vries}, {Franciska Trijntje} and Caley Brown and Stevens, {Carly Joanne}",
year = "2016",
month = dec
doi = "10.1007/s11104-016-2964-4",
language = "English",
volume = "409",
pages = "297--312",
journal = "Plant and Soil",
issn = "0032-079X",
publisher = "Springer International Publishing AG",
number = "1",

}

RIS

TY - JOUR

T1 - Grassland species root response to drought

T2 - consequences for soil carbon and nitrogen availability

AU - De Vries, Franciska Trijntje

AU - Brown, Caley

AU - Stevens, Carly Joanne

PY - 2016/12

Y1 - 2016/12

N2 - Background and AimsRoot traits are increasingly used to predict how plants modify soil processes. Here, we assessed how drought-induced changes in root systems of four common grassland species affected C and N availability in soil. We hypothesized that drought would promote resource-conservative root traits such as high root tissue density (RTD) and low specific root length (SRL), and that these changes would result in higher soil N availability through decreased root N uptake, but lower C availability through reduced root exudation.MethodsWe subjected individual plants to drought under controlled conditions, and compared the response of their root biomass, root traits, and soil C and N availability, to control individuals.ResultsDrought affected most root traits through reducing root biomass. Only SRL and RTD displayed plasticity; drought reduced SRL, and increased RTD in small plants but decreased RTD in larger plants. Reduced root biomass and a shift towards more resource-conservative root traits increased soil inorganic N availability but did not directly affect soil C availability.ConclusionsThese findings identify mechanisms through which drought-induced changes in root systems affect soil C and N availability, and contribute to our understanding of how root traits modify soil processes in a changing world.

AB - Background and AimsRoot traits are increasingly used to predict how plants modify soil processes. Here, we assessed how drought-induced changes in root systems of four common grassland species affected C and N availability in soil. We hypothesized that drought would promote resource-conservative root traits such as high root tissue density (RTD) and low specific root length (SRL), and that these changes would result in higher soil N availability through decreased root N uptake, but lower C availability through reduced root exudation.MethodsWe subjected individual plants to drought under controlled conditions, and compared the response of their root biomass, root traits, and soil C and N availability, to control individuals.ResultsDrought affected most root traits through reducing root biomass. Only SRL and RTD displayed plasticity; drought reduced SRL, and increased RTD in small plants but decreased RTD in larger plants. Reduced root biomass and a shift towards more resource-conservative root traits increased soil inorganic N availability but did not directly affect soil C availability.ConclusionsThese findings identify mechanisms through which drought-induced changes in root systems affect soil C and N availability, and contribute to our understanding of how root traits modify soil processes in a changing world.

KW - Aboveground-belowground linkages

KW - Plant functional traits

KW - Plasticity

KW - Soil microbial properties

KW - Soil processes

KW - Climate change

U2 - 10.1007/s11104-016-2964-4

DO - 10.1007/s11104-016-2964-4

M3 - Journal article

VL - 409

SP - 297

EP - 312

JO - Plant and Soil

JF - Plant and Soil

SN - 0032-079X

IS - 1

ER -