نتایج جستجو برای: growth ring

تعداد نتایج: 935676  

Journal: :Russian Journal of Ecology 2021

Recent climatic changes significantly affected forest ecosystems in northern Eurasia. Trees growing Siberia are very sensitive to climate change due strong temperature limitation of their growth. Our study covers high-latitude (northeastern Yakutia, eastern Taimyr, central Evenkia) and high-altitude (Russian Altai) zones Eurasia, where tree-ring parameters (tree-ring width, cell-wall thickness,...

Journal: :Forest Systems 2021

Aim of study: To determine the response high-altitudinal forests to seasonal drought.Area Monte Tláloc, Estado de México and Rancho Joyas del Durazno, Municipality Río Verde, San Luis Potosí, México.Materials methods: In this study, we evaluate drought hydroclimate in two young Mexican conifers sampled at high elevation, correlating records tree-ring growth Normalized Difference Vegetation Inde...

2006
Samuli Helama Taneli Kolström Heli Peltola Jouko Meriläinen

A collection of subfossil wood of Pinus sylvestris (Scots pine) was exposed to X-ray densitometry. The collection of 64 samples from the southern boreal forest zone was dendrochronologically cross-dated to A.D. 673-1788. Growth characteristics were determined by performing density profiles including the following parameters: minimum density, earlywood and latewood boundary density, maximum dens...

2014
SASKIA L. VAN DE GEVEL JUSTIN L. HART HENRI D. GRISSINO-MAYER KENNETHW. ROBINSON

On 26 May 2003, intense rainfall from a series of thunderstorms in eastern North Carolina caused flooding that eventually destroyed the concrete dam in Hope Mills, draining Hope Mills Lake, and revealing a formerly submerged and buried structure that was identified as a timber crib dam. Inspection revealed these logs to be old-growth longleaf pines, which are now rare on the coastal plain lands...

2014
Bjorn M. M. Boysen Michael N. Evans Patrick J. Baker

Long-lived trees from tropical Australasia are a potential source of information about internal variability of the El Niño-Southern Oscillation (ENSO), because they occur in a region where precipitation variability is closely associated with ENSO activity. We measured tree-ring width and oxygen isotopic composition (δ18O) of α-cellulose from Agathis robusta (Queensland Kauri) samples collected ...

2014
Hiroshi Wada Chisato Masumoto-Kubo Yousef Gholipour Hiroshi Nonami Fukuyo Tanaka Rosa Erra-Balsells Koichi Tsutsumi Kenzo Hiraoka Satoshi Morita Tai Wang

Foehn-like extreme hot and dry wind conditions (34°C, >2.5 kPa vapor pressure deficit, and 7 m s(-1)) strongly affect grain quality in rice (Oryza sativa L.). This is a current concern because of the increasing frequency and intensity of combined heat and water-deficit stress under climate change. Foehn-induced dry wind conditions during the grain-filling stage increase ring-shaped chalkiness a...

For a ring endomorphism $alpha$ and an $alpha$-derivation $delta$, we introduce a concept, so called skew $pi$-Armendariz ring, that is a generalization of both $pi$-Armendariz rings, and $(alpha,delta)$-compatible skew Armendariz rings. We first observe the basic properties of skew $pi$-Armendariz rings, and extend the class of skew $pi$-Armendariz rings through various ring extensions. We nex...

2008
Daniel G. Gavin Brian Beckage Benjamin Osborne

Montane forests in the northeastern United States have experienced symptoms of declining vigor, such as branch dieback and increased mortality, over the last half-century. These declines have been attributed to the cumulative impacts of acid deposition, but reconstructing these declines from tree-ring records has proved difficult because of confounding factors that affect low-frequency growth p...

Journal: :EURASIP J. Adv. Sig. Proc. 2002
Anne Guillaud Hervé Troadec Abdessalam Benzinou Jean Le Bihan Vincent Rodin

We present an algorithm for fish otolith growth ring detection using a multiagent system. Up to now, the identification of growth rings, for age estimation, is routinely achieved by human readers, but this task is tedious and depends on the reader subjectivity. One of the major problems encountered during an automatic contour detection is the lack of ring continuity perception. We present an ap...

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