北海道石狩海岸における車両の走行が植生と土壌に及ぼす影響  [in Japanese] The influence of the vehicle running on the vegetation and soil in Ishikari coast, Hokkaido  [in Japanese]

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Abstract

近年, 砂浜海岸において車両走行による植生破壊が問題となっている。北海道石狩海岸の砂丘上にある車両の進入を規制して9年が経過した地区で, 車両走行により裸地化していた撹乱区と撹乱を受けていない対照区を設け, 植生と土壌環境を比較することで車両走行の影響を把握した。海側のハマニンニク群落では植生がほぼ回復しており, その理由は地下茎繁殖を行う種が多いために植生の回復が早かったと考えられた。しかし, ハマニンニク群落でも汀線に近い場所以外では土壌が硬化しており走行の影響が認められた。汀線に近い場所で土壌への影響が見られなかった理由として, 汀線付近の砂は粒径が大きいため土壌の硬化が起こりにくいこと, 砂の堆積により走行の影響が蓄積されにくいことが推測された。ハマニンニク群落よりも陸側に位置するハマナス群落では, 走行によって植生の成帯構造が破壊されており, 撹乱区には外来種をはじめとする対照区には出現しない種の侵入が見られた。また土壌の硬化は表層から地下50 cmまで認められた。砂の堆積がほとんどないハマナス群落では, 土壌への走行の影響は長期間残留するものと考えられ, 本来の植生へ回復しない可能性も考えられた。

In coastal dunes, the destruction of vegetation by vehicles is of great concern. The purpose of this study was to investigate the running impact of vehicles on vegetation and soil, by comparing disturbed and undisturbed areas. The study area was enclosed by a fence and vehicles were prohibited from entering from 1992. At that time the disturbed areas were bare ground. This study was carried out in 2001, in the Ishikari coastal dune in Hokkaido. In the zone dominated by <i>Elymus mollis</i> near the shoreline, vegetation in disturbed areas had almost recovered. The spread of the species, reproduced by rhizomes, was thought to be the reason for the fast recovery. However, in this zone, except for the areas nearest the shoreline, soil was hardened and running impact remained. The reason the impact on soil did not remain only nearest the shoreline is thought to be that the impacted soil had been buried by accumulated sand carried from the sea along with wind. In the zone dominated by <i>Rosa rugosa</i> farther from the shoreline, the species, which is a naturalized and not present in the undisturbed areas, invaded the disturbed areas. Thus, vehicle running destroyed the zonation of vegetation. The soil hardness was still observed from the surface to a depth of 50 cm. Since sand hardly accumulates in this zone, the impact on soil is considered to remain over the long term, and there is also thought to be the possibility of not recovering to original vegetation.

Journal

  • Journal of the Japanese Society of Revegetation Technology

    Journal of the Japanese Society of Revegetation Technology 28(2), 342-352, 2002-11-30

    The Japanese Society of Revegetation Technology

References:  29

Cited by:  8

Codes

  • NII Article ID (NAID)
    110002912130
  • NII NACSIS-CAT ID (NCID)
    AN10130633
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09167439
  • NDL Article ID
    6373552
  • NDL Source Classification
    ZR21(科学技術--農林水産--林産) // ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z18-1223
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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