Alf Ekblad
Om Alf Ekblad
Jag är professor i biologi med inriktning ekosystemekologi. Mina forskning berör främst: växt-mark interaktioner, växt-mikrobinteraktioner, stabila isotoper i ekologisk forskning samtkretslopp av kol och kväve i skogsekosystem. Jag har även bedrivit studier i jordbrukssystem. Jag är bland annat intresserad av hur förhöjd koldioxidhalt och ett förändrat klimat samt kvävegödsling/kvävnedfall påverkar kolomsättning och uppbyggnad av kol- och kväveförrådet i marken. Betydelsen av mykorrhizamycel för uppbyggnaden av kol i marken har varit i fokus på senare år. Denna forskning sker delvis i samarbete med forskare i den starka forskningsmiljön IMPRESS.
Jag har ett brett ekologiskt intresse samarbetar med flera andra forskare i Sverige och utomlands i ett flertal olika projekt. I många av de projekten värdesätts mitt isotoplaboratorium och mina kunskaper då det gäller användningen av stabila isotoper i olika ekologiska sammanhang.
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Alf Ekblad
An alpine treeline in a carbon dioxide-rich world: synthesis of a nine-year free-air carbon dioxide enrichment study
We evaluated the impacts of elevated CO 2 in a treeline ecosystem in the Swiss Alps in a 9-year f more We evaluated the impacts of elevated CO 2 in a treeline ecosystem in the Swiss Alps in a 9-year free-air CO 2 enrichment (FACE) study. We present new data and synthesize plant and soil results from the entire experimental period. Light-saturated photosynthesis (A max) of ca. year-old Larix decidua and Pinus uncinata was stimulated by elevated CO 2 throughout the experiment. Slight down-regulation of photosynthesis in Pinus was consistent with starch accumulation in needle tissue. Above-ground growth responses differed between tree species, with a 33 % mean annual stimulation in Larix but no response in Pinus. Species-specific CO 2 responses also occurred for abundant dwarf shrub species in the understorey, where Vaccinium myrtillus showed a sustained shoot growth enhancement (?11 %) that was not apparent for Vaccinium gaultherioides or Empetrum hermaphroditum. Below Keywords Carbon cycling Á Dwarf shrub Á Global change Á Nitrogen Á Treeline coni
Ecosystem Ecology
The research in Ecosystem ecology has the main overall aim to increase our understanding of terrestrial plant-soil-microbe systems. Currently much effort is placed on the carbon cycle and in particular processes that occur in the soil such as soil respiration, litter decomposition and the production and turnover of ectomycorrhizal mycelium. Soil processes is inherently difficult to study. Traditionally soil samples have been brought to the laboratory and processes have been studied on sieved and, consequently, highly disturbed soil samples. This disrupts the intimate relationships between plant roots and soil microorganisms. The development of stable isotope methods and instruments has open possibilities to study soil processes in situ in the undisturbed ecosystem. At Orebro Isotope Laboraratory (OIL) we have two Isotope Ratio Mass Spectrometers and additional equipment allowing analyses of natural and manipulated variations in the occurrence of isotopes of light elements (13C, 18O, 15N, D) in gases, bulk organic materials as well as in specific compounds. We also have a portable laser instrument (Picarro i) allowing on line measurements of 12C
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