불투수층에서 자라는 수목의 얕은 수원 이용 : 안정 동위원소를 이용한 연구

학위논문 (석사)-- 서울대학교 대학원 : 협동과정농림기상학, 2016. 2. 류영렬.Impervious surfaces account for a large proportion of urban land surface. However, little is known about tree water use in impervious surfaces. Here, we compared the water sources of trees growing through impervious and pervious surfaces using oxygen and hydrogen isotopic compositions from stem water and other potential water sources before and during the wet season. The proportion of topsoil water in the water source, calculated using a simple linear mixing model, showed that trees growing through impervious surfaces took up more water from shallow layers than control trees before the wet season. An IsoSource model applied in the wet season confirmed that trees growing through impervious surfaces took most of their water from depths of around 20 cm, while control trees took the greatest portion of their water from a depth of 70 and 100 cm. These findings could improve urban hydrological cycle models and suggest that urban trees growing through impervious surfaces might be more vulnerable to drought.1. Introduction 1 2. Material and Method 3 2.1 Site Description 3 2.2 Sampling and Isotopc Analysis 4 2.3 Water Source Estimation 5 3. Results and Discussion 7 3.1 Isotopic Composition of Rainfall, Stem Water, and Soil Water 7 3.2 Water Sources 14 3.3 Potential reasons for the water source results 17 3.3.1 Soil bulk density 17 3.3.2 Soil temperature and moisture 18 4. Summary and Conclusion 21 References 23 Abstract in Korean 30Maste