Recursos de colección

Hokkaido University Collection of Scholarly and Academic Papers (135.711 recursos)

HUSCAP (Hokkaido University Collection of Scholarly and Academic Papers) contains peer-reviewed journal articles, proceedings, educational resources and any kind of scholarly works of Hokkaido University.

Eurasian journal of forest research

Mostrando recursos 1 - 20 de 38

  1. Development of teaching materials for international course students on the ancient forest culture of the Hokkaido University Campus

    Watanabe, Yoko; Moriya, Toyohito; Takakura, Jun; Satoh, Fuyuki; Koike, Takayoshi
    Many plant remains including pollen fossils, wooden artifacts and charred woods from Epi-Jomon culture (about 2000 years ago) to the Ainu culture period (about 400 years ago) have been excavated from the Hokkaido University Campus sites. Wood identification and pollen analysis have revealed the forest vegetation and wood utilization by ancient people, i.e., the ancient forest culture, for each era in this site. It is necessary to organize systematically the data concerning this ancient forest culture for showing an importance role of our campus as state property. Furthermore, the elucidation of the ancient forest culture is important because it can...

  2. Development of teaching materials for international course students on the ancient forest culture of the Hokkaido University Campus

    Watanabe, Yoko; Moriya, Toyohito; Takakura, Jun; Satoh, Fuyuki; Koike, Takayoshi
    Many plant remains including pollen fossils, wooden artifacts and charred woods from Epi-Jomon culture (about 2000 years ago) to the Ainu culture period (about 400 years ago) have been excavated from the Hokkaido University Campus sites. Wood identification and pollen analysis have revealed the forest vegetation and wood utilization by ancient people, i.e., the ancient forest culture, for each era in this site. It is necessary to organize systematically the data concerning this ancient forest culture for showing an importance role of our campus as state property. Furthermore, the elucidation of the ancient forest culture is important because it can...

  3. Qualitative analysis of dynamic states of the Larix-permafrost ecosystem under climate warming

    Antonovsky, Mikhail Ya.; Korzukhin, Mikhail D.; Shugart, Herman Henry
    Dahurian Larch, Larix gmelinii, grows as a tree in the continuous permafrost region of eastern Siberia. Along with other allied Larch species and/or subspecies (notably L. cajanderi), it can grow on continuous permafrost. The expected warming of the climate in Siberia from global warming will reduce the permanent permafrost area, and will have an effect on the reduction in distribution of the larch. We investigate the possible forest succession effects in the interactive system among larch, dark conifers and climate using a simple conceptual model. The basic variables are the larch biomass, BL, the dark conifer biomass, BD, and the...

  4. Qualitative analysis of dynamic states of the Larix-permafrost ecosystem under climate warming

    Antonovsky, Mikhail Ya.; Korzukhin, Mikhail D.; Shugart, Herman Henry
    Dahurian Larch, Larix gmelinii, grows as a tree in the continuous permafrost region of eastern Siberia. Along with other allied Larch species and/or subspecies (notably L. cajanderi), it can grow on continuous permafrost. The expected warming of the climate in Siberia from global warming will reduce the permanent permafrost area, and will have an effect on the reduction in distribution of the larch. We investigate the possible forest succession effects in the interactive system among larch, dark conifers and climate using a simple conceptual model. The basic variables are the larch biomass, BL, the dark conifer biomass, BD, and the...

  5. Concentration of Some Trace Elements in Two Wild Edible Ferns, Diplazium esculentum and Stenochlaena palutris, Inhabiting Tropical Peatlands under Different Environments in Central Kalimantan

    Rahmawati, Della; Wijaya, C. Hanny; Hashidoko, Yasuyuki; Djajakirana, Gunawan; Haraguchi, Akira; Watanabe, Toshihiro; Kuramochi, Kanta; Nion, Yanetri Asi
    Young leaves of two wild ferns (Diplazium esculentum and Stenochlaena palutris) are uniquely eaten among local peoples in Kalimantan Island. These edible ferns are regarded as important sources of Fe and other trace elements essential for human body. In order to investigate the effect of soil environments on the metal content, we analyzed eight elements (Al, Fe, Cr, Cu, Mn, Zn, Cs, and Pb) in the edible ferns collected from five different sites (riverside of Kahayan River near Bukit Rawi, farming area in Tangkiling, natural forest near Kasongan, and two peat soils at campus of The University of Palangkaraya and...

