326 research outputs found
On the description of nature and the feeling of Kaoru, the hero in the Tale of Genji, to Uji
No full text源氏物語の宇治の自然描写は、登場人物の心情と関連している。都と宇治の環境の違い、宇治の姉妹との人間関係、描写される音楽から、薫の精神的探求を述べる。The author researches a visit made by Kaoru, the hero in the Tale of Genji, to Uji, a suburb of Kyoto. This paper analyses; 1) the differences in the atmosphere of Uji and Kyoto. 2) the interaction between Kaoru and the beautiful sisters he meets when hearing heavenly music, and 3) the effect of this encounter on the mind of the hero himself
The importance of cotyledon functional morphology and patterns of seed reserve utilization for the physiological ecology of neotropical tree seedlings
No full textSeed mass, resource makeup of seed, and functional morphology of cotyledons are three traits that together determine patterns of seed reserve utilization by seedlings during their critical establishment stage. The main objective of this thesis is to examine how these traits differentiate the patterns of seedling growth among tree species found in the tropical moist forest on Barro Colorado Island, Panama. Among epigeal phanerocotylar species, photosynthetic capacity per unit cotyledon mass is linearly related to the reciprocal of cotyledon thickness. The relative balance of the dual functions of cotyledons, export of seed reserves vs. photosynthesis, can be estimated by whether cotyledons are free of the seed coat and how thick they are. The larger the cotyledon photosynthetic capacity of a species, the earlier its seedling growth starts to depend on the external light availability. Overall, species with smaller seeds develop cotyledons with a larger photosynthetic capacity. Concentrations of energy and nitrogen reserves in seeds vary up to three fold among species and are independent of total seed mass or cotyledon functional morphology. Species with higher energy concentration in seeds transform a unit of seed mass into greater seedling mass during the initial development in shade, while species with higher nitrogen concentration in seeds depend exclusively on seed nitrogen reserves for a longer period. In all species, dependency on external sources starts earlier for energy (7-16 d) than for nitrogen (14-40 d). Almost all species exhibit phenotypic plasticity in leaf photosynthetic capacity, leaf thickness, and allocation patterns in response to light environment. In both sun and shade, more light-demanding species have higher relative growth than shade-tolerant species, enabled by their photosynthetic cotyledons, high specific leaf area, and high leaf area ratio. Species with semi-photosynthetic storage cotyledons have as low relative growth rates as those with solely storage cotyledons in shade; however, their growth rate is more responsive to light availability. These seed and seedling traits may be under selective pressure to segregate species regeneration niches in the tropical forest community.Made available in DSpace on 2011-05-07T13:27:30Z (GMT). No. of bitstreams: 2
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Global convergence in leaf respiration from estimates of thermal acclimation across time and space
No full textRecent compilations of experimental and observational data have documented global temperature-dependent patterns of variation in leaf dark respiration (R), but it remains unclear whether local adjustments in respiration over time (through thermal acclimation) are consistent with the patterns in R found across geographical temperature gradients.
We integrated results from two global empirical syntheses into a simple temperature-dependent respiration framework to compare the measured effects of respiration acclimation-over-time and variation-across-space to one another, and to a null model in which acclimation is ignored. Using these models, we projected the influence of thermal acclimation on: seasonal variation in R; spatial variation in mean annual R across a global temperature gradient; and future increases in R under climate change.
The measured strength of acclimation-over-time produces differences in annual R across spatial temperature gradients that agree well with global variation-across-space. Our models further project that acclimation effects could potentially halve increases in R (compared with the null model) as the climate warms over the 21st Century.
Convergence in global temperature-dependent patterns of R indicates that physiological adjustments arising from thermal acclimation are capable of explaining observed variation in leaf respiration at ambient growth temperatures across the globe.Vanderwel, Mark C; Slot, Martijn; Lichstein, Jeremy W; Reich, Peter B; Kattge, Jens; Atkin, Owen K; Bloomfield, Keith J; Tjoelker, Mark G; Kitajima, Kaoru. (2015). Global convergence in leaf respiration from estimates of thermal acclimation across time and space. Retrieved from the University Digital Conservancy, 10.1111/nph.13417
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No full text京都大学0048新制・課程博士医学博士甲第1642号医博第474号新制||医||201(附属図書館)4392UT51-50-G185京都大学大学院医学研究科生理系専攻(主査)教授 早石 修, 教授 村地 孝, 教授 沼 正作学位規則第5条第1項該当Kyoto UniversityDA
Tissue‐level leaf toughness, but not lamina thickness, predicts sapling leaf lifespan and shade tolerance of tropical tree species
No full text
Whole-plant respiration and its temperature sensitivity during progressive carbon starvation
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