Noriyuki Osada

Noriyuki Osada
Meijo University · Faculty of Agriculture

PhD

About

57
Publications
37,043
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10,533
Citations
Citations since 2016
15 Research Items
6595 Citations
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201620172018201920202021202202004006008001,0001,200
201620172018201920202021202202004006008001,0001,200
201620172018201920202021202202004006008001,0001,200

Publications

Publications (57)
Article
1.Leaf lifespan (LLS) has been intensively studied as a key functional trait, and it is thought to have evolved and acclimates so as to optimize carbon balance or nitrogen use. However, empirical studies have produced inconsistent results in support of the theoretical predictions of optimal LLS.2.How rapidly daily carbon gain declines with leaf age...
Article
Full-text available
The theory of optimal leaf N distribution predicts that the C gain of plants is maximized when the N content per unit area (N area) scales with light availability, but most previous studies have demonstrated that the N distribution is not proportional to light availability. In tall trees, the leaves are often clustered on twigs (leaf cluster) and n...
Article
Full-text available
The effects of tree height on shoot traits may in some cases differ in magnitude and direction from the effects of light. Nevertheless, general patterns of change in shoot traits in relation to variations in height and light have not so far been revealed. A comprehensive analysis of the differences between the effects of height and light on a range...
Article
1. Tree allometry often varies among coexisting species of different maximum height (Hmax) in forests. Although shoot growth patterns directly influence overall tree architecture, the structures of current-year shoots at the tops of crowns have not been directly related to differences in tree allometry across species. 2. I investigated height-depen...
Article
Predation risk has a great influence on animal behaviour. Juveniles are often more susceptible to predation than adults owing to their small body size and limited locomotive ability. Ezohelix gainesi (Camaenidae) is a ground-dwelling land snail that swings its shell as a strategy to avoid predation by beetles. This strategy, however, does not seem...
Article
Full-text available
Between-branch nitrogen competition is expected to be important during spring in temperate deciduous trees as nitrogen allocation would be higher in branches from earlier budburst than in those from later budburst. Such phenology-induced branch interaction would influence plant photosynthesis, but this has not been evaluated. Warming experiments we...
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The generality of scaling relationships between multiple shoot traits, known as Corner's rules, has been considered to reflect the biomechanical limits to trees and tree organs among the species of different leaf sizes. Variation in fruit size within species would also be expected to affect shoot structure by changing the mechanical and hydraulic s...
Article
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Spring leaf phenology has been intensively studied in temperate deciduous broad-leaved tree species, but the phenology of evergreen broad-leaved tree species has seldom been focused on. Evaluation of the difference in spring leaf phenology between coexisting deciduous and evergreen species is essential to predict their responses to climate change....
Article
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Urbanization generally reduces wildlife populations. Individual species responses, however, are often highly variable, and such variability can be explained by differences in species ecological traits. To examine this hypothesis, we focused on two co-occurring land snails, Ezohelix gainesi and Euhadra brandtii sapporo; the former is ground-dwelling...
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The original version of the article unfortunately contained mistakes in the legends of Fig. 3. The legends (1) Blue square: Euhadra brandtii sapporo, ground is changed to Blue square: Euhadra brandtii sapporo, canopy (2) Red circle: Euhadra brandtii sapporo, canopy is changed to Red circle: Euhadra brandtii sapporo, ground.
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Abstract Meta‐analysis plays a crucial role in syntheses of quantitative evidence in ecology and biodiversity conservation. The reliability of estimates in meta‐analyses strongly depends on unbiased sampling of primary studies. Although earlier studies have explored potential biases in ecological meta‐analyses, biases in reported statistical result...
Article
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Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research sp...
Article
Spring leaf phenology strongly influences plant productivity in temperate deciduous forests. Many studies have detected earlier budburst and leaf maturation in smaller trees within species, and have discussed the adaptive significance of increasing carbon gain before canopy closure in small trees. However, some previous studies have found the oppos...
Article
Full-text available
Climate change is expected to influence plant productivity particularly through changes in the timing of budburst. Nonetheless, knowledge about the intraspecific variation of the timing of budburst and its relationship with climate is insufficient for most tree species. Based on the common garden experiments of Fagus crenata, we investigated the in...
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Coexistence of multiple species is a fundamental aspect of plant and forest ecology. Although spatial arrangement of leaves within crowns is an important determinant of light interception and productivity, shoot structure varies considerably among coexisting canopy species. We investigated the relative importance of structural traits in determining...
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Arboreality has evolved in a wide range of taxa, but its adaptive significance has rarely been examined in natural ecosystems. Euhadra brandtii sapporo is an arboreal land snail distributed in a restricted area of Hokkaido, Japan. We hypothesized that arboreality provides the species with significant survival advantages, which we tested via field o...
Article
