Drought impact on carbon and water cycling in a Mediterranean &amp;lt;i&amp;gt;Quercus suber&amp;lt;/i&amp;gt; L. woodland during the extreme drought event in 2012

Piayda, Arndt; Dubbert, Maren; Rebmann, Corinna; Kolle, Olaf; Silva, Filipe Costa e; Correia, Alexandra; Pereira, J. S.; Werner, Christiane; Cuntz, Matthias

doi:10.5194/bg-11-7159-2014

Cited by 28 publications

(24 citation statements)

References 108 publications

(175 reference statements)

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“…Total aboveground biomass was relatively low compared to previous years (between 42 and 78 g m −2 ; see Fig. A1 in the Appendix) with a minimal fraction of dry biomass due to the considerable winter-spring drought in the hydrological year 2012 (Costa e Silva et al, 2015;Dubbert et al, 2014b;Piayda et al, 2014). Dry biomass from the previous season was removed from the plots at the end of summer 2011.…”

Section: Environmental Variables and Plant Parametersmentioning

confidence: 99%

Quantification of dynamic soil–vegetation feedbacks following an isotopically labelled precipitation pulse

Piayda¹,

Dubbert

Siegwolf

et al. 2017

Biogeosciences

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Abstract. The presence of vegetation alters hydrological cycles of ecosystems. Complex plant-soil interactions govern the fate of precipitation input and water transitions through ecosystem compartments. Disentangling these interactions is a major challenge in the field of ecohydrology and a pivotal foundation for understanding the carbon cycle of semiarid ecosystems. Stable water isotopes can be used in this context as tracer to quantify water movement through soilvegetation-atmosphere interfaces.The aim of this study is to disentangle vegetation effects on soil water infiltration and distribution as well as dynamics of soil evaporation and grassland water use in a Mediterranean cork oak woodland during dry conditions. An irrigation experiment using δ 18 O labelled water was carried out in order to quantify distinct effects of tree and herbaceous vegetation on the infiltration and distribution of event water in the soil profile. Dynamic responses of soil and herbaceous vegetation fluxes to precipitation regarding event water use, water uptake depth plasticity, and contribution to ecosystem soil evaporation and transpiration were quantified.Total water loss to the atmosphere from bare soil was as high as from vegetated soil, utilizing large amounts of unproductive evaporation for transpiration, but infiltration rates decreased. No adjustments of main root water uptake depth to changes in water availability could be observed during the experiment. This forces understorey plants to compete with adjacent trees for water in deeper soil layers at the onset of summer. Thus, understorey plants are subjected to chronic water deficits faster, leading to premature senescence at the onset of drought. Despite this water competition, the presence of cork oak trees fosters infiltration and reduces evapotranspirative water losses from the understorey and the soil, both due to altered microclimatic conditions under crown shading. This study highlights complex soilplant-atmosphere and inter-species interactions controlling rain pulse transitions through a typical Mediterranean savannah ecosystem, disentangled by the use of stable water isotopes.

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Section: Environmental Variables and Plant Parametersmentioning

confidence: 99%

Quantification of dynamic soil–vegetation feedbacks following an isotopically labelled precipitation pulse

Piayda¹,

Dubbert

Siegwolf

et al. 2017

Biogeosciences

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“…Equation (9) is an attempt to capture the ecological optimality hypothesis that evolutionary selection pressures drive ecosystems towards maximal utilization of available resources (Raupach, 2005) without imposing an optimal carbon allocation scheme. Maximum rooting depths (Table 1) are set according to the depth at which the cumulative root fraction from the surface is 99 %, as estimated by Zeng (2001), using data from Canadell et al (1996).…”

Section: Modified Modelmentioning

confidence: 99%

“…where c u is the exponent for an assumed exponential wind profile (Raupach, 1994). L is the local Obukhov length, correspondingly given by…”

