Hiroshi Takeda

Hiroshi Takeda
Doshisha University · Department of Environmental Sciences

Dr Agri.

About

159
Publications
16,417
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5,142
Citations
Citations since 2017
4 Research Items
1569 Citations
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300

Publications

Publications (159)
Article
The nitrogen (N) concentration of green and senescent leaves, and the N resorption efficiency of 13 dominant species from three distribution patterns along a slope (Ridge, Valley, and Uniform types) and two types of leaf emergence pattern (determinate and indeterminate flush types) were examined in a cool temperate natural forest in central Japan....
Article
The process of litter decomposition is driven by interactions among climate, litter quality, and decomposers. However, information about the soil animal community involved in fine-root litter decomposition remains limited. We compared the composition of the soil microarthropods involved in leaf and root decomposition in field experiments using litt...
Article
Litter quality plays predominant roles in plant litter decomposition by modifying the activity of decomposer fungi, but little is known about the response of the decomposing activity of individual fungal strains to variations in litter quality. In the present study, the variability in the decomposing ability of a single fungal strain (Trametes vers...
Article
We conducted a 13CO2 pulse-labeling experiment to trace the transfer of recently assimilated carbon (C) from woody plants to soil microarthropods. We investigated the utilization of root-derived C for six species of Collembola that differ in terms of their morphological traits and vertical distributions. Although species living in deeper soil layer...
Article
Fine root dynamics and root architecture were studied in the organic and mineral soil layers of a Cryptomeria japonica plantation. Fine root biomass (<1 mm) showed seasonal changes whereas fine root biomass (1–2 mm) was unchanged over the study period. Root tips were grouped into size classes based on root tip diameter, including <0.5, 0.5–1, and 1...
Article
Full-text available
Fine roots of Cryptomeria japonica were separated into two functional groups: primary roots that serve as the principal agent for water and nutrient absorption and secondary roots that have transport capacity and protect the plant from environmental stress. Individual roots can also be categorized by three characteristics: diameter, branching order...
Article
Full-text available
Among the factors determining litter decomposition rates, the role of soil fauna as decomposers still remains unclear, especially for how they are involved in decomposing below-ground root litter compared to their relatively-known contributions to decomposing above-ground leaf litter. We conducted a litterbag experiment using two sizes of meshes an...
Article
Great Cormorant (Phalacrocorax carbo), a piscivorous bird, has established breeding colonies in a coniferous forest near Lake Biwa in central Japan. This study investigated the possible effects of the colony’s excreta on the mass, nitrogen (N) content, and decomposition of woody debris. Study plots were established in forest stands representing fou...
Article
Full-text available
Key message There is a positive correlation between leaf and root decomposition across species, both in a warm-temperate forest in Japan, as well as globally. Abstract Evaluating the effects of plant species traits on litter decomposition would increase our understanding of plant-soil feedbacks in forest ecosystems. Currently, an assessment of a po...
Article
Full-text available
Solid-state 13C nuclear magnetic resonance (NMR) spectroscopy was applied to coarse woody debris (CWD) in different stages of decomposition and collected from forest floor of a subtropical, a cool temperate, and a subalpine forest in Japan. The purpose was to test its applicability to characterize organic chemical composition of CWD of broad-leaved...
Conference Paper
Among the factors determining litter decomposition rates, the role of soil fauna as decomposers still remains unclear, especially for how they are involved in decomposing below-ground root litter compared to their relatively-known contributions to decomposing above-ground leaf litter. We conducted a litterbag experiment using two sizes of meshes an...
Article
Endophytic mycobiota on leaves, twigs and cupules of Fagus crenata were investigated using a culture-dependent method over a growing season to test the hypothesis that endophytic fungi of cupule (a woody phyllome) share some components of the endophytic fungal assemblages with both leaves and twigs. A total of 14 fungal taxa were isolated, and the...
Article
Far less is known about the coarse woody debris (CWD) stock and decay process in temperate Asia compared with that in boreal and temperate Europe and North America. We estimated coniferous CWD stock (logs and snags), decay rate and process, and fungal species responsible for the decay process in a Japanese subalpine coniferous forest. The CWD mass...
