نتایج جستجو برای: durmast oak

تعداد نتایج: 9469  

Journal: رستنیها 2018
Amin Alidadi Mohammad Javan-Nikkhah Mojegan Kowsari Morteza Ebrahimi Rastaghi Saadi Karami

Zagros vegetation zone is one of the most important forest regions in Iran, which consists of a diverse group of arboreal species, especially oaks (Quercus spp.). Ilam province located in west of Iran and in Zagros vegetation zone which has 641000 ha of oak forests that its dominant species is Persian oak (Q. brantii). Oak trees decline is a complicated phenomenon that may result from different...

Journal: :Tree physiology 2008
James D Lewis Jeff Licitra Amy R Tuininga Abby Sirulnik Gregory D Turner Jacqui Johnson

Invasive, non-indigenous, phytophagous insects have caused widespread declines in several dominant tree species. The decline in dominant tree species may lead to cascading effects on other tree and microbial species and their interactions, affecting forest recovery following the decline. In the eastern USA, eastern hemlock (Tsuga canadensis (L.) Carr) is declining because of infestation by the ...

2015
Zhaofei Fan Qi Yao Daniel Dey Martin Spetich Andrew Ezell Stephen Shifley John Kabrick Randy Jensen

Oak regeneration problems have been noted in the Missouri Ozarks and elsewhere in the eastern United States. Alteration of disturbance regimes, competition from nonoak species, and high overstory stocking are believed to be major barriers that impede oak regeneration. We studied regeneration in upland oak forests that were harvested by both even-aged (clearcutting) and uneven-aged (single-tree ...

2012
Ki-Ho Moon

INTRODUCTION Radiographic pathology of severe osteoarthritis of the knee (OAK) such as severe osteophyte at tibial spine (TS), compartment narrowing, marginal osteophyte, and subchondral sclerosis is well known. Kellgren-Lawrence grading system, which is widely used to diagnose OAK, describes narrowing-marginal osteophyte in 4-grades but uses osteophyte at TS only as evidence of OAK without det...

2014
Hengfu Yin Chun Ju Chen Jun Yang David J. Weston Jin-Gui Chen Wellington Muchero Ning Ye Timothy J. Tschaplinski Stan D. Wullschleger Zong-Ming Cheng Gerald A. Tuskan Xiaohan Yang

Hengfu Yin, Chun Ju Chen, Jun Yang, David J. Weston, Jin-Gui Chen, Wellington Muchero, Ning Ye, Timothy J. Tschaplinski, Stan D. Wullschleger, Zong-Ming (Max) Cheng, Gerald A. Tuskan, and Xiaohan Yang 1Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 2BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3Environmental Scien...

Journal: :تولیدات دامی 0
ساحره غریبی دانشجوی کارشناسی ارشد، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه یاسوج، یاسوج، ایران محمد هوشمند استادیار گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه یاسوج، یاسوج، ایران رضا نقی ها استادیار گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه یاسوج، یاسوج، ایران

this study was conducted to investigate the influences of raw or acetic acid-treated oak acornon the performance and cecal flora of broiler chickens. a total of 340 one-day-old male and female cobb 500 broiler chicks were used in a completely randomized design consisting of five treatments with four replicates and 17 chicks each. first group was fed with a corn-based diet (without oak acorn) as...

2002
Richard S. Dodd Nasser Kashani Zara Afzal-Rafii

The black oaks of California include 4 tree species (California black oak, coast live oak, Shreve oak, interior live oak) that are known to hybridize. Complex patterns of population variation within each species are likely to result from these hybrid combinations and from subsequent introgressions. We have been studying population variation using biochemical and molecular markers and report res...

2008
Zhaofei Fan John M. Kabrick Stephen R. Shifley

Oak decline and related mortality have periodically plagued upland oak-hickory forests, particularly oak species in the red oak group, across the Ozark Highlands of Missouri, Arkansas and Oklahoma since the late 1970s. Advanced tree age and periodic drought, as well as Armillaria root fungi and oak borer attack are believed to contribute to oak decline and mortality. Declining trees first show ...

Determination of soil chemical properties variability that affected tree tolerance to stresses can help to manage this environmental phenomenon. In this investigation, for detection of this variation trend, area of affected decline oak trees divided to four groups of control (without Oak decline), slight, middle and severe Oak decline based on tree and branch number per soil surface unit. In ea...

2014
Daniel C. Dey

Oak cover types comprise half of the forestlands in the eastern United States. There is a great desire to sustain these highly valued forests. Unfortunately, reports of the successional replacement of oak are all too common, as they are throughout the world. Sustaining the oak resource requires the ability to both regenerate and recruit oak into the overstory as dominant mature trees. Too often...

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