Search results for "Larch"
showing 6 items of 16 documents
Climate signals in δ13C of wood lignin methoxyl groups from high-elevation larch trees
2016
Abstract In this study, a barely used method to measure δ13C values from lignin methoxyl groups (δ13Cmethoxyl) of tree‐rings is applied to high alpine larch trees to test their potential as a climate proxy. Thirty-seven larch trees (Larix decidua Mill.) were sampled at a tree line site near Simplon Village in the Valais/Switzerland. Samples were used to measure tree-ring width, and from five individuals, δ13Cmethoxyl was determined at annual resolution from 1971 to 2009, and at pentadal resolution from 1747 to 2009. The physiological tree responses to increasing atmospheric CO2 concentration since 1850 and the corresponding decrease in δ13C (Suess effect) were corrected using a range of pub…
Uniform climate sensitivity in tree-ring stable isotopes across species and sites in a mid-latitude temperate forest.
2014
Tree-ring stable isotopes, providing insight into drought-induced eco-physiological mechanisms, are frequently used to reconstruct past changes in growing season temperature and precipitation. Their climatic response is, however, still not fully understood, particularly for data originating from non-extreme, mid-latitude environments with differing ecological conditions. Here, we assess the response of δ(13)C, δ(18)O and tree-ring width (TRW) from a temperate mountain forest in the Austrian pre-Alps to climate and specific drought events. Variations in stem growth and isotopic composition of Norway spruce, common beech and European larch from dry, medium and moist sites are compared with re…
An organisational approach to engineer emergence within holarchies
2010
An open issue in self-organisation is how to engineer emergent behaviours. This issue is also of interest for engineering holonic multi-agent systems as any level of a holarchy is dependant of the emergent behaviours of its sub-levels. In order to tackle this specific feature of holonic multi-agent systems, the capacity concept which abstracts a know-how from its concrete realisation is introduced. The use of this concept is illustrated in this paper through a case study using the ASPECS development process which enables the analysis, design, implementation and deployment of holonic multi-agent systems and integrates the capacity as a core concept of it is underlying metamodel, called capac…
Reassessing the evidence for tree-growth and inferred temperature change during the Common Era in Yamalia, northwest Siberia
2013
AbstractThe development of research into the history of tree growth and inferred summer temperature changes in Yamalia spanning the last 2000 years is reviewed. One focus is the evolving production of tree-ring width (TRW) and tree-ring maximum-latewood density (MXD) larch (Larix sibirica) chronologies, incorporating different applications of Regional Curve Standardisation (RCS). Another focus is the comparison of independent data representing past tree growth in adjacent Yamalia areas: Yamal and Polar Urals, and the examination of the evidence for common growth behaviour at different timescales. The sample data we use are far more numerous and cover a longer time-span at Yamal compared to …
La pancarte de Saint-Mathurin de Larchant (vers 1075 ?)
2006
Les Archives nationales conservent sous la cote K20 n° 5/9 un grand parchemin relatif a la paroisse Saint-Mathurin de Larchant (dep. Seine-et-Marne, arr. Fontainebleau). Dodo, pretre de cette paroisse, affirme etre le redacteur de ce document hybride reunissant une Vita abregee du saint patron Mathurin et une liste de donations foncieres faites a son eglise. Ce document complexe, sans datation, ni souscription, ni sceau, permet d'apprehender les rapports difficiles d'un pretre a l'ecrit, au latin et aux sources. Ce pretre a realise finalement une piece diplomatique impressionnante qui n'est pas sans rappeler les grandes pancartes recapitulatives, mais aussi certains brefs et cartulaires. La…
Differenzierung zwischen prämaturer Thelarche und Pubertas praecox anhand klinischer, hormoneller und radiologischer Befunde
2008
In a retrospective study of 39 girls (aged 10 months to 7 10/12 years) with premature breast development criteria for distinguishing between premature thelarche and precocious puberty were analysed. Serum estradiol levels and bone age were determined and a test with luteinizing hormone-releasing hormone (LHRH) performed (inclusion criteria). On the basis of the LHRH test and bone age, premature thelarche was diagnosed in 29 patients and precocious puberty in ten: while those with premature thelarche had a follicle-stimulating hormone (FSH) pattern of rise, in those with precocious puberty the rise in gonadotropin was of the LH type. The LH/FSH ratio 30 min after stimulation was 1 (median 2.…