搜索结果: 1-15 共查到“Quercus”相关记录48条 . 查询时间(0.084 秒)
常绿树。主干优势明显，树皮灰色，尚未开裂。每年抽稍3-4次。叶片革质，上面亮绿或深绿色，下面灰白或浅绿色。叶形多长椭圆形或长矩圆形，叶顶渐尖，叶基半圆或契形。叶缘具均匀排列的粗锯齿5-7对，叶脉6-8对。叶较大，长8-11cm，宽3-4cm，叶形指数2.67（2.26-3.0），叶柄长3-6mm。该品种生长优势显著，6年生米径5.8cm和树高4.3m，分别超过周围5株优势木平均值的33.6%和12...
常绿树，已结实。主干通直，侧枝平展。树皮灰色，尚未开裂。每年抽稍3-4次。叶片革质，上面亮绿色，下面灰白色。叶形倒卵形，叶顶钝圆，叶基契形。叶缘两侧多呈光滑的波状凸起或浅浅的园齿4-6对，叶脉8-10对。叶片较大，长6.5-13cm，宽2.5-5cm，叶形指数2.51（2.24-2.75），叶柄长4-8mm。该品种生长优势显著，6年生米径6.85cm和树高4.7m，分别超过周围5株优势木平均值的1...
中国科学院昆明植物研究所高山植物多样性适应与进化研究组与瑞士巴塞尔大学高山植物进化生物学研究组合作，依托迪庆白马雪山高山冰缘生态系统云南省野外科学观测研究站，对白马雪山海拔4270米处树线交错区内黄背栎（Quercus pannosa）海拔分布上限的形成原因进行了探索。研究发现，黄背栎（Q. pannosa）越冬叶片和叶芽的冬季低温耐受值分别为-32.6 °C和-27.1 °C，是目前已知的耐受低...
The effect of biochar amendment on the growth, morphology and physiology of Quercus castaneifolia seedlings under water-deficit stress
Biomass Chestnut-leaved oak Water deficit Photosynthesis Xylem water potential
2024/2/28
Water stress is one of the most important environmental stresses which can adversely affect soil fertility and plant growth in arid and semiarid regions. In this study, biochar was used as a type of s...
Quantitative and qualitative evaluation of Northern red oak (Quercus rubra L.) in arid areas of North-Western Bohemia
exotic oak domestic oak growth tree quality stand quality health status
2018/3/6
The article analyses growth and quality of Northern red oak (Quercus rubra Linnaeus) based on 13 research plots
(seven in red oak stands and six in sessile oak stands) with the ages between 17 to 159...
Phytoseiid mites on Quercus cerris in an urban park – short communication
Phytoseiidae Acari turkey oak species diversity host plant
2017/6/26
The community of phytoseiid mites on the leaves of non-indigenous Quercus cerris was studied in an intensively managed urban park during the years 2012–2014. Five phytoseiid species, namely Kampimodro...
Assessment of root-shoot ratio biomass and carbon storage of Quercus brantii Lindl. in the central Zagros forests of Iran
carbon sequestration crown diameter component Persian oak growth form
2018/3/6
Assessment of carbon storage build-up in tree stems is a difficult task due to the lack of information on their carbon
sequestration potential and allocation in different components. Similarly, high ...
Variability in leaf and crown morphology correlated with light availability in five natural populations of Quercus castaneifolia C.A. Mey
plasticity Hyrcanian forest controlled conditions leaf mass leaf area leaf area ratio
2018/3/6
In this study, we investigate seedlings of Quercus castaneifolia C.A. Mey, from five different provenances for the research
on leaf and crown morphological variations in relation to a light gradient ...
The root system of pedunculate oak (Quercus robur L.) at the margins of regenerated stands
forest regeneration stand margin edge effect tree morphology mortality microclimate
2017/4/6
The paper aims to contribute to the determination of reasons causing the irregular growth of young pedunculate oaks occurring at the margins of naturally and artificially regenerated plots neighbourin...
Radial evolution of vascular elements in the oak Quercus ilex L. wood
vessel diameter number of vessels early wood latewood evolution
2016/11/11
In order to describe and measure the evolution of vascular elements in time, we examined two groups of samples of the green oak (Quercus ilex Linnaeus) wood. These groups are on the same radial plane ...
Physiological responses of seedlings of different Quercus castaneifolia C.A.Mey.provenances to heterogeneous light environments
peroxidase quantitative activity Hyrcanian forest chlorophyll content
2016/11/11
In this study, five biochemical traits obtained for seedlings of five different provenances of Quercus castaneifolia C.A. Meyer were used to evaluate the available light environment using instantaneou...
Effects of different irradiance levels on peroxidase activities in Quercus castaneifolia C.A.Mey.seedlings from different provenances
Hyrcanian vegetation zone abiotic stress polyacrylamide gel electrophoresis
2016/8/2
To understand the function of peroxidase (POD) in relation to a light gradient, changes in POD activity were studied in five different provenances of chestnut oak seedlings. An experiment was conducte...
Can Evolutionary Theory Explain the Existence of Consciousness? A Review of Humphrey, N. (2010) Soul Dust: The Magic of Consciousness. London: Quercus, ISBN 9781849162371
evolutionary theory, evolution, consciousness illusion Humphrey Darwin Dawkins reproductive fitness science
2015/7/14
This review summarises why it is difficult for Darwinian evolutionary theory to explain the existence and function of consciousness. It then evaluates whether Humphrey's book Soul Dust overcomes these...
Comparison of the bond strength of oak (Quercus L.) and beech (Fagus sylvatica L.) wood glued with different adhesives considering various hydrothermal exposures
adhesion of wood hydrothermal exposure oak beech
2015/5/18
The investigation of the hydrothermal exposure effect on the glue-line strength is obvious when outdoor
application of wood products is in option.
Biomass allocation of chestnut oak (Quercus castaneifolia C.A. Mey) seedlings: effects of provenance and light gradient
leaf to root ratio Hyrcanian forest adaptation
2015/5/5
Patterns of biomass allocation were determined for seedlings of five provenances of Quercus castaneifolia from west to east of the Hyrcanian forest along a rainfall gradient. Experimental design was e...