Preface &amp;quot;Biotic interactions and biogeochemical processes in the soil environment&amp;quot;

Subke, Jens‐Arne; Carbone, Mariah S.; Khomik, Myroslava; Stoy, Paul C.; Bahn, Michael

doi:10.5194/bg-9-1823-2012

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…Currently our ability to predict soil respiration dynamics relies on moisture and temperature. This creates severe limitations when we attempt to understand soil respiration and ecosystem C storage under future climate scenarios (Subke et al, 2012). Plant phenologies have evolved in order for plant growth to overlap with suitable environmental conditions, but climate change disrupts this synchrony.…”

Section: Impacts Of Invasion On Soil C Dynamics In Cssmentioning

confidence: 99%

Altered phenology and temperature sensitivity of invasive annual grasses and forbs changes autotrophic and heterotrophic respiration rates in a semi-arid shrub community

Mauritz

Lipson

2013

Preprint

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Many invasions, like the wide-spread establishment of annual grasses and forbs in semi-arid shrublands, are associated with climate change. In order to predict ecosystem carbon (C) storage it is critical that we understand how invasion affects soil respiration (Rt). Because plants and microbes have different seasonal dynamics, determining the relative contribution of autotrophic (Ra) and heterotrophic (Rh) respiration provides critical insight into soil C processes. Using automated soil respiration measurements and root exclusion cores we evaluated the moisture and temperature sensitivity of Rt and Rh and calculated the contribution of Ra in native shrub and invaded areas.

Invasion increased cumulative Rt by 40% from 695 (±51) g C m⁻² under shrubs to 1050 g C m⁻² (±44) in invaded areas. Cumulative Rh did not change but invasion altered the seasonal pattern of Rh. Throughout the season Rt and Rh responded positively to temperature increases when soils were wet and negatively when soils were dry. Invasion increased temperature sensitivity of Rt and Rh in wet soils and decreased temperature sensitivity in dry soils. The altered temperature sensitivity of invasives was attributed largely to differences in phenology. Early phenology of invasive grasses caused rapid Ra increases early in the season; late phenology of invasive forbs resulted in the surprising maintenance of diurnal Ra and Rh signals despite high temperatures and low soil moisture.

Invasion extended the respiration season of the system. Ability of the invasive community to withstand high temperatures and drought could confer greater resilience if temperature and precipitation patterns in the region change. The high contribution of Ra by invasive annuals means ecosystem C storage will depend heavily on seasonal rainfall dynamics and productivity of invasive annuals. In semi-arid ecosystems even small scale changes in plant community composition alter Rt, Ra and Rh and should be considered when attempting to predict Rt

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Section: Impacts Of Invasion On Soil C Dynamics In Cssmentioning

confidence: 99%

Altered phenology and temperature sensitivity of invasive annual grasses and forbs changes autotrophic and heterotrophic respiration rates in a semi-arid shrub community

Mauritz

Lipson

2013

Preprint

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Preface "Stable Isotopes and Biogeochemical Cycles in Terrestrial Ecosystems''

Bahn¹,

Buchmann²,

Knohl³

2012

Biogeosciences

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Preface "Biotic interactions and biogeochemical processes in the soil environment"

Cited by 2 publications

References 13 publications

Altered phenology and temperature sensitivity of invasive annual grasses and forbs changes autotrophic and heterotrophic respiration rates in a semi-arid shrub community

Altered phenology and temperature sensitivity of invasive annual grasses and forbs changes autotrophic and heterotrophic respiration rates in a semi-arid shrub community

Preface "Stable Isotopes and Biogeochemical Cycles in Terrestrial Ecosystems''

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Preface &quot;Biotic interactions and biogeochemical processes in the soil environment&quot;

Cited by 2 publications

References 13 publications

Altered phenology and temperature sensitivity of invasive annual grasses and forbs changes autotrophic and heterotrophic respiration rates in a semi-arid shrub community

Altered phenology and temperature sensitivity of invasive annual grasses and forbs changes autotrophic and heterotrophic respiration rates in a semi-arid shrub community

Preface &quot;Stable Isotopes and Biogeochemical Cycles in Terrestrial Ecosystems''

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Preface "Biotic interactions and biogeochemical processes in the soil environment"

Preface "Stable Isotopes and Biogeochemical Cycles in Terrestrial Ecosystems''