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  1. No Access

    Article

    Can tree-ring δ15N be used as a proxy for foliar δ15N in European beech and Norway spruce?

    For long-term environmental investigations, tree-ring δ 15 N values are inappropriate proxies for foliar δ ...

    G. Tomlinson, N. Buchmann, R. Siegwolf, P. Weber, A. Thimonier, E. Graf Pannatier… in Trees (2016)

  2. No Access

    Article

    Stable oxygen isotopes (δ 18O) in Austrocedrus chilensis tree rings reflect climate variability in northwestern Patagonia, Argentina

    The stable oxygen isotope (δ 18O) composition of Austrocedrus chilensis (D. Don) Endl. (Cupressaceae) tree rings potentially provide retrospective views of changes in environment and clima...

    F. A. Roig, R. Siegwolf, J. A. Boninsegna in International Journal of Biometeorology (2006)

  3. No Access

    Article

    Seasonal Variations in Soil and Plant Water Status in a Quercus suber L. Stand: Roots as Determinants of Tree Productivity and Survival in the Mediterranean-type Ecosystem

    Studies were conducted to examine changes in soil (Ψs) and plant water status during summer in a 16-year old Quercus suber plantation in southern Portugal. Continuous measurements were conducted between May 2003 ...

    D. O Otieno, C. Kurz-Besson, J. Liu, M. W. T. Schmidt, R. Vale-Lobo do… in Plant and Soil (2006)

  4. No Access

    Article

    Effect of land management on ecosystem carbon fluxes at a subalpine grassland site in the Swiss Alps

    The influence of agricultural management on the CO2 budget of a typical subalpine grassland was investigated at the Swiss CARBOMONT site at Rigi-Seebodenalp (1025 m a.s.l.) in Central Switzerland. Eddy covariance...

    N. Rogiers, W. Eugster, M. Furger, R. Siegwolf in Theoretical and Applied Climatology (2005)

  5. No Access

    Article

    Wood ash treatment affects seasonal N fluctuations in needles of adult Picea abies trees: a 15N-tracer study

    A 15N-tracer experiment was carried out in a stand of adult spruce trees [Picea abies (L.) Karst.] located on the Swiss Plateau in order to investigate the effects of wood ash treatment on seasonal nitrogen fluct...

    M. Jäggi, R. Siegwolf, M. Genenger, D. Hallenbarter, I. Brunner, J. Fuhrer in Trees (2004)

  6. No Access

    Article

    Rapid 15N uptake and metabolism in fine roots of Norway spruce

    Short-term N uptake by Norway spruce roots was investigated after tracer application both in the field and in the laboratory. In the forest the influence of wood ash or liquid fertiliser treatments on the upt...

    M. Genenger, M. Jaeggi, R. Siegwolf, M. Chalot, E. Frossard, I. Brunner in Trees (2003)

  7. No Access

    Article

    The relationship between the stable carbon isotope composition of needle bulk material, starch, and tree rings in Picea abies

    We investigated the relationship between the δ13C signal in current-year and 1-year-old needle bulk material, starch extracts, and early- or late-wood in mature spruce trees (Picea abies) to identify the modifyin...

    M. Jäggi, M. Saurer, J. Fuhrer, R. Siegwolf in Oecologia (2002)

  8. No Access

    Article

    Linking stable oxygen and carbon isotopes with stomatal conductance and photosynthetic capacity: a conceptual model

    Based on measurements of δ18O and δ13C in organic matter of C3-plants, we have developed a conceptual model that gives insight into the relationship between stomatal conductance (g l) and photosynthetic capacity...

    Y. Scheidegger, M. Saurer, M. Bahn, R. Siegwolf in Oecologia (2000)

  9. No Access

    Article

    Simulation of Increased Nitrogen Deposition to a Montane Forest Ecosystem: Partitioning of the Added 15N

    Nitrogen (N) was added over two years to a spruce-dominated (Picea abies) montane forest at Alptal, central Switzerland. A solution of ammonium nitrate (NH4NO2) was frequently sprinkled on the forest floor (1500 ...

    P. Schleppi, L. Bucher-Wallin, R. Siegwolf, M. Saurer… in Water, Air, and Soil Pollution (1999)

  10. No Access

    Article

    Estimating the uptake of traffic-derived NO2 from 15N abundance in Norway spruce needles

    The 15N ratio of nitrogen oxides (NOx) emitted from vehicles, measured in the air adjacent to a highway in the Swiss Middle Land, was very high [δ15N(NO2) = +5.7‰]. This high 15N abundance was used to estimate l...

    M. Ammann, R. Siegwolf, F. Pichlmayer, M. Suter, M. Saurer, C. Brunold in Oecologia (1999)

  11. No Access

    Chapter

    Simulation of Increased Nitrogen Deposition to a Montane Forest Ecosystem: Partitioning of the Added 15N

    Nitrogen (N) was added over two years to a spruce-dominated (Picea abler) montane forest at Alptal, central Switzerland. A solution of ammonium nitrate (NH4NO2) was frequently sprinkled on the forest floor (1500 ...

    P. Schleppi, I. Bucher-Wallin, R. Siegwolf… in Forest Growth Responses to the Pollution C… (1999)

  12. No Access

    Article

    A model of the gas exchange response ofPicea abies to habitat conditions

    Databases describing branch gas exchange ofPicea abies L. at two montane forest sites, Lägeren, Switzerland (National Forschungsprojekt 14 of the Schweizerische Nationalfonds) and Oberwarmensteinach, Germany (Bay...

    E. Falge, W. Graber, R. Siegwolf, J. D. Tenhunen in Trees (1996)

  13. No Access

    Article

    Applying single and two layer canopy models to derive conductances of a Scots pine plantation from micrometeorological measurements

    A single layer (Penman-Monteith) and a two layer (modified Shuttleworth-Wallace) evapotranspiration (ET) model are used alternatively to derive conductances related to the dominant fluxes of water vapor from a...

    Ch. Bernhofer, J. H. Blanford, R. Siegwolf… in Theoretical and Applied Climatology (1996)

  14. No Access

    Article

    Estimates of water vapor flux and canopy conductance of Scots pine at the tree level utilizing different xylem sap flow methods

    During the Hartheim Experiment (HartX) 1992 conducted in the upper Rhine Valley, Germany, three different methods were used to measure sap flow in Scots pine trees via heating of water transported in the xylem...

    B. Köstner, P. Biron, R. Siegwolf, A. Granier in Theoretical and Applied Climatology (1996)

  15. No Access

    Article

    The HartX-synthesis: An experimental approach to water and carbon exchange of a Scots pine plantation

    In May 1992 during the interdisciplinary measurement campaign HartX (Hartheim eXperiment), several independent estimates of stand water vapor flux were compared at a 12-m high Scots pine (Pinus silvestris) planta...

    Ch. Bernhofer, L. W. Gay, A. Granier, U. Joss… in Theoretical and Applied Climatology (1996)