  6. Concentration of Some Trace Elements in Two Wild Edible Ferns, Diplazium esculentum and Stenochlaena palutris, Inhabiting Tropical Peatlands under Different Environments in Central Kalimantan

    Rahmawati, Della; Wijaya, C. Hanny; Hashidoko, Yasuyuki; Djajakirana, Gunawan; Haraguchi, Akira; Watanabe, Toshihiro; Kuramochi, Kanta; Nion, Yanetri Asi
    Young leaves of two wild ferns (Diplazium esculentum and Stenochlaena palutris) are uniquely eaten among local peoples in Kalimantan Island. These edible ferns are regarded as important sources of Fe and other trace elements essential for human body. In order to investigate the effect of soil environments on the metal content, we analyzed eight elements (Al, Fe, Cr, Cu, Mn, Zn, Cs, and Pb) in the edible ferns collected from five different sites (riverside of Kahayan River near Bukit Rawi, farming area in Tangkiling, natural forest near Kasongan, and two peat soils at campus of The University of Palangkaraya and...

  7. Topographic and Anthropogenic Factors Shaping Subalpine Abies spectabilis Forest in Langtang National Park, Eastern Himalaya

    Tiwari, Ravi M.; Shrestha, Bharat B.; Kohyama, Takashi S.
    Located in the Himalayas, and situated at the highest altitude worldwide, the subalpine forests have come under human pressure through means of timber logging, livestock farming and tourism, which has brought about the progress of degradation. Thus, it is essential to quantify how forest structure is determined by environmental factors over the range of subalpine zone for better management planning. We investigated the subalpine forest dominated by Abies spectabilis in Langtang National Park, Nepal Himalaya, by setting 80 plots of 10-by-10 m scattered over the range of subalpine forest from 3170 to 3810 m a.s.l. on a north-facing slope, and...

  8. Topographic and Anthropogenic Factors Shaping Subalpine Abies spectabilis Forest in Langtang National Park, Eastern Himalaya

    Tiwari, Ravi M.; Shrestha, Bharat B.; Kohyama, Takashi S.
    Located in the Himalayas, and situated at the highest altitude worldwide, the subalpine forests have come under human pressure through means of timber logging, livestock farming and tourism, which has brought about the progress of degradation. Thus, it is essential to quantify how forest structure is determined by environmental factors over the range of subalpine zone for better management planning. We investigated the subalpine forest dominated by Abies spectabilis in Langtang National Park, Nepal Himalaya, by setting 80 plots of 10-by-10 m scattered over the range of subalpine forest from 3170 to 3810 m a.s.l. on a north-facing slope, and...

  9. Ecophysiological Study on the Natural Regeneration of the Two Larch Species with Special References to Soil Environment in Larch Forests

    Qu, Laiye
    Larch plantations cover approximately 4700km2 of the island of Hokkaido and have become the principle forest ecosystem in northern Japan. This study focused on how the environmental and biological factors affect the regeneration of Japanese larch (JL: Larix kaempferi) and hybrid larches F1 (HL: Larix gmelinii x L. kaempferi) by comparing their ecophysiological characteristics of growth patterns (carbon balance, nutrient balance, the source of CO2), especially relative to their root growth. Based on the review, we could forecast which larch species will have dominancy if they co-exist under the same environmental conditions in nature. In all, under relatively good growth...