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Premise of the study: Timing of budburst (DBB) may be related to the functional traits and distributions of woody species in temperate regions. Although many previous studies have investigated DBB in a number of temperate species, it has seldom been linked to multiple plant trait relationships. Methods: DBB and plant traits were investigated for...
Article
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Premise of the study: Leaf life span (LLS) has long been hypothesized to plastically increase with decreasing nitrogen (N) supply from soil to maximize N retention, carbon assimilation, and fitness; however, accumulating evidence shows no consistent trend. The apparent inconsistencies are explained by a recent model that assumes LLS has a hump-sha...
Article
• 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, and biomechanics. Previous studies have mainly focused on interspecific patterns of these trait relationships, but not on intraspecific patterns at the geographic...
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Full-text available
Understanding how plants are constructed—i.e., how key size dimensions and the amount of mass invested in different tissues varies among individuals—is essential for modeling plant growth, carbon stocks, and energy fluxes in the terrestrial biosphere. Allocation patterns can differ through ontogeny, but also among coexisting species and among speci...
Article
Full-text available
Understanding how plants are constructed—i.e., how key size dimensions and the amount of mass invested in different tissues varies among individuals—is essential for modeling plant growth, carbon stocks, and energy fluxes in the terrestrial biosphere. Allocation patterns can differ through ontogeny, but also among coexisting species and among speci...
Article
Full-text available
Understanding how plants are constructed; i.e., how key size dimensions and the amount of mass invested in different tissues varies among individuals; is essential for modeling plant growth, estimating carbon stocks, and mapping energy fluxes in the terrestrial biosphere. Allocation patterns can differ through ontogeny, but also among coexisting sp...
Article
Full-text available
Many terrestrial plants are C3 plants that evolved in the Mesozoic Era when atmospheric CO2 concentrations ([CO2]) were high. Given current conditions, C3 plants can no longer benefit from high ambient [CO2]. Kaempferia marginata Carey is a unique understory ginger plant in the tropical dry forests of Thailand. The plant has two large flat leaves t...
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The theory of optimal nitrogen (N) distribution predicts that the carbon gain of plants will be maximised when leaves of higher irradiance have higher N content per area (N area). Most previous studies have examined optimal N distribution without explicitly considering the branching status of plants. I investigated light environment, N distribution...
Article
Continuous leaf phenology, with sequential production of metamers, is usually found in pioneer species, but is rare in shade-tolerant species. Because of the nature of 'continuous' growth, continuous phenology has seldom been related to meteorological factors. We studied the leaf demography of seedlings and tall trees of a shade-tolerant emergent s...
Conference Paper
Background/Question/Methods Increasing nitrogen (N) deposition changes the biogeochemical cycling in forest ecosystems where plant growth is limited by N availability. N cycling in soil may also change by an increase in N deposition, i.e., available N form for plants in soil will be dominated by nitrate (NO3-) with increasing N deposition, becaus...
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Crown exposure to light (CE) and tree allometry were investigated for 11 species in a snowy cool-temperate secondary forest dominated by Fagus crenata and Betula ermanii in Japan. The 11 species differentiated horizontal and vertical light gradients for regeneration. CE was highly variable across species in small trees, but variation in CE decrease...
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To investigate the relative importance of pollinators and flower bud herbivores on final fruit set, the ratios of flower to flower bud (flower/bud), fruit to flower (fruit/flower), and fruit to flower bud (fruit/bud) were examined for the two bumble-bee-pollinated ericaceous species that have different flowering seasons: Pieris japonica (Thunb.) D....
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Crown architecture and biomass distribution patterns were investigated in relation to branching and tree size in a pioneer species, Rhus trichocarpa Miq. (Anacardiaceae), in a Japanese secondary forest. Crown architecture changed with tree size and with branching. Crown depth and area were greater in taller trees. In addition, branched trees had cr...
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Long-term exposure to elevated CO2 concentration will affect the traits of wild plants in association with other environmental factors. We investigated multiple effects of atmospheric CO2 concentration, irradiance, and soil N availability on the leaf photosynthetic traits of a herbaceous species, Polygonum sachalinense, growing around natural CO2 s...
Article
Based on an allometric reconstruction, the structure and biomass-allocation patterns of branches and current-year shoots were investigated in branches of various heights in the pioneer tree Rhus trichocarpa, to evaluate how crown development is achieved and limited in association with height. Path analysis was conducted to explore the effects of li...
Article
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In aseasonal tropics, timing of leaf emergence and leaf fall may differ between the shoots of different crown parts within a tree. This is important for the efficient development of crowns because leaves should be produced as soon as enough carbohydrates are accumulated. This hypothesis was tested by investigating leaf demography over a 44-mo perio...
Article
Global-scale quantification of relationships between plant traits gives insight into the evolution of the world's vegetation, and is crucial for parameterizing vegetation-climate models. A database was compiled, comprising data for hundreds to thousands of species for the core 'leaf economics' traits leaf lifespan, leaf mass per area, photosyntheti...
Article
