نتایج جستجو برای: climatic stem

تعداد نتایج: 308452  

Journal: : 2021

?he results of identifying the causes mass drying pine trees in Belarusian Polesje are presented. The object study is its modern generations on former depleted sandy arable land and natural conditions growth. It revealed that groundwater reduction after drainage reclamation climatic conditions, increase inflow direct solar radiation 21st century was limiting factor for suppression stem producti...

2016
Valentine Herrmann Sean M McMahon Matteo Detto James A Lutz Stuart J Davies Chia-Hao Chang-Yang Kristina J Anderson-Teixeira

Stem diameter is one of the most commonly measured attributes of trees, forming the foundation of forest censuses and monitoring. Changes in tree stem circumference include both irreversible woody stem growth and reversible circumference changes related to water status, yet these fine-scale dynamics are rarely leveraged to understand forest ecophysiology and typically ignored in plot- or stand-...

Journal: :Annals of botany 2004
Laura Llorens Josep Peñuelas Marc Estiarte Paula Bruna

BACKGROUND AND AIMS Climate projections predict drier and warmer conditions in the Mediterranean basin in the next decades. The possibility of such climatic changes modifying the growth of two Mediterranean species, Erica multiflora and Globularia alypum, which are common components of Mediterranean shrublands, was assessed. METHODS A field experiment was performed from March 1999 to March 20...

Journal: :Tree physiology 2012
Julia A Sohn Martin Kohler Arthur Gessler Jürgen Bauhus

Radial stem growth and the isotopic composition of growth rings are commonly used to quantify the effects of droughts on trees. However, often these parameters are quantified only at one stem height, e.g., 1.3 m, and it is not known how representative this is for the whole stem. This study investigated radial growth at four stem heights (1.3, 5.5, 9.8 and 14 m) of 21, and wood Δ(13)C and δ(18)O...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده کشاورزی 1391

چکیده سیب درختی (malus domestica borkh) متعلق به خانواده rosaceae از میوه های مهم و اقتصادی مناطق معتدله و سردسیری ایران است. ویروس ساقه شیاری سیب apple stem grooving virus (asgv) عضو تیپ جنس capillovirus و ویروس ساقه آبله ای سیب apple stem pitting virus (aspv) عضو تیپ جنس foveavirus متعلق به خانوادهbetaflexiviridae ، از مهمترین ویروس های بیماری زای سیب محسوب می شوند. آلودگی این دو ویروس درس...

2015
Moumita Saha Pabitra Mitra

Identification of climatic indices are vital in essence of their ability to characterize different climatic events. We focus on discovery of climatic indices important for Indian summer monsoon from climatic parameters surface pressure and zonal wind velocity. We use climatic network based community detection approach for discovery of climatic indices. New indices depict better correlation with...

2016
Malcolm S. Itter Andrew O. Finley Anthony W. D'Amato Jane R. Foster John B. Bradford

1 Abstract Changes in the frequency, duration, and severity of climate extremes are forecast to occur under global climate change. The impacts of climate extremes on forest productivity and health are complicated by potential interactions with disturbance events and forest stand dynamics. Such interactions may lead to non-linear forest growth responses to climate and disturbance involving thres...

2015
Bastien Mennecart

The Earth already experienced numerous episodes of global warming and cooling. One of the latest impressive events of temperature rising was the Late Oligocene Warming that occurred around 25 Mya. An increase of the marine temperature of 2 to 4°C has been observed in a short time interval. In Europe, this major climatic event can be correlated to the continental faunal turnover "Microbunodon Ev...

1994
S. R. Hare

Alaskan salmon stocks have exhibited enormous fluctuations in production during the 20th century. In this paper, we investigate our hypothesis that large-scale salmon-production variability is driven by climatic processes in the Northeast Pacific Ocean. Using a time-series analytical technique known as intervention analysis, we demonstrate that Alaskan salmonids alternate between high and low p...

Journal: :Evolution; international journal of organic evolution 2012
M Caitlin Fisher-Reid Kenneth H Kozak John J Wiens

The rate of climatic-niche evolution is important to many research areas in ecology, evolution, and conservation biology, including responses of species to global climate change, spread of invasive species, speciation, biogeography, and patterns of species richness. Previous studies have implied that clades with higher rates of climatic-niche evolution among species should have species with nar...

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