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Selsted, Merete Bang

  • Biology
  • Ecology


Merete Bang Selsted - DTU Orbit (03/06/14) Merete Bang Selsted - DTU Orbit (03/06/14) Merete Bang Selsted Risø National Laboratory for Sustainable Energy 11/01/07 to 03/09/13 Frederiksborgvej 399 P.O. Box 49, ECO - 309, Biosystem Department 4000, Roskilde [email protected] Mobile: 26286441 Job title: PhD student Biosystems Division 25/02/12 to 02/09/13 Ecosystems 25/02/12 to 10/05/12 Publications: Soil respiration is stimulated by elevated CO2 and reduced by summer drought: three years of measurements in a multifactor ecosystem manipulation experiment in a temperate heathland (CLIMAITE) This study investigated the impact of predicted future climatic and atmospheric conditions on soil respiration (RS) in a Danish Calluna‐Deschampsia‐heathland. A fully factorial in situ experiment with treatments of elevated atmospheric CO2 (+130 ppm), raised soil temperature (+0.4 °C) and extended summer drought (5–8% precipitation exclusion) was established in 2005. The average RS, observed in the control over 3 years of measurements (1.7 μmol CO2 m−2 sec−1), increased 38% under elevated CO2, irrespective of combination with the drought or temperature treatments. In contrast, extended summer drought decreased RS by 14%, while elevated soil temperature did not affect RS overall. A significant interaction between elevated temperature and drought resulted in further reduction of RS when these treatments were combined. A detailed analysis of short‐term RS dynamics associated with drought periods showed that RS was reduced by ~50% and was strongly correlated with soil moisture during these events. Recovery of RS to pre‐drought levels occurred within 2 weeks of rewetting; however, unexpected drought effects were observed several months after summer drought treatment in 2 of the 3 years, possibly due to reduced plant growth or changes in soil water holding capacity. An empirical model that predicts

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