Cold Tolerance of Ground Cover Plants for Use as Green Roofs and Walls

옥상 및 벽면녹화용 지피식물의 내한성 비교

  • Ryu, Ju Hyun (Department of Horticultural Science & Biotechnology, Seoul National University) ;
  • Lee, Hyo Beom (Department of Horticultural Science & Biotechnology, Seoul National University) ;
  • Kim, Cheol Min (Korea Urban Forestation Co., Ltd.) ;
  • Jung, Hyun Hwan (Department of Horticultural Science & Biotechnology, Seoul National University) ;
  • Kim, Ki Sun (Department of Horticultural Science & Biotechnology, Seoul National University)
  • 류주현 (서울대학교 농업생명과학대학 식물생산과학부) ;
  • 이효범 (서울대학교 농업생명과학대학 식물생산과학부) ;
  • 김철민 (한국도시녹화(주)) ;
  • 정현환 (서울대학교 농업생명과학대학 식물생산과학부) ;
  • 김기선 (서울대학교 농업생명과학대학 식물생산과학부)
  • Received : 2014.02.27
  • Accepted : 2014.04.29
  • Published : 2014.10.31


This study was conducted to compare the cold tolerance of seven ground cover species, Orostachys japonica, Sedum oryzifolium, S. kamtschaticum 'SG1', S. reflexum, S. rupestre 'Blue Spruce', S. spurium 'Green Mental', and S. takesimense, which have been used for green roof and wall systems in Korea. Plants were grown in 10-cm pots and 1 g of tissues at stem-end and crown of each species were kept under either light or dark condition, respectively. For cold tolerance tests, plants were initially left at $4^{\circ}C$ and linearly cooled to 0, -4, -8, -12, -16, and $-20^{\circ}C$ at $-2^{\circ}C{\cdot}h^{-1}$ rate. Low temperature injury and regrowth rates were visually evaluated and assessed by image analysis, respectively. The lethal temperature ($LT_{50}$) of plant species was determined using electrolyte leakage measurements. S. reflexum was the most cold tolerant, showing the most survival at $-16^{\circ}C$, whereas S. oryzifolium and S. takesimense showed low temperature injury at $-8^{\circ}C$. Similar results were found with electrolyte leakage measurements at the stem end. For each species, the crown (Mean $LT_{50}:\;-12.15^{\circ}C$) was more cold tolerant than the stem end (Mean $LT_{50}:\;-10.47^{\circ}C$). In conclusion, S. reflexum and S. rupestre 'Blue Spruce' are recommended for planting in the central region of Korea during late fall and early winter, as they were more cold tolerant and showed more vigorous regrowth than the other tested plant species.


Supported by : 농림축산식품부 농림수산식품기술기획평가원


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