A5014132171- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Forest ecology and management
- Ecology and Vegetation Dynamics Studies
- Horticultural and Viticultural Research
- Tree Root and Stability Studies
- Ecology and Conservation Studies
- Plant and animal studies
- Seedling growth and survival studies
- Agriculture, Soil, Plant Science
- Plant tissue culture and regeneration
- Turfgrass Adaptation and Management
- Plant and Biological Electrophysiology Studies
- Seed Germination and Physiology
- Plant Stress Responses and Tolerance
- Plant Molecular Biology Research
- Photosynthetic Processes and Mechanisms
- Plant Pathogens and Fungal Diseases
- Manufacturing Process and Optimization
- Plant and Fungal Interactions Research
- Plant Disease Resistance and Genetics
- Plant responses to elevated CO2
- Plant Reproductive Biology
- Plant responses to water stress
Ehime University
2014-2024
Tokyo University of Agriculture and Technology
2007-2018
Hokkaido University
2001-2010
National Institute of Technology, Tomakomai College
2001-2008
The networks of vessel elements play a vital role in the transport water from roots to leaves, and continuous formation earlywood vessels is crucial for growth ring-porous hardwoods. differentiation controlled by external internal factors. present study was designed identify limiting factors induction cambial reactivation vessels, using localized heating disbudding dormant stems seedlings deciduous hardwood, Quercus serrata. Localized achieved wrapping an electric ribbon around stems....
Understanding seasonal changes in photosynthetic characteristics of canopy leaves is indispensable for modeling the carbon balance forests. We studied gas exchange that are related to temperature dependence photosynthesis Quercus crispula Blume, one most abundant species cool-temperate forests Japan. Photosynthetic rate and ribulose-1,5-bisphosphate (RuBP) carboxylation capacity (Vcmax) at 20 °C increased from June August then decreased September. The activation energy Vcmax, a measure was...
Background and Aims In temperate regions, trees undergo annual cycles of cambial growth, with periods activity dormancy. Environmental factors might regulate the as well development derivatives. We investigated effects low temperature by localized cooling on latewood formation in two conifers, Chamaecyparis obtusa Cryptomeria japonica. Methods A plastic rubber tube that contained cooled water was wrapped around a 30-cm-wide portion main stem japonica during seasons active cambium. Small...
Leaf photosynthetic and post-photosynthetic processes modulate the isotope ratios of tree-ring cellulose. Post-photosynthetic processes, such as remobilization stored starch in early spring, are important to understanding mechanisms xylem formation tree stems; however, untangling ratio signals imprinted on rings is difficult. Portions carbon-bound hydrogen oxygen atoms exchanged with medium water during processes. We investigated δD δ18O values cellulose using Quercus crispula Blume trees...
Differences in leaf size are expected to be coordinated with various shoot traits and branching intensity because these relationships will influence light capture efficiency, water use, biomechanics. Previous studies have mainly focused on interspecific patterns of trait relationships, but not intraspecific at the geographic scale. We investigated variation Fagus crenata Japan.Allometric between current-year shoots per branch unit 1-m length main axis (BI) its coordination latitude were...
We examined open-grown Acer mono Maxim. trees of different sizes to test the hypotheses that (1) hydraulic limitation increases with tree size, thereby reducing photosynthesis, and (2) photosynthetic water- nitrogen-use efficiencies change size. Maximum net assimilation rate per unit dry mass was significantly lower in large than small trees, whereas leaf nitrogen concentration increased As a consequence, efficiency decreased increase Photosynthetic water-use efficiency, however, partly as...
Morphology of crown shoots changes with tree height. The height forest trees is usually correlated the light environment and this makes it difficult to separate effects size conditions on morphological plasticity shoots. This paper addresses tree-height dependence shoot traits under full-light where a not shaded by other crowns. Focus given relationships between top-shoot traits, which include shoot's leaf-blades non-leafy mass, its total leaf-blade area length basal diameter stem. We...
Within a canopy, spatial variation in leaf traits may be determined by light and nutrient availabilities. Such environmentally caused changes an important cause of palatability to herbivores. We conducted factorial experiment with fertilization selective cutting northern Japanese forest dominated oak ( Quercus crispula Blume). Fertilization increased the nitrogen content upper canopy leaves. Leaf mass per area (LMA) was greater than lower canopy. Selective all interactions had significant...
Success of clonal tree plantations depends on genotype as well phenotypic plasticity, which determines acclimation potential individual trees to different environmental conditions. Short-term genotypes local growing conditions can be tested using trials, but stand productivity and yield the ability acclimate long-term variation. In Japan, Cryptomeria japonica (Thunb. ex L. f.) D. Don are common many elite clones have been developed. We evaluated growth C. in 45-year-old trials taking into...
This study investigated the composition, age- and size-structure, tree-ring relationships for an old-growth, warm-temperate, mixed-evergreen forest at University of Tokyo Chiba Forest, Japan. A total 32 tree species were recorded, which was dominated by Abies firma Quercus acuta. Tsuga sieboldii recruitment after 1850, followed firma. After 1920, many individuals Castanopsis, Cinnamomum, Cleyera became established. The temporal pattern conifer did not correspond to record strong wind events....
Cryptomeria japonica (Thunb. ex L. f.) D. Don is the most major plantation species in Japan, and cultivars have been developed planted under variable environmental conditions across country. Productivity of clonal plantations influenced by ability genotype to acclimate edaphic- geographic-scale variation disturbance regimes. Because all individuals are genetically identical a plantation, trait differences among represent phenotypic plasticity. Here, we investigated how plasticity response...
樹高成長は, 樹種や立地条件に依存して変化し, ある高さ以上になると停止する。決定された最大樹高は, 光をめぐる資源獲得競争での優位性や群落の階層構造の発達, 森林の生産性を規定する要因として重要である。近年, 樹冠へアクセスするシステムや技術が発達し, 数十メートルにも及ぶ高木の樹冠における生理学的測定が可能となった。その結果, 土壌からの水輸送の限界による個葉光合成速度の低下や, 重力による水ポテンシャルの低下によるシュートや葉における細胞の伸長抑制などといった生理学的要因によって樹高成長が制限される可能性が示された。また理論研究や操作実験などから, 自重や風圧に対する力学的支持機能や老化による遺伝的な変化に関しては, 樹高成長の制限要因としての寄与は低いことが示唆されている。今後は樹高成長制限が天然林での遷移過程や個体間の相互作用, 群落の発達機構などにどのように影響しているかを明らかにすることで, 樹高成長の包括的な理解と森林の生産性予測などへの応用が可能になると考えられる。