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Evaluation of Hydrophilic Polymer on the Growth of Plants in the Extensive Green Roofs

저관리형 옥상녹화 식물생육을 위한 Hydrophilic polymer의 효용성

  • Yang, Ji (Dept. of Green Technology Convergence, Konkuk University) ;
  • Yoon, Yong-Han (Dept. of Forest Science, Graduate School, Konkuk University) ;
  • Ju, Jin-Hee (Dept. of Forest Science, Graduate School, Konkuk University)
  • 양지 (건국대학교 녹색기술융합학과) ;
  • 윤용한 (건국대학교 산림과학과 대학원) ;
  • 주진희 (건국대학교 산림과학과 대학원)
  • Received : 2013.11.20
  • Accepted : 2014.05.23
  • Published : 2014.06.30

Abstract

This study aimed to determine effects of the use of water-retention additive, hydrophilic polymer, for extensive green roofs on growth of Juniperus chinensis var. sargentii and Euonymus fortunei 'Emerald and Gold' for woody plants, and Carex kobomugi and Carex pumila for herbaceous plants. Five different contents of hydrophilic polymer including 0% (Control), 1.0%, 2.5%, 5.0%, and 10% (polymer: medium (w/w), dry weight basis) were added to each of the container filed with a 100 kg of growth medium. Ten of plants were transplanted in each of square container ($1m(L){\times}1m(W){\times}0.3m$ (H)) built on the roof platforms in randomized complete block design in the $20^{th}$ of May, 2013. In results, excessively high volumetric soil water content, about 97-98%, was found in the substrate under elevated hydrophilic polymer concentration of at least 2.5%, during the entire growing period. The moisture content of the substrate containing 1.0% of hydrophilic polymer was higher about 20% in the range between 70% and 80%, compared tho that of Control substrate in the range between 50% and 60%, for 27 days after transplanting prior to abundant rainfall, indicating that the application of hydrophilic polymer to the extensive green roof substrate is effective to eliminate drought condition by retaining water in the substrate. Euonymus fortunei 'Emerald and Gold' and Carex kobomugi resulting in higher plant growth with 2.5% than those of the other treatment plants. Juniperus chinensis var. sargentii was observed the highest growth under 1.0% hydrophilic polymer treatement, and Carex pumila was founded the best growth with Control respectively. Plants that grown in both the 1.0% and 2.5% hydrophilic polymer survived all, while the plants that grown in the 5.0% and 10% hydrophilic polymer died after 3 months. These results suggest that advantage of the addition of hydrophilic polymer may be greater in drought-tolerant plants, but the mixture proportion of hydrophilic polymer should be determined according to the different features of the plant species being grown.

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