Temporal dynamics of fine roots under long-term exposure to elevated CO2 in the Mojave Desert

Derek L Sonderegger, Kiona Ogle, R. Dave Evans, Scot Ferguson, Robert S. Nowak

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Deserts are considered 'below-ground dominated', yet little is known about the impact of rising CO2 in combination with natural weather cycles on long-term dynamics of root biomass. This study quantifies the temporal dynamics of fine-root production, loss and standing crop in an intact desert ecosystem exposed to 10 yr of elevated CO2. We used monthly minirhizotron observations from 4 yr (2003-2007) for two dominant shrub species and along community transects at the Nevada Desert free-air CO2 enrichment Facility. Data were synthesized within a Bayesian framework that included effects of CO2 concentration, cover type, phenological period, antecedent soil water and biological inertia (i.e. the influence of prior root production and loss). Elevated CO2 treatment interacted with antecedent soil moisture and had significantly greater effects on fine-root dynamics during certain phenological periods. With respect to biological inertia, plants under elevated CO2 tended to initiate fine-root growth sooner and sustain growth longer, with the net effect of increasing the magnitude of production and mortality cycles. Elevated CO2 interacts with past environmental (e.g. antecedent soil water) and biological (e.g. biological inertia) factors to affect fine-root dynamics, and such interactions are expected to be important for predicting future soil carbon pools.

Original languageEnglish (US)
Pages (from-to)127-138
Number of pages12
JournalNew Phytologist
Volume198
Issue number1
DOIs
StatePublished - Apr 2013

Fingerprint

Mojave Desert
chronic exposure
Soil
carbon dioxide
deserts
soil water
Water
Weather
Biological Factors
Growth
Biomass
Ecosystem
Carbon
Air
Mortality
fine roots
carbon sinks
root growth
weather
shrubs

Keywords

  • Ambrosia dumosia
  • Bayesian
  • Elevated CO
  • FACE (free-air CO enrichment)
  • Fine roots
  • Larrea tridentata
  • Mojave Desert
  • Temporal dynamics

ASJC Scopus subject areas

  • Plant Science
  • Physiology

Cite this

Temporal dynamics of fine roots under long-term exposure to elevated CO2 in the Mojave Desert. / Sonderegger, Derek L; Ogle, Kiona; Evans, R. Dave; Ferguson, Scot; Nowak, Robert S.

In: New Phytologist, Vol. 198, No. 1, 04.2013, p. 127-138.

Research output: Contribution to journalArticle

Sonderegger, Derek L ; Ogle, Kiona ; Evans, R. Dave ; Ferguson, Scot ; Nowak, Robert S. / Temporal dynamics of fine roots under long-term exposure to elevated CO2 in the Mojave Desert. In: New Phytologist. 2013 ; Vol. 198, No. 1. pp. 127-138.
@article{5867a2ca00f847168533747a546cfb16,
title = "Temporal dynamics of fine roots under long-term exposure to elevated CO2 in the Mojave Desert",
abstract = "Deserts are considered 'below-ground dominated', yet little is known about the impact of rising CO2 in combination with natural weather cycles on long-term dynamics of root biomass. This study quantifies the temporal dynamics of fine-root production, loss and standing crop in an intact desert ecosystem exposed to 10 yr of elevated CO2. We used monthly minirhizotron observations from 4 yr (2003-2007) for two dominant shrub species and along community transects at the Nevada Desert free-air CO2 enrichment Facility. Data were synthesized within a Bayesian framework that included effects of CO2 concentration, cover type, phenological period, antecedent soil water and biological inertia (i.e. the influence of prior root production and loss). Elevated CO2 treatment interacted with antecedent soil moisture and had significantly greater effects on fine-root dynamics during certain phenological periods. With respect to biological inertia, plants under elevated CO2 tended to initiate fine-root growth sooner and sustain growth longer, with the net effect of increasing the magnitude of production and mortality cycles. Elevated CO2 interacts with past environmental (e.g. antecedent soil water) and biological (e.g. biological inertia) factors to affect fine-root dynamics, and such interactions are expected to be important for predicting future soil carbon pools.",
keywords = "Ambrosia dumosia, Bayesian, Elevated CO, FACE (free-air CO enrichment), Fine roots, Larrea tridentata, Mojave Desert, Temporal dynamics",
author = "Sonderegger, {Derek L} and Kiona Ogle and Evans, {R. Dave} and Scot Ferguson and Nowak, {Robert S.}",
year = "2013",
month = "4",
doi = "10.1111/nph.12128",
language = "English (US)",
volume = "198",
pages = "127--138",
journal = "New Phytologist",
issn = "0028-646X",
publisher = "Wiley-Blackwell",
number = "1",