  10. Ecophysiological Study on the Natural Regeneration of the Two Larch Species with Special References to Soil Environment in Larch Forests

    Qu, Laiye
    Larch plantations cover approximately 4700km2 of the island of Hokkaido and have become the principle forest ecosystem in northern Japan. This study focused on how the environmental and biological factors affect the regeneration of Japanese larch (JL: Larix kaempferi) and hybrid larches F1 (HL: Larix gmelinii x L. kaempferi) by comparing their ecophysiological characteristics of growth patterns (carbon balance, nutrient balance, the source of CO2), especially relative to their root growth. Based on the review, we could forecast which larch species will have dominancy if they co-exist under the same environmental conditions in nature. In all, under relatively good growth...

  11. Ethylenediurea (EDU) as a protectant of plants against O₃

    Agathokleous, Evgenios; Koike, Takayoshi; Saitanis J, Costas; Watanabe, Makoto; Satoh, Fuyuki; Hoshika, Yasutomo
    Ethylenediurea (EDU) is an anti-ozonant substance that is recognized as a versatile research tool, and recently attracts increasing interest. As many wild plant species are forced into complex responses by tropospheric ozone (O3), these responses are crucial for the functioning of ecosystems and consequently for the biosphere; thus, countermeasures are required. A plethora of substances have been evaluated as to their effectiveness in protecting plants against O3. EDU is the most widely-used substance in O3 research, in order to moderate O3 effects on plant growth. We present a synoptic table with recent literature on EDU applications to plants as a protectant against...

  12. Wild plant species as subjects in O₃ research

    Agathokleous, Evgenios; Saitanis J, Costas; Satoh, Fuyuki; Koike, Takayoshi
    Tropospheric ozone (O3) occurs in high concentrations nowadays and affects a many plant species in Northern hemisphere. Numerous wild plant species are known to be negatively affected by O3, and this may impact biodiversity and ecosystems in near future. Given the importance of O3 research with wild plants, we provide a list of 473 relevant taxa - that have been used as a subject of O3 research - as a research material, under various controlled-environment facilities, along with information about their response to O3. In addition, we include species which have been reported that they had developed ozone-like (but not...

  13. Differences in Pollen Resource Usage and Foraging Periods between the Exotic Bumblebee Bombus terrestris and the Native B. pseudobaicalensis and B. hypocrita sapporoensis in Hokkaido, Japan

    Nakamura, Yasuhide
    Bombus terrestris Linnaeus is an exotic bumblebee species that has recently been naturalized in Hokkaido, Japan. Some studies have suggested that the naturalization of this species has caused a decline in the native bumblebee populations. The present study focuses on differences in plant resource usage between coexisting exotic (B. terrestris) and native (B. pseudobaicalensis and B. hypocrita subsp. sapporoensis) bumblebee species in the Ishikari lowland region of Hokkaido. We observed the workers of the three species that came to forage in the investigation area during an approximately five-month period. In addition, we captured some of the bees carrying pollen to analyze the pollen grains attached to their...

  14. Tree Shape and Resistance to Uprooting : A Simple Model Analysis

    Shibuya, Masato; Koizumi, Akio; Torita, Hiroyuki
    We examined tree resistance to uprooting in relation to tree shape using a simple, qualitative model for the ratio of the resistive moment to the overturning moment. For this analysis, we used model trees and varied the crown size for a fixed stem size for a ratio of crown mass to stem mass that varied from 0.1 to 1. The results predicted the phase transition in the resistance trend in relation to the crown mass/stem mass ratio. Resistance increased on both sides of the crown mass/stem mass ratio, and was minimized at intermediate ratios. This indicates that crown expansion contributes to resistance to the right side...

  15. Variation on Genotypes and Flowering Characters Affecting Pollination Mechanisms of Sandalwood (Santalum album Linn., Santalaceae) Planted on ex-situ gene Conservation in Yogyakarta, Indonesia

    Yeni, W. N. Ratnaningrum; Sapto, Indrioko
    This research is a part of the long term research on sandalwood improvement strategy based on gene conservation approaches, focused on gene diversity and flowering characteristics of seven sandalwood provenances planted on ex-situ gene conservation in Wanagama Forest Research Station, Yogyakarta Province, Indonesia, and its effect on pollination mechanisms. Juvenile leaves sampled from any individual of each provenance where isozyme analyses then conducted with vertical polyacrilamide gel electrophoresis procedures based on David-Ornstein method with 3 enzyme systems: SHD, EST and DIA. Standard genetic distance measured following Nei and dendrogram then made following cluster analyses based on UPGMA. Parameters of flowering measured daily on each of 10 selected...