Article
Full-text available
We investigated soil microarthropod communities in two physically dissimilar inorganic soil materials and in a mixture of these two materials to examine the effect of the structural complexity of a habitat on microarthropod abundance and communities, teasing it out from that of nutritional factors. Mesh boxes were filled with perlite (a highly poro...
Article
Full-text available
The higher abundance of microarthropods around plant roots has been considered to result from the release of labile carbon by roots (e.g., root exudation), but the concentration of labile carbon itself has not been measured. We investigated whether fine root distribution affects distribution of Collembola (Folsomia candida) by changing the soil dis...
Article
We investigated the effects of overstory canopy openness and seedling density on seedling morphology and growth in the mid-successional species Acer nipponicum Hara in a cool-temperate forest. Studied seedlings were 46 seedlings of 30–160 cm height, and their overstory canopy openness ranged between 7.2% and 17.0%. Seedling density, measured as the...
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...
Article
Little is known about the collembolan community involved in the decomposition of fine root (≤2.0 mm in diameter) litter, which is largely different from leaves in both litter quality and position. The collembolan communities involved in root and leaf litter decomposition were compared in a litterbag experiment in a coniferous forest of Chamaecypari...
Article
A microarthropod community established in artificial soil containing different amounts of organic matter was examined to evaluate the community response to organic matter. On a forest floor of a cypress stand, mesh boxes were filled with grains of perlite, a porous mineral material, mixed with three different quantities (0, 1.55, and 3.1gCL−1) of o...
Article
Full-text available
We tested the decay abilities of 28 isolates from 28 lignicolous fungal species (Basidiomycota, Ascomycota and Zygomycota) with the pure culture test. We used beech wood powder in varying moisture conditions and decay stages (nondecayed, intermediately decayed and well decayed) as substrates. The weight loss in wood powder was -0.2-17.8%. Five isol...
Article
Current shoots, which form the crown of a tree, are specialized in various functions such as crown expansion, reproduction, and assimilation. We examined the temporal and spatial distribution of reproductive shoots in Alnus hirsuta Turcz. var. sibirica (Fischer) C.K. Schn., assessed their direct and indirect costs of reproduction, and explained the...
Article
Full-text available
Light environment and crown architecture were investigated in two closely related species (deciduous Vaccinium hirtum and evergreen Vaccinium bracteatum) in a young and an old secondary forest. Light environment was determined by photographic estimation of light above ramets (30–500 cm tall). Crown architecture was examined to determine the effects...
Article
Full-text available
The rules of crown development in the clonal shrub Vaccinium hirtum Thunb. in a low-light understory were identified by architectural analysis, and the structure and dynamics of current-year shoots were quantified. Development started from an initial orthotropic axis, which forked into plagiotropic axes; consequently, arched stems were formed. Subs...
Article
Fungi, especially basidiomycetes, are the primary agents of woody debris decomposition in terrestrial forest ecosystems. However, quantitative data regarding the abundance and decay activity of wood-inhabiting fungi are lacking, especially for tropical and subtropical areas. This study demonstrates the dynamics of decay columns of wood-inhabiting f...
Article
Decomposition of coarse woody debris (CWD) is an important component of the carbon cycle and biodiversity of forest ecosystems. Dynamics of organic chemicals, nutrients and occurrence of fungi during CWD decomposition have been studied intensively in coniferous boreal forests. However, little attention has been paid to the CWD of angiosperms that d...
Article
Initial decomposition rates, changes in organic chemical components (acid-insoluble fraction, holocellulose, polyphenols, soluble carbohydrates) and nutrient dynamics (K, Mg, Ca, P, N) were examined for fine roots and leaves of Japanese cypress (Chamaecyparis obtusa). Litterbag experiments designed to evaluate the relative effects of litter type an...
Article
Wood decay activity of Omphalotus guepiniformis, one of the most frequently occurring fruiting bodies on beech coarse woody debris in cool temperate forests in Japan, was estimated in situ by chronosequence with a five decay class system. The decay columns of O. guepiniformis increased from decay class 1 to decay class 2, where they occupied 20.2%...
Article
Nitrogen (N) uptake and nitrogen use efficiency (NUE) are closely related through feedback mechanisms to soil N availability and N cycling in forested ecosystems. We investigated N uptake and NUE not only at the leaf, litterfall, and aboveground levels but also belowground and whole stand levels along a topographic gradient of soil N availability i...