}

TY - JOUR

T1 - Temporal dynamics of fine roots under long-term exposure to elevated CO2 in the Mojave Desert

AU - Sonderegger, Derek L

AU - Ogle, Kiona

AU - Evans, R. Dave

AU - Ferguson, Scot

AU - Nowak, Robert S.

PY - 2013/4

Y1 - 2013/4

N2 - Deserts are considered 'below-ground dominated', yet little is known about the impact of rising CO2 in combination with natural weather cycles on long-term dynamics of root biomass. This study quantifies the temporal dynamics of fine-root production, loss and standing crop in an intact desert ecosystem exposed to 10 yr of elevated CO2. We used monthly minirhizotron observations from 4 yr (2003-2007) for two dominant shrub species and along community transects at the Nevada Desert free-air CO2 enrichment Facility. Data were synthesized within a Bayesian framework that included effects of CO2 concentration, cover type, phenological period, antecedent soil water and biological inertia (i.e. the influence of prior root production and loss). Elevated CO2 treatment interacted with antecedent soil moisture and had significantly greater effects on fine-root dynamics during certain phenological periods. With respect to biological inertia, plants under elevated CO2 tended to initiate fine-root growth sooner and sustain growth longer, with the net effect of increasing the magnitude of production and mortality cycles. Elevated CO2 interacts with past environmental (e.g. antecedent soil water) and biological (e.g. biological inertia) factors to affect fine-root dynamics, and such interactions are expected to be important for predicting future soil carbon pools.

AB - Deserts are considered 'below-ground dominated', yet little is known about the impact of rising CO2 in combination with natural weather cycles on long-term dynamics of root biomass. This study quantifies the temporal dynamics of fine-root production, loss and standing crop in an intact desert ecosystem exposed to 10 yr of elevated CO2. We used monthly minirhizotron observations from 4 yr (2003-2007) for two dominant shrub species and along community transects at the Nevada Desert free-air CO2 enrichment Facility. Data were synthesized within a Bayesian framework that included effects of CO2 concentration, cover type, phenological period, antecedent soil water and biological inertia (i.e. the influence of prior root production and loss). Elevated CO2 treatment interacted with antecedent soil moisture and had significantly greater effects on fine-root dynamics during certain phenological periods. With respect to biological inertia, plants under elevated CO2 tended to initiate fine-root growth sooner and sustain growth longer, with the net effect of increasing the magnitude of production and mortality cycles. Elevated CO2 interacts with past environmental (e.g. antecedent soil water) and biological (e.g. biological inertia) factors to affect fine-root dynamics, and such interactions are expected to be important for predicting future soil carbon pools.

KW - Ambrosia dumosia

KW - Bayesian

KW - Elevated CO

KW - FACE (free-air CO enrichment)

KW - Fine roots

KW - Larrea tridentata

KW - Mojave Desert

KW - Temporal dynamics

UR - http://www.scopus.com/inward/record.url?scp=84874218567&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84874218567&partnerID=8YFLogxK

U2 - 10.1111/nph.12128

DO - 10.1111/nph.12128

M3 - Article

C2 - 23356437

AN - SCOPUS:84874218567

VL - 198

SP - 127

EP - 138

JO - New Phytologist

JF - New Phytologist

SN - 0028-646X

IS - 1

ER -