宮崎県東諸県郡綾町川中の照葉原生林におけるニホンジカの採食の影響  [in Japanese] Influence of feeding pressure by Sika deer (Cervus nippon) on the primeval lucidophyllous forest in Kawanaka, Aya, Miyazaki Prefecture  [in Japanese]

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Abstract

  1. 宮崎県東諸県郡綾町川中の照葉原生林において,シカの採食による顕著な被害が発生する以前の1988年当時の植生調査資料と激しい被害を受けている2009年現在の植生調査資料とを比較し,照葉原生林の階層構造,種多様性,種組成へのシカの採食の影響を調査した.<BR>  2. 階層構造についてはシカの採食によって,第2低木層と草本層の平均植被率がそれぞれ約1/2,1/5に大きく減少した.<BR>  3. 階層別の種多様性については全階層と第2低木層において平均照葉樹林構成種数がそれぞれ約3/4,1/2に大きく減少した.<BR>  4. 生活形別の種多様性については照葉高木,照葉低木,照葉つる植物,多年生草本において平均種数がそれぞれ2.4種,3.8種,1.2種,2.4種減少した.<BR>  5. 減少種数は25種,消失種数は35種,増加種数は6種,新入種数は33種となり種組成は変化した.<BR>  6. 他地域から報告されている不嗜好性植物と比較した結果,増加種のうちバリバリノキ,マンリョウ,マムシグサなどの12種が本調査地の不嗜好性植物と認められた.<BR>  7. 本調査地の照葉原生林の階層構造,種多様性,種組成はともにシカの採食によって大きな被害を受けており,照葉原生林の保全対策が望まれる.

We conducted a phytosociological survey in the primeval lucidophyllous forest of Kawanaka, Aya, Miyazaki Prefecture in 1988. Since the 1990s, the population density of the Sika deer (Cervus nippon) has increased, and their feeding pressure on vegetation has been conspicuous. In 2009, we conducted a phytosociological survey in primarily the same stands as in 1988 to compare the layer structure, the species richness and species composition of the forest in 1988 with those in 2009. The coverage of the second shrub layer and the herb layer was decreased significantly by feeding pressure. Species richness in the second shrub layer significantly decreased; however, there was no significant difference in that of the herb layer. The species richness of four life forms, i.e., lucidophyllous tree, lucidophyllous small tree, lucidophyllous shrub and terrestrial herb significantly decreased. The total number and the mean number of component species of the lucidophyllous forest decreased from 109 and 60.3 in 1988 to 92 and 45.6 in 2009, respectively. The numbers of species that decreased and increased in frequency or coverage between 1988 and 2009 were 25 species and 6 species, respectively. Representative decreased species were Trachelospermum asiaticum var. intermedium, Ardisia pusilla, Rubus buergeri, and Diplazium subsinuatum. On the other hand, the 12 species, including Actinodaphne longifolia, Ardisia crenata, and Arisaema japonicum, were considered to be unpalatable plants by studies from other regions. This investigation clarified that feeding pressure of Sika deer was responsible for the changes in the layer structure, species richness and species composition of the primeval lucidophyllous forest.

Journal

  • Vegetation Science

    Vegetation Science 27(1), 35-42, 2010

    The Society of Vegetation Science

References:  15

Cited by:  2

Codes

  • NII Article ID (NAID)
    110007641919
  • NII NACSIS-CAT ID (NCID)
    AA11347548
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    1342-2448
  • NDL Article ID
    10762785
  • NDL Source Classification
    ZR3(科学技術--生物学--植物) // ZU4(書誌・図書館・一般年鑑--専門書誌)
  • NDL Call No.
    Z18-3499
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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