ススキ株の生長と維持に関する研究 : 温暖地におけるススキ株の形成過程とその生態特性  [in Japanese] Studies on the Growth and Maintenance of Patch of Miscanthus sinensis Anderss : Formation process of the patch and its ecological characteristics in a warm region  [in Japanese]

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Abstract

ススキ株の苗条群と地下茎群の形成並びに現存量の器官別構成比に関する調査に基づき,温暖地方のススキの生態特性を明らかにした。株の占有面積が約1000cm^2以上に達すると,苗条と地下茎の大きさは最大となり,地下茎数の新旧比は一定となった。これらの株においては約2ヵ月間隔で年4回の分けつが発生した。この分けつ発生と地下茎物質の転移との間には密接な関係が認められた。地下茎の三次性分岐と少数の四次性分岐が翌年の株形成に直接寄与し,これらの越冬した地下茎と当年の新地下茎の容積は,生育終期においては全地下茎容積の約半分を占めた。したがって,当地ススキの地下茎寿命は約2年と推定された。ススキの生育期は4つの段階に分けられるが,温暖地のススキでは,このうち第2期の栄養繁殖的生長期が比較的長かった。現存量の構成比や地下茎寿命も他の調査結果と違っており,特に地下部重/地上部重比は冷涼地の値よりもかなり低かった。こうした違いには環境条件,特に気温の差が影響しているものと考えられた。

Observations on the development of shoots and rhizomes, and the component ratio among organs of the biomass of M. sinensis patch were carried out in the surburbs of Shizuoka city (34 58' N, 138 24' E) from 1974 to 1979. 1) When the area of the patch amounted to above nearly 1, 000cm^2, the shoot and rhizome sizes attained to the maximum levels, respectively. The numbor of the overwintered rhizomes in these patches accounted for about 30% of the total numbers. 2) On these patches, tillerings were observed four times in a year at intervals of about two months. Consequently, there were two peaks in the distribution pattern of the height of shoots in summer. Such tillerings seemed to be closely related to the changes in the bulk density of the total rhizomes. 3) Tertiary and quaternary branched rhizomes in the current year seemed to affect directly the patch formation of next year. These overwintered and new rhizomes accounted for about a half of the total volum at the end of the growth. 4) The annual process of the patch growth was divided into the four phases, based on the seasonal changes in the dry weight distribution between some organs. In this region, the second phase characterized by vegetative propagation continued for about three months, presumably longer than its period in the cooler regions. 5) Both ratios of underground parts to aboveground parts and aboveground stem-sheaths to leaves, and the life-span of the rhizomes in the present investigation differed from the other results, especially the ratio of underground parts to aboveground parts showed a considerably lower value than that in the cooler regions.

Journal

  • Japanese Journal of Grassland Science

    Japanese Journal of Grassland Science 27(1), 71-78, 1981

    Japanese Society of Grassland Science

Cited by:  3

Codes

  • NII Article ID (NAID)
    110006465824
  • NII NACSIS-CAT ID (NCID)
    AN00194108
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0447-5933
  • NDL Article ID
    2312701
  • NDL Source Classification
    RA47;RB74
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産) // ZR22(科学技術--農林水産--畜産)
  • NDL Call No.
    Z18-344
  • Data Source
    CJPref  NDL  NII-ELS  IR  J-STAGE 
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