Article
To estimate nodule biomass of Alnus hirsuta var. sibirica, an N2-fixing tree species, we examined the distribution pattern and size structure of nodules in a 17 to 18year old stand naturally regenerated after disturbance by road construction in Japan. Nodules were harvested within 1m from the outer edge of stems of plants with different sizes on fo...
Article
Endophytic fungi of healthy twig tissues act as dominant primary colonizers of twig litters and are exposed to the attacks of saprobic secondary colonizers. In the present study, we examined the effect of interspecific interactions on the decay rate of twigs in laboratory experiments using two endophytic ascomycetes (Phomopsis sp. and Xylaria sp.)...
Article
Full-text available
Fallen logs of Japanese beech (Fagus crenata Blume) at various stages of decomposition were sampled from a cool temperate deciduous forest in Japan and studied for differences in the associated microfungus communities. Wood samples were directly plated onto each of two different media for the identification of fungal species. Approximately 1500 iso...
Article
Full-text available
Kakishima, M. (2009). Fungal succession and lignin decomposition on Shorea obtusa leaves in a tropical seasonal forest in northern Thailand. Fungal Diversity 36: 101-119. Fungal succession and decomposition processes of Shorea obtusa (Dipterocarpaceae) leaves were studied in a tropical seasonal forest in northern Thailand. The study focused on blea...
Article
Dry evergreen forest (DEF) and dry deciduous dipterocarp forest (DDF) are major forest types extensively distributed in northeastern Thailand, exhibiting different nutrient cycling properties. This study aims to improve our understanding on the pattern of mass loss and nitrogen release from two categories of roots (fine, <2mm and small, 2–5mm) of H...
Article
The growth rate and morphological characteristics of fine root systems are important both for nutrient absorption by trees and for material cycling in forest soil ecosystems. Interactions among soil organisms, such as fungi and fungivorous microarthropods, may be important in influencing tree fine root growth and morphology. We carried out a soil m...
Article
The relationships between roots and soil communities are not well understood. We used the ingrowth-core method with L-, FH-, and M-layer substrates to investigate the relationships among soil organic carbon, fine root biomass, hyphal length and the numbers of soil microarthropods. The study was carried out in a temperate forest of the arbuscular my...
Article
Full-text available
We assessed stem burial and adventitious root formation of two late-successional species, Abies mariesii and A. veitchii, in central Japan. In a plot (5×5m), all seedlings between 8 and 24cm tall were excavated: six A. mariesii seedlings in soil, and six and four A. veitchii seedlings in soil and on logs, respectively. For each sampled seedling, th...
Article
To better understand tree regeneration trajectories and the resultant coexistence of Abies with co-dominants, Picea jezoensis var. hondoensis, Tsuga diversifolia and Betula ermanii, in an old-growth subalpine forest, we investigated spatial mortality patterns during the regeneration of Abies mariesii and A. veitchii, which are abundant in the under...
Article
We examined niche differentiation in the root foraging strategies of four late-successional species, namely, Abies mariesii, Abies veitchii, Picea jezoensis var. hondoensis, and Tsuga diversifolia, in an old-growth subalpine forest on Mt. Ontake in central Japan. Substrate type and substrate height were assessed for all the trees (H ≥ 2 m) in a 1.0...
Article
Full-text available
This paper investigates the developmentally programmed and plastic processes of growth in the multistemmed, deciduous shrub Vaccinium hirtum Thunb. We conducted the demographic censuses of stems and the measurements of stem growth and morphology along a natural light gradient in forest understory. With light availability from 5%–28%, the probabilit...
Article
The pattern of changes in the physicochemical properties of wood, and its relationship with fungal succession during decomposition of coarse woody debris (CWD) of beech (Fagus crenata Blume) were investigated. In total, 47 snags and 66 logs were assigned to a system of five decay classes, and were used for analysis of the decomposition process. The...
Article
We studied the dynamics of the stable C isotope ratio (δ13C) of Swida controversa and Fagus crenata leaf litter during decomposition for 35months with reference to the relative enrichment of the residue by lignin fraction-derived C. The study was carried out on upper and lower parts of a forest slope in a cool temperate forest in Japan. The enrichm...
