수원시 덕영대로의 가로수 건강성 평가 및 주요 영향요인 분석

Analysis of Health Status of Street Trees and Major Affecting Factors on Deogyeong-daero in Suwon

Abstract

The street trees increase the liveability of cities by reducing stormwater runoff, improving air quality, storing carbon, providing shade, and ameliorating the urban heat-island effect. In this study, the health status of street trees in Suwon was evaluated, and the factors affecting the growth of the trees were also derived. In order to evaluate the growth and health of street trees, field survey was carried out on a total of 125 trees in 25 sections of the Deogyeong-daero where is through the city. During the field survey, the following items were examined: Street trees health status (i.e. species, height, DBH (diameter at breast height), planting types, vigor, etc.), soil factors (i.e. soil temperature, humidity, pH, hardness, etc.), and environmental factors (i.e. landuse, road width, etc.). As the results of field survey, the main species of the street trees was Zelkova serrata, which was healthy in most of the sections. The factors such as planting types, soil temperatures, tree root cover, road extension, distance from the road were derived to affect the growth and health of street trees, and the differences were significant. The results of this study were derived the following conclusions for vigorous street trees: First, it is important to install and maintain the protection facilities like tree root cover for the growth of trees. Second, it is necessary to discuss how to plant multiple trees in narrow spaces like a street green space. Third, it is important to provide appropriate soil conditions continuously for growth of threes. Finally, it should be utilized as a mitigation measure of urban heat island effects.

Figure 1. Study area

Figure 2. Street tree species in the study area

Figure 3. Research flow

Figure 4. Electrical resistances according to species and measuring positions

Figure 5. A plot between the class of tree growth and electrical resistance of BH by Junsmeter

Figure 6. Street trees growth by segments

Figure 7. The relationship between soil temperature and tree growth

Table 1. Street tree species of survey areas

Table 2. Class according to range of tree growth

Table 3. Difference in growth according to road expansion

Table 4. Difference in growth according to road extension and type of plant

Table 5. Difference in growth according to installing tree root cover