This study focused on the characteristics of change soil water with respect to soil thickness and soil mixture ratio, in order to effectively carry out an afforestation system for a roof with a low level of management and a light weight. Soil hardness tended to increase as sand particle was increase regardless soil thickness and soil porosity had more higher artificial soil than natural soil mixture. In case of soil pH, natural soil mixture had between 6.7 and 7.4, and artificial soil mixture had 6.0∼6.8. Organic matter, electrical conductance and exchangeable content were highest in L10, which it had the highest leafmold ratio.
Soil moisture tension(kPa) in 15cm soil thickness was observed natural soil mixture had a considerable change but artificial soil mixture had a gradual change when non-rainfall kept on. In the experimental L10, S10, S7L3 and S5L5 object, the amount of moisture tended to rapidly decrease. However, in the experimental P7P1L2, P6P2L2, P5P3L2 and P4P4L2 objects, which contained pearlite and peat moss, the amount of moisture tended to gradually decrease. As a result, the use of a artificial soil mixture soil seems to be required for the afforestation of a roof for a low level of management.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 실험구 및 식재기반 조성
  2.2. 측정방법
 3. 결과 및 고찰
  3.1. 식재지반의 물리․이화학적 특성
  3.2. 15 cm 토심에서 토양배합비에 따른 토양수분장력변화
  3.3. 토양용적수분변화
 4. 결 론
 참 고 문 헌

• 박준석(아세아환경조경 대표) | Jun-Suk Park (Chief Executive Officer, Asia Environment Landscape Co.)
• 박지혜(건국대학교 산림과학과) | Je-Hea Park (Department of Forest Science , Konkuk University)
• 주진희(건국대학교 산림과학과) | Jin-Hee Ju (Department of Forest Science , Konkuk University)
• 윤용한(건국대학교 산림과학과) | Yong Han Yoon (Department of Forest Science , Konkuk University) Corresponding Author