The nitrogen source utilization by Fagus crenata distributed on soils with different forms of inorganic nitrogen in a cool-temperate deciduous forest in central Japan was determined by measuring foliar δ 15N. Two soil habitat types along a slope were delineated based on nitrogen transformation patterns, i.e., soils with high net nitrification rates...
Article
ABSTRACT Aim Our aim was to quantify climatic influences on key leaf traits and relationships at the global scale. This knowledge provides insight into how plants have adapted to different environmental pressures, and will lead to better calibration of future vegetation–climate models. Location The data set represents vegetation from 175 sites arou...
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The fruiting phenology and fruit removal patterns of Rhus trichocarpa Miq. (Anacardiaceae) were investigated in a warm-temperate secondary forest in Japan. Mature fruits of this species are dispersed by birds. Effects of fruit display size and canopy openness on fruit removal were investigated in years with different fruit densities (i.e., masting...
Article
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The relative effects of light and tree height on the architecture of leader crowns (i.e., the leading section of the main trunk, 100 cm in length) and current-year shoots for a canopy species, Fagus crenata, occupying both the ridge top and the valley bottom in a cool-temperate forest in Japan were investigated. For leader crowns, the number of cur...
Article
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Bringing together leaf trait data spanning 2,548 species and 175 sites we describe, for the first time at global scale, a universal spectrum of leaf economics consisting of key chemical, structural and physiological properties. The spectrum runs from quick to slow return on investments of nutrients and dry mass in leaves, and operates largely indep...
Article
We examined the crown architecture of two canopy species, Fagus crenata Blume, which is highly shade tolerant, and Quercus crispula Blume, which is less shade tolerant, in upper and lower positions on a slope in a cool-temperate forest in Japan. The purpose of this study was to investigate the relative effects of the competitive position for the li...
Article
We investigated the flowering phenology, pollinator visitation, and fruit set of 25 animal-pollinated woody species in a warm temperate secondary forest in Japan. Various species flowered sequentially from February to October. The principal pollinators were bumblebees, honey-bees, flies and/or beetles and birds; bumblebees and flies/beetles pollina...
Article
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For a shade-tolerant SE Asian tropical tree, Elateriospermum tapos (Euphorbiaceae), we studied field-established saplings in gaps and the shaded understory to test the hypothesis that differences in leaf demography and leaf life span under contrasting light regimes should be functionally correlated with architecture, self-shading and nitrogen distr...
Article
We estimated crown characteristics, such as median crown height, leaf fall rate and leaf biomass, from litter leaves for a Malaysian canopy species, Elateriospermum tapos. Leaf morphology was compared between the harvested and litter leaves for trees of various heights. Also, litter traps were set systematically around the trees of various heights,...
Article
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To investigate crown development patterns, branch architecture, branch-level light interception, and leaf and branch dynamics were studied in saplings of a plagiotropically branching tree species, Polyalthia jenkinsii Hk. f. & Thoms. (Annonaceae) in a Malaysian rain forest. Lengths of branches and parts of the branches lacking leaves ('bare' branch...
Chapter
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We studied the phenology of leaf emergence in 94 trees and the leaf dynamics of 17 selected trees in the Pasoh Forest Reserve (Pasoh FR), Malaysia. We tested the following hypotheses: (i) the phenology of leaf emergence differs among trees of different heights because of differences in the relative importance of meteorological factors, and (ii) the...
Article
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Allometry of shoot extension units (hereafter termed “current shoots”) was analyzed in a Malaysian canopy species, Elateriospermum tapos Bl. (Euphorbiaceae). Changes in current shoot allometry with increasing tree height were related to growth and maintenance of tree crowns. Total biomass, biomass allocation ratio of non-photosynthetic to photosynt...
Article
1 Leaf demography was examined for trees of various heights over a 3.7-year period in a Malaysian rain forest. We compared demography between upper and lower parts of the crown and its relation to height. The results were analysed at the stand level by pooling several trees of various shade-tolerant species, as well as three species for which multi...
Article
During the redrawing of Figure 1 some of the bars within Exp. 1 were omitted, plus the incorrect species name was introduced on two of the graphs. The publishers would like to apologise to the authors and their readers for these errors. The corrected figure appears below.
Article
Full-text available
Leaf phenology was studied in individuals of a canopy species, Elateriospermum tapos (Euphorbiaceae), at various ontogenetic stages, in a Malaysian rain forest. The timing of leaf emergence was not synchronized among sapling individuals, and was not correlated with any meteorological factors of the preceding month. The timing of leaf fall in saplin...
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Seed dispersal is the predominant mobile stage for sessile plants, and critically affects the distribution patterns of the species (Nathan & Muller-Landau 2000). Thus, seed dispersal patterns are important in understanding the population dynamics of the species.
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The mechanism of general flowering in Dipterocarpaceae in the Malay Peninsula is revealed through field survey and meteorological data analyses. The regions of general flowering coincide with those which experienced a low night-time temperature (LNT) c. 2 mo before flowering. This supports the hypothesis that low air temperature induces the develop...

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