Article
The effects of clear-cutting on the decomposition rate of leaf litter and on nitrogen (N) and lignin dynamics were investigated in a temperate secondary forest. Decomposition processes were examined over an 18-month period by the litterbag method and compared between a clear-cut site and an adjacent uncut control site using leaf litter from five do...
Article
We measured the natural stable carbon (C) and nitrogen (N) isotope ratio patterns of collembola and the organic substrates of their habitats and potential food sources in a warm temperate coniferous forest. Based on previous studies, we classified collembola into successional classes along litter decomposition gradients: early colonizers, late colo...
Article
We investigated microfungal assemblages on leaf litter within a subalpine forest in central Japan and their variation with season, litter depth, and litter species. Microfungal assemblages were compared for Abies needles and Betula leaf litter collected from litter and fermentation layers of the forest floor during the growing season in spring, sum...
Article
The losses of carbon and nitrogen by the forest fire were measured in a dry dipterocarp forest (DDF), northeast Thailand. Seasonal changes in the aboveground biomass of understorey grass and their nitrogen concentrations were measured. The aboveground biomass of grass was increased from March to July during the rainy season and reached the peak of...
Article
Full-text available
In snowy alpine ecotones, difference in soil drainage condition through topographical features have a significant influence on structure and growth pattern of plants growing in these ecosystems. The aim of this study is to clarify the soil drainage effects on fine root dynamics of forest-meadow ecotone in high elevation ecosystems. Fine root distri...
Article
We conducted a comparative study of nitrogen (N) dynamics in soil by examining a dry dipterocarp forest (DDF) and a dry evergreen forest (DEF), under similar climatic conditions, in northeastern Thailand. The soil N dynamics were described by measuring seasonal N mineralization and nitrification rates, soil microbial biomass, and the size of inorga...
Article
Nutrient availability and temporal variation of physical stress are usually higher in organic soil layers than in mineral soils. Individual roots within the fine-root system adjust anatomical, morphological, and turnover characteristics to soil conditions, for example nutrient availability and physical stresses. We investigated anatomical traits, i...
Article
The possible effects of excreta of the Great Cormorant Phalacrocorax carbo on decomposition processes and dynamics of nutrients (N, P, Ca, K, Mg) and organic chemical components (lignin, total carbohydrates) were investigated in a temperate evergreen coniferous forest near Lake Biwa in central Japan. Two-year decomposition processes of needles and...
Article
The effect of litter type and incubation temperature on the ability of fungi to decompose leaf litter of subalpine trees was examined by a pure-culture test. Mass loss of Abies needle and Betula leaf litter and utilization patterns of lignin and carbohydrates were investigated under two temperature conditions (20 C and 10 C) and compared for 29 spe...
Article
Full-text available
The effect of litter type and incubation temperature on the ability of fungi to decompose leaf litter of subalpine trees was examined by a pure-culture test. Mass loss of Abies needle and Betula leaf litter and utilization patterns of lignin and carbohydrates were investigated under two temperature conditions (20 C and 10 C) and compared for 29 spe...
Article
Size-related variation in the cost and probability of flowering among shoots within a crown of Vaccinium hirtum was investigated to clarify patterns and regulation of flowering at the shoot-module level, below the level of the individual. The apices of previous-year shoots differentiated into current-year shoots vegetatively (vegetative branches) o...
Article
A soil arthropod community was studied in a dry evergreen forest over a 3-year period from May 1998 to April 2001. Population abundance, species composition, and community structure were investigated over the 3-year study period. The soil arthropods consisted of Acari (75.38%), Collembola (16.11%), and others (8.51%), and their abundances showed a...
Article
Full-text available
Decomposition of lignin, holocellulose, polyphenols and soluble carbohydrates was investigated in relation to nitrogen (N) dynamics in leaf litter of 14 tree species. The influence of organic chemical components and N on litter mass loss rate was then evaluated for 14 litter types. The study was carried out over a 3-year period on upper and lower p...
Article
Endophytic fungi occur on various types of leaf litter, but few studies have been done on their roles as saprophytes in decomposition. This study examined the succession of fungi in live, newly shed, and decomposing leaves at 2 months of decomposition of Camellia japonica and chemical changes in decomposing leaves colonized by endophytes. Coccomyce...