  16. Soil-Atmosphere Exchange of CO2, CH4 and N2O in Northern Temperate Forests : Effects of Elevated CO2 Concentration, N Deposition and Forest Fire

    KIM, Yong Suk
    Global environmental change and its causes and effects in relation to natural and anthropogenic activity have been the recent focus of concern. An important component of this issue is the role management of soils plays in contributing as a source or sink of greenhouse gases (GHGs), e.g. carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), etc. In forest ecosystems, especially, the production and consumption of these three GHGs are biologically mediated, but also strongly controlled by natural or man-made disturbances and other climate changes influenced environmental variables, e.g. elevated atmospheric CO2 concentrations (Chapter 2), nitrogen (N) deposition (Chapter 3) and fire (Chapter 4). In this study, such...

  17. Yield of Larix sukaczewii Dyl. and Larch Hybrids in Northern Scandinavia

    LARS, Karlman; OWE, Martinsson; CHRISTER, Karlsson; GISLE, Skaaret
    Yield of bulk collected provenances of Larix sukaczewii was compared to first generation Russian larch hybrids and three other tree species native to Scandinavia. The hybrids were full sib families of selected European and Russian larch (L. decidua x L. sukaczewii) or Japanese and Russian larch (L. kaempferii x L. sukaczewii). Two provenances of L. sukaczewii were compared. The results after 50 years show that the provenance from Arkhangelsk produced more volume and had better height growth on five of six sites in northern Sweden compared to a provenance from the central Ural Mountains, Sverdlovsk. The hybrid L. decidua x L. sukaczewii which is present in...

  18. Seed and Cone Characteristics of Scots pine (Pinus sylvestris L.) from Diverse Seed Sources in Northern Mongolia

    UDVAL, Bayarsaikhan; BATKHUU, Nyam-Osor
    The objective of this study was to determine the variation of seed and cone characteristics of Scots pine (Pinus sylvestris L.) from different seed collection sites in the Tujiin nars region of the Selenge province in Northern Mongolia. The cones and seeds of P. sylvestris showed significant differences in size and color. There were three major groups in seed coat color, black, brown and light, respectively, that were tested for seed quality. Seed quality was examined by the weight of 1000 seeds, germination energy, and germination capacity. Study results showed considerable disparities in seed quality among the seed color groups. At 92.3 percent, germination of black...

  19. Raman and Infrared Spectroscopic Marker Bands for Rapid Detection of Cyanomaclurin

    SHIBUTANI, Sakae; YAMAUCHI, Shigeru; KOIZUMI, Akio
    Methanol extracts from Artocarpus heterophyllus, which is a tropical polyphenol-rich tree species, were separated by column chromatography and six fractions were obtained as powder. Raman and infrared (IR) spectra of all the fractions were recorded, and it was found that cyanomaclurin, which was one of the fractions and a flavonoid available for biomedical research, showed two characteristic Raman and IR bands in the 750-700 cm-1 wavenumber region. These spectroscopic results show the high potential of these vibrational bands as a marker for rapid detection of cyanomaclurin.

  20. Overview of the Study of the Genus Myricaria Desv. in Siberia

    LYAKH, Elena M.
    Myricaria is a shrub. it grows on pebble, and rocky banks of the mountainous rivers in the southern regions of Siberia. The academician P.S. Pallas was the first who became interested in Myricaria plants when traveling in the mountains of South Siberia. C.L. Willdenow (1816), C.G. Ehrenberg (1827), A.A. Bunge (1835), K.J. Maximovich (1889), S.G. Gorshkova (1949) and other scientists studied the species of this genus. E.G. Bobrov (1967) made the first review of this genus. A detailed analysis of literature and herbarium specimens of the Siberian species of the genus Myricaria was performed. There is no consensus on taxonomy of Siberian species of this genus...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.