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.


Mostrando recursos 1 - 5 de 5

  1. Plant Defense Characteristics and Hypotheses in Birch Species

    Novriyanti, Eka; Aoyama, Chiho; Watanabe, Makoto; Koike, Takayoshi
    Birches employ defense when under pressure, either biotic or abiotic or both. They have at least three types of defense against herbivores, involving physical, chemical and phenological strategies, whether the defense is constitutive or induced. Leaves usually use both types of defense, whereas woody parts (stems, branches, or twigs) deploy mostly chemical defense. Other studies scarcely differentiate between proposed plant defense models such as CNBH and GDBH, and the defensive responses of birches, since there is a large variation in defensive responses. The evidence supports neither the carbon-nutrient balance (CNB) nor the growth-differentiation balance (GDB) hypothesis in birch defense, indicating...
    - 21-oct-2017

  2. Growth Characteristics of Two Promising Tree Species for Afforestation, Birch and Larch in the Northeastern Part of Asia

    Mao, Qiaozhi; Watanabe, Makoto; Koike, Takayoshi
    Re-vegetation is urgently needed to increase the carbon sink for moderating atmospheric CO2 by forest ecosystem, especially northeastern part of Asia with large population. We partly plant fast-growing species, such as birch (Betula spp.), larch (Larix spp.) and poplar (Populus spp.) in northeastern China. Especially, birch species are used for sap production; larch and its hybrid (F1) are promising species for timber production and increasing the carbon sink. For understanding these afforestation materials, we review the distribution of birch and larch species in China and northern Japan. They have deciduous leaf habit and typical light-demanding traits and are found in...
    - 21-oct-2017

  3. An Atlas of Collembola Species in the Sapporo Experimental Forest of Hokkaido University in Northern Japan

    Suetsugu, Naoki; Satoh, Fuyuki; Koike, Takayoshi
    Collembola (Hexapoda: Collembola) is one of the most common soil animals in forests. Collembolans play an essential role in soil ecosystems, but their community structure and ecological role in forests are not fully understood because of difficulties with their classification. We have consequently developed an atlas of Collembolans in certain forest stands within the Sapporo Experimental Forest. The community structure of Collembolans varied greatly in each forest stand. The Isotomidae family was predominant in a mature larch stand and in young broad-leaved mixed stands, but in a spruce plantation the dominant family was Onychiuridae. The most abundant genera in the...
    - 21-oct-2017

  4. Induced Defense in Japanese White Birch Seedlings against Insect Herbivores

    Aoyama, Chiho; Novriyanti, Eka; Koike, Takayoshi
    Plants defend themselves against herbivores, pests and abiotic stresses. Although some defense traits in plants are constitutive, some are switched on, or increased, only when the plants have suffered from stresses (i.e. induced defense). Growth (i.e. lignin) and the synthesis of most defensive compounds in broad-leaved trees derive from phenylalanine. If, therefore, plants allocate photosynthates mainly to defense, these resources would not be available for growth (lignin synthesis). In this study, we examined the defense induced against grazing by the gypsy moth (Lymantria dispar) in seedlings of the white birch (Betula platyphylla var. japonica) grown under two nitrogen levels. We...
    - 21-oct-2017

  5. Prospects of Natural Hybridization of the Genus Picea A. Dietr. Representatives in Asiatic Russia

    Potemkin, Oleg N.
    Prospects of natural hybridization between P. obovata Ledeb and P. ajanensis (Lindl. et Gord.) Fisch. ex Carr), the main forest species of dark coniferous forests in the Siberian-Russian Far-Eastern area, are examined. Judging from the literature, they form a large-scale introgressive complex. On the basis of the study of polymorphism of the main morphological features that characterize these species as individual taxonomic units, it was concluded that there is an absence of natural hybridization between P. obovata and P. ajanensis in the regions of Siberia and the Russian Far East.
    - 21-oct-2017

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