نتایج جستجو برای: tree rings
تعداد نتایج: 217757 فیلتر نتایج به سال:
Abstract The boreal forests are widely expanded from subarctic forest to tundra, and taigato forest-steppe zone (from 50 °N 70 °N). We reviewed available stable isotope chronologies in tree-ring cellulose (δ 13 C, δ 18 O 2 H) 16 sites located the Russian Federation; 4 research Fennoscandia (Finland, Sweden Norway); 5 Canada, 1 site Alaska (USA) evaluate impact of climatic changes seasonal annua...
Citation: Julio Camarero J, Gazol A, Sangüesa-Barreda G, Cantero A, Sánchez-Salguero R, Sánchez-Miranda A, Granda E, Serra-Maluquer X and Ibáñez R (2018) Forest Growth Responses to Drought at Shortand Long-Term Scales in Spain: Squeezing the Stress Memory from Tree Rings. Front. Ecol. Evol. 6:9. doi: 10.3389/fevo.2018.00009 Forest Growth Responses to Drought at Shortand Long-Term Scales in Spai...
A tree code method that incorporates a local shearing disc model and fourth-order integration algorithm is applied to the problem of planetary rings, with particular emphasis on the dynamics of Saturn's B ring. The new code, described in detail elsewhere, allows for particle self-gravity, a distribution of particle sizes, and surface friction (particle spin). Important changes made to the origi...
Methods: Cross-sections of 19 remnant pines exhibiting 190 fire scars were collected from a 1.2-km area. Tree-rings and fire scars were precisely dated and analysed for the purpose of characterizing past changes in fire and tree growth. Temporal variability in fire occurrence and seasonality was described for the preand post-European settlement periods. Seasonality of historic fires was determi...
For accurate interpretation of oxygen isotopes in tree rings (δ(18) O), it is necessary to disentangle the mechanisms underlying the variations in the tree's internal water cycle and to understand the transfer of source versus leaf water δ(18) O to phloem sugars and stem wood. We studied the seasonal transfer of oxygen isotopes from precipitation and soil water through the xylem, needles and ph...
Abstract Inter-annual climatically driven growth variability of above-ground biomass compartments (for example, tree stems and foliage) controls the intensity carbon sequestration into forest ecosystems. However, understanding differences between climatic response stem foliage at landscape level is limited. In this study, we examined climate-growth leaf their relationship for Pinus sylvestris (...
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