Article
Decomposition processes of Camellia japonica leaf litter were investigated over an 18-month period with reference to the role of fungal succession in the decomposition of lignin and holocellulose. Decomposition and fungal succession were studied in bleached and nonbleached portions of litter, which were precolonized by ligninolytic and cellulolytic...
Article
To understand the physiology of fine-root functions in relation to soil organic sources, the heterogeneity of individual root functions within a fine-root system requires investigation. Here the heterogeneous dynamics within fine-root systems are reported. The fine roots of Chamaecyparis obtusa were sampled using a sequential ingrowth core method o...
Article
Fungal communities within a naturally fallen bough of Japanese beech (Fagus crenata) were investigated with reference to chemical properties of decay columns. Five logs were cut out from the fallen bough, which ranged from 10.7 to 20.5 cm in diameter. Nine fungal species and one sterile fungus were isolated from decay columns that elongated along a...
Article
Full-text available
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
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
We assessed 62 fungal strains in 31 species of wood decay fungi in the ability to decompose wood blocks of Japanese beech (Fagus crenata) under a pure culture condition. Fungi were collected in a cool temperate beech forest in Japan and isolated from the inside of beech logs and from sporocarps fruiting on logs and snags of beech that were differen...
Article
Full-text available
Information on primary growth behavior after planting is required for mixed-plantation revegetation using broad-leaved species. To estimate primary growth, especially from the perspective of crown coverage and changing growth rates, we examined the growth and survival of four broad-leaved species that are frequently used in erosion-control plantati...
Article
Full-text available
We investigated current shoot properties in two contrasting vertical positions (leader crown; LC, and lower branch; LB) within the crowns of mature trees of two subalpine conifer species, Abies mariesii and A. veitchii. For both LCs and LBs, shoot length decreased with increasing branching order. However, shoot properties were different between LCs...
Article
Leaf-fall phenology was studied in a cool–temperate deciduous broad-leaved forest in central Japan in relation to the topographic environmental gradients that occur along a short mountain slope. Leaf-fall phenology was described quantitatively using data from leaf litter collected along the slope. In autumn, leaf fall at the study site tended to oc...
Article
Full-text available
The suitability of a color acetate film for estimating photosynthetic photon flux density (PPFD) in a forest understory was examined. The fading ratio of the film (F), the total PPFD (PPFDtotal) to which the film was exposed, and the average daily maximum temperature during exposure (T) were obtained from measurements at multiple sampling points th...
Article
Recent studies have remarked on differences in the life cycles of individual fine roots. However, the dynamics of individual roots with different life cycles, such as ephemeral and perennial, during root system development are still unknown. We examined individual roots during fine root system development in a mature stand of Chamaecyparis obtusa S...
Article
This study quantitatively compared the sapling (height 62–289cm) architecture and growth of Castanopsis cuspidata and Quercus glauca, both of which are major components in the temperate zone of western Japan, under shaded light conditions in secondary forest. When the sapling architectures were compared at the same support mass (trunk + branch mass...
Article
Floral sex allocation (weight of male flower buds over weight of female flower buds) was examined at the levels of current-year shoot, individual tree and population, and the tree individual level and population level floral sex ratio was explained as a consequence of the behavior of current-year shoots in the shoot-level monoecious (flowering curr...
Article
We examined limit values for decomposition and lignocellulose index (LCI, the ratio of acid-soluble holocellulose to acid-soluble holocellulose plus acid-insoluble lignin and lignin-like substances) in leaf litter decomposition of 14 tree species over 3 years. The study was carried out on upper (moder) and lower parts (mull) of a forest slope that...
Article
Ingrowth cores in the field were used to compare fine root characteristics of hinoki cypress (Chamaecyparis obtusa) among rooting substrate in the form of needle leaf litter, decomposing organic material, and mineral soil. Fine root growth, morphology, arbuscular mycorrhizal (AM) associations, and tissue C and N concentration were determined. The i...
Article
Full-text available
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
Immobilization and mobilization of nitrogen and phosphorus were investigated in relation to the nitrogen (L/N) ratio and lignin to the phosphorus (L/P) ratio as indicators of the nitrogen and phosphorus dynamics. The present study was carried out on upper and lower parts of a forest slope in a cool temperate forest in Japan. Net immobilization and...