Section: Improved Parameterization Of In-canopy Resistance To Turbulementioning

confidence: 99%

“…Piayda et al, 2014;Zhou et al, 2013). In light of this we conducted an experiment using the SLI model configuration, modified such that the maximum rate of RuBisCO activity (V cmax ) and the potential rate of electron transport (J max ) were reduced by the drought response factor f w,soil , while the drought response of stomatal conductance was disabled.…”

Section: Alternative Drought Response Mechanismmentioning

confidence: 99%

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Improved representations of coupled soil–canopy processes in the CABLE land surface model (Subversion revision 3432)

et al. 2016

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Abstract. CABLE is a global land surface model, which has been used extensively in offline and coupled simulations. While CABLE performs well in comparison with other land surface models, results are impacted by decoupling of transpiration and photosynthesis fluxes under drying soil conditions, often leading to implausibly high water use efficiencies. Here, we present a solution to this problem, ensuring that modelled transpiration is always consistent with modelled photosynthesis, while introducing a parsimonious single-parameter drought response function which is coupled to root water uptake. We further improve CABLE's simulation of coupled soil-canopy processes by introducing an alternative hydrology model with a physically accurate representation of coupled energy and water fluxes at the soil-air interface, including a more realistic formulation of transfer under atmospherically stable conditions within the canopy and in the presence of leaf litter. The effects of these model developments are assessed using data from 18 stations from the global eddy covariance FLUXNET database, selected to span a large climatic range. Marked improvements are demonstrated, with root mean squared errors for monthly latent heat fluxes and water use efficiencies being reduced by 40 %. Results highlight the important roles of deep soil moisture in mediating drought response and litter in dampening soil evaporation.

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“…Piayda et al (2014) quantified the impacts of the extreme drought event in 2012 on carbon and water cycling in a Mediterranean woodland. The drought reduced overstory GPP in 2012 by 28 % and carbon-sink strength by 38 % compared to 2011.…”

Section: Methods and Findingsmentioning

confidence: 99%

Preface: Impacts of extreme climate events and disturbances on carbon dynamics

Xiao

Stoy

2016

Biogeosciences

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Abstract. The impacts of extreme climate events and disturbances (ECE&D) on the carbon cycle have received growing attention in recent years. This special issue showcases a collection of recent advances in understanding the impacts of ECE&D on carbon cycling. Notable advances include quantifying how harvesting activities impact forest structure, carbon pool dynamics, and recovery processes; observed drastic increases of the concentrations of dissolved organic carbon and dissolved methane in thermokarst lakes in western Siberia during a summer warming event; disentangling the roles of herbivores and fire on forest carbon dioxide flux; direct and indirect impacts of fire on the global carbon balance; and improved atmospheric inversion of regional carbon sources and sinks by incorporating disturbances. Combined, studies herein indicate several major research needs. First, disturbances and extreme events can interact with one another, and it is important to understand their overall impacts and also disentangle their effects on the carbon cycle. Second, current ecosystem models are not skillful enough to correctly simulate the underlying processes and impacts of ECE&D (e.g., tree mortality and carbon consequences). Third, benchmark data characterizing the timing, location, type, and magnitude of disturbances must be systematically created to improve our ability to quantify carbon dynamics over large areas. Finally, improving the representation of ECE&D in regional climate/earth system models and accounting for the resulting feedbacks to climate are essential for understanding the interactions between climate and ecosystem dynamics.

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Drought impact on carbon and water cycling in a Mediterranean <i>Quercus suber</i> L. woodland during the extreme drought event in 2012

Cited by 28 publications

References 108 publications

Quantification of dynamic soil–vegetation feedbacks following an isotopically labelled precipitation pulse

Quantification of dynamic soil–vegetation feedbacks following an isotopically labelled precipitation pulse

Improved representations of coupled soil–canopy processes in the CABLE land surface model (Subversion revision 3432)

Preface: Impacts of extreme climate events and disturbances on carbon dynamics

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