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제주도 하천의 중대가리나무 식생

Adina rubella Phytocoena in Jeju Island, Korea

  • Choi, Byoung-Ki (Department of Molecular Biology, Dongeui University) ;
  • Ryu, Tae-Bok (Department of Biological Sciences, Keimyung University) ;
  • Kim, Jong-Won (Department of Biological Sciences, Keimyung University)
  • 투고 : 2015.03.17
  • 심사 : 2015.03.27
  • 발행 : 2015.03.31

초록

화산섬 제주도 하천에는 버드나무류 (Salix spp.) 연목림 식생은 존재하지 않는다. 대신에 일부 하천 구간에서 유전적 고립개체군으로서 중대가리나무 식생이 발달한다. 그럼에도 획일적인 하천정비사업으로 중대가리나무의 현존 서식처 및 잠재 서식 공간이 크게 위협받고 있다. 본 연구는 중대가리나무 식생에 대한 군락분류 및 군락생태를 규명하였다. 중대가리나무가 분포하는 전역에 대하여 전통적인 식물사회학적 방법으로 전수조사를 실시하였다. 총 91개 지점에서 11개 식생조사표(phytosociological relev$\acute{e}$)를 획득하였고, 기발표 자료 (식생조사표 총 16개)를 수합하여 비교분석하였다. 종조성의 질적 양적 유의성 분석은 PCoA (Principal coordinates analysis)를 이용한 좌표결정을 수행했다. 본 연구에서는 산철쭉에 대한 군락분류 및 군락지리를 근거로 산철쭉-중대가리나무군집 (Adino-Rhododendretum poukhanensae Itow et al., 1993)을 폐기하고, 중대가리나무-교래잠자리피군집 (Tripogono-Adinetum rubellae ass. nova hoc loco), 중대가리나무군단 (Adinion rubella all. nova hoc loco)을 새로이 기재하였다. 본 단위식생은 제주도 서귀포생태역의 간헐천(間歇川, ephemeral stream) 물길구간내에서 지하수와 완전 격리된 하천식생형(partly ombrotrophic vegetation in ephemeral stream)으로 규정되었다. 한반도 내에서의 대응식생형으로 산철쭉군단 (Rhododendrion poukhanensae Lee, 2004 ex. hoc loco)을 기재하고, 갯버들-달뿌리풀군단 (Phragmito-Salicion)과의 명백한 상이성을 기재했다. 중대가리나무 식생은 제주도 고유의 식생자원으로 절대감시 1급 국가식생자원의 절대(absolute)감시 보존 대상으로 보호대책이 요청되었다.

There is no willow riparian vegetation in Jeju Island, Korea. Instead, a genetically-isolated population of Adina rubella is found in some parts of the riparian system. We describe its syntaxonomy and synecology. A total of 27 phytosociological relev$\acute{e}$s were collected, 11 relev$\acute{e}$s from 91 sites and 16 relev$\acute{e}$s from the previously published relevant materials. Data were analyzed by traditional Braun-Blanquet method and multivariate PCoA (Principal coordinates analysis). New syntaxa are distinguished, Adinion rubellae all. nov. and its type association Tripogono-Adinetum rubellae ass. nov. with two subassociations, typicum and rhododendretosum poukhanensae. Adino-Rhododendretum poukhanensae Itow et al. 1993 was discarded owing to mismatch of syntaxonomy and syngeography of Adina and Rhododendron phytocoena. The alliance Adinion is Jeju's regional and partly ombrotrophic vegetation occurring in pothole and rock crevice where are independent on ground-water table. We also suggest a revised alliance, Rhododendrion poukhanensae Lee 2004 ex. hoc loco in Korean peninsula, as a corresponding syntaxon to Adinion, which completely differs from Phragmito-Salicion. Finally we pointed out that Adina phytocoena requiring an absolutely monitoring has been threatened by river maintenance project of local government.

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