Article
Water-extractable organic carbon (WEOC) drives the C and N cycles in forest ecosystems via microbial activity. However, few studies have considered both then spatial and temporal patterns of WEOC in forest soils. We investigated the spatial and temporal variation in WEOC along a topographic sequence in a cool temperate deciduous forest. The concent...
Article
The effects of root exclusion and planted tree species on soil nitrogen (N) dynamics were examined at two plantations, one planted with Japanese cedar and the other with Japanese cypress. We set up ten 1 × 1 × 0.2-m-deep trenched sites and ten untrenched control sites at each plantation. We measured the pool size and leaching of inorganic N at each...
Article
Full-text available
In a lowland tropical rain forest in Sarawak, leaf-litter decomposition and the initial litter chemistry of 15 tree species were studied. During 13 months of field experiment, weight loss of litter samples was between 44% and 91%, and calculated decomposition rate constants (k) ranged from 0.38 to 2.36 year−1. The initial litter chemistry also vari...
Article
Full-text available
The effects of tree species on the dynamics of nutrient transformations during leaf-litter decomposition are not well understood in tropical rain forests. To examine differences in the dynamics of C, nutrients, and organic constituents during decomposition among tree species, the leaf-litter decomposition of 15 trees was assessed using a litter-bag...
Article
Japanese cypress (Chamaecyparis obtusa Endl.) and Japanese cedar (Cryptomeria japonica D. Don) are common species for plantation forestry in Japan. Cypress is conventionally planted on sites of low fertility whereas for cedar high fertility sites are used. Objectives of this study were to compare the productivities of cypress and cedar plantations...
Article
We investigated structural and compositional characteristics of an old-growth subalpine forest in central Japan, to ascertain forest dynamics and species coexistence. The forest appeared to have been fairly-undisturbed, at least during several recent decades, judging from the maximum occupancy of space by living canopy trees and an unchanged canopy...
Article
Soil inorganic nitrogen supply and fine root mass in the top layers of mineral soil (0–5 and 5–10 cm) were investigated at upper and lower sites of a cool temperate forest where Fagus crenata and Quercus crispula dominate. At both sites, soil inorganic nitrogen supply was greatest in the 0–5 cm layer. The predominant forms of soil inorganic nitroge...
Article
Full-text available
Light-related plasticity of crown morphology and within-crown characteristics were investigated in understory sun and shade saplings of three codominant subalpine conifers, Abies mariesii M.T. Mast., Abies veitchii Lindl. and Picea jezoensis var. hondoensis (Mayr) Rehd. Compared with those of sun saplings, current-year shoots of shade saplings allo...
Article
Patterns in above- and belowground allocation of biomass and net primary production (NPP) along a topographic and soil N availability gradient were measured in a cool-temperate deciduous forest in central Japan. In this study site, soil N availability changed along the topographic sequence and decreased up the slope. Total NPP ranged from 8.8 to 14...
Article
Phyllosphere fungi on living leaves and their succession on decomposing leaves were studied on giant dogwood (Swida controversa). A total of 12 and 34 fungal species were isolated from the interior and surface, respectively, of living leaves, and 15 frequent species were considered as phyllosphere fungi. Six of these 15 species were also frequent o...
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
The dynamics of K, Ca, and Mg were investigated during the decomposition of 14 litter types over a 3-year period on the upper and lower parts of a forest slope in a cool temperate forest in Japan. Potassium dynamics were divided into initial leaching phase and late phase. Initial K concentrations for the initial phase were correlated with the rate...
Article
Siberian alder (Alnus hirsuta var. sibirica) shows annual variation in reproductive output. However, this phenomenon has not been explained by hypotheses proposed in previous studies. In this study, we constructed a matrix model of current-year shoot dynamics to estimate and compare the reproductive output of current-year shoot population with or w...
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
We investigated the effects of mixed conifer-deciduous canopies on the spatial patterns and growth of understorey saplings of dominant subalpine evergreen conifers. The distributions of Abies mariesii and of Abies veitchii saplings were significantly clumped at the microsites north of canopy trees of the deciduous Betula ermanii. Because irradiance...