特集「シカの採食圧による植生被害防除と回復」:ニホンジカ高密度化に対する脆弱性とRDB 掲載種からみた植物群落の保全危急性評価  [in Japanese] SPECIAL ISSUE “ Protection and Restoration of Vegetation Damaged by Deer Grazing ”:Evaluating the conservation emergency of plant communities by vulnerability to the Sika deer over-abundance and endangered species  [in Japanese]

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Abstract

シカの高密度化による植生への影響は,生態系機能や他の分類群への影響より早い段階から発生しやすいため,地域スケールで植物相を保全するには,影響が軽微な段階から予防的な対策を行うことが望ましい。保全に費やせる社会的資源が有限ななかで予防的な対策を行うには,地域の植物相を維持するうえで重要な場所を特定し,その優先順位を計画に盛り込む必要がある。本研究では秩父多摩甲斐国立公園において198 地点の植生調査資料をもとに,出現種を「シカ高密度地域での減少種/その他」「RDB 掲載種/非掲載種」の組み合わせから「減少種・RDB 掲載種(A) 」「減少種・RDB 非掲載種(B)」「その他・RDB 掲載種(C)」「その他・RDB 非掲載種(D) 」に区分し,各グループの総種数に対する占有率とシカの相対密度指標の関係を検討した。グループB はシカの相対密度指標の増大とともに減少したのに対し,グループD の種は増加した。また,グループC は相対密度指標の増大に対し一山型の応答を示した。群落型ごとの比較からグループA・B の占有率が高い亜高山帯~ 山地帯の草原や広葉高茎草本型のブナ林,シオジ林の保全危急性が最も高いと考えられた。

Since the overabundance of Sika deer has potential to cause irreversible shift of ecosystem, proactive management from early stage would be desirable. To conduct proactive management under the limitation of resource in terms of funds and labors for biological conservation, it is necessary to specify the area with high priority to conserve regional flora, and incorporate it into the management plan. We used 198 phytosociological releves derived from Chichibu-tama-kai National Park, and divided all recorded species into 4 groups by 2 criteria: “decreased species in the area with high deer density” and “endangered species in national and local government scale” . The species in Group A is “decreased and endangered” Group B is “decreased but not endangered”, Group C is “not decreased but endangered” and Group D is “neither decreased nor endangered”. We compared the relationship between proportion of each species groups and relative deer density indices. Proportion of Group B had rapidly decreased with relative deer density index increase, while proportion Group D had increased. Proportion of Group C showed unimodal response to relative deer density index. Proportion of Group A and B was high in the grassland and montane broadleaf forests with tall herb understory. Conservation emergency of these community types seem to be highest in the Chichibu-Tama-Kai National Park.

Journal

  • Journal of the Japanese Society of Revegetation Technology

    Journal of the Japanese Society of Revegetation Technology 39(4), 512-520, 2013

    JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY

Codes

  • NII Article ID (NAID)
    130004923358
  • NII NACSIS-CAT ID (NCID)
    AN10130633
  • Text Lang
    JPN
  • ISSN
    0916-7439
  • NDL Article ID
    025599678
  • NDL Call No.
    Z18-1223
  • Data Source
    NDL  J-STAGE 
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