Abstract. Robust reconstruction of past climate and environmental change based on proxy data obtained from natural archives requires an in-depth understanding the processes mechanisms that form determine these proxies. Here we present comprehensive long-term monitoring projects for seasonally laminated (varved) lake sediments tree rings in northern German lowlands. The two sites are located nat...

Tree ring analysis is essential to reveal the environmental information encoded in wood structure. It provides quantitative data on anatomical structure which can be used, for example, measure impact of fluctuating environment tree growth, support global vegetation models and dendrochronological archaeological wooden artefacts. Currently, several imaging-based methods tree-ring detection featur...

Elucidation of the mechanisms involved in long-distance water transport in trees requires knowledge of the water distribution within the sapwood and heartwood of the stem as well as of the earlywood and latewood of an annual ring. X-ray computed tomography is a powerful tool for measuring density distributions and water contents in the xylem with high spatial resolution. Ten- to 20-year-old spr...

Trees can take up and assimilate contaminants from the soil, subsurface, and groundwater. Contaminants in the transpiration stream can become bound or incorporated into the annual rings formed in trees of the temperate zones. The chemical analysis of precisely dated tree rings, called dendrochemistry, can be used to interpret past plant interactions with contaminants. This investigation demonst...

There have been great advances in the field of dendroclimatological research during the past decades. Tree-ring data have been used to derive various climate variables for certain localities and for larger regions. Characteristics of tree-rings provide measurements which can be used as records of climate variability prior to any instrumental weather observations. This is how dendroclimatology c...

We consider ω-automatic structures which are relational structures whose domain and relations are accepted by automata reading ordinal words of length ω for some integer n ≥ 1. We show that all these structures are ω-tree-automatic structures presentable by Muller or Rabin tree automata. We prove that the isomorphism relation for ω-automatic (resp. ω-automatic for n > 2) boolean algebras (respe...

Snow is an important source of freshwater in the Tianshan Mountains Central Asia. This study established 18 tree ring width chronologies and compound analyzed effects snow depth, measured both by remote sensing at meteorological stations, on radial growth spruce trees. The results showed that standard chronology suitable for analysis climatology. correlation coefficient index (RWI) depth was gr...

Trees are sensitive to extreme weather and environmental conditions. This sensitivity is visible in tree-ring widths and cell structure. In our study, we hypothesized that the sudden frost noted at the beginning of May in both 2007 and 2011 affected cambial activity and, consequently, the number and size of vessels in the tree rings. It was decided to test this hypothesis after damage to leaves...

Knowledge about the spatiotemporal tree growth variability and its associations with climate provides key insights into forest dynamics under future scenarios of climate change. We synthesized 17 tree-ring width chronologies from four tree species at the high-elevation sites in the southeast Tibetan Plateau (SETP) to study the regional tree growth variability and climate-growth relationships. D...