This study aims to make suggestions and improvement measures for the issues and results of assessment and analysis on species diversity for the purpose of realizing true function of street tress from the point of view of users.
As the function of mo...
This study aims to make suggestions and improvement measures for the issues and results of assessment and analysis on species diversity for the purpose of realizing true function of street tress from the point of view of users.
As the function of modern life gets higher, the function of street trees is expanding. However when the damages in street trees were incurred by disease and insects the opinion that the planting of single species of trees is insufficient is suggested. For Suwon City, it has also the planting of single species of trees and the damages in street trees by diseases and insects are prevented by pesticide. However as it is revealed that the pesticide contains carcinogen-suspicious substance as its main ingredient the pesticide, it is threatening citizens’ health. Therefore, the street trees were investigated in terms of species diversity, as one of solutions to settle out the matter of diseases and insects. Target area is Suwon City and the distribution of species of street trees was investigated by data collection. Then we conducted research for the issues on species of street trees in Suwon City through FANKS.S 30-20-10 principle which is suggested as one of solutions for diseases and insects and Shannon Index by classifying roads. And in order to settle out these problems, the plans for the diversification of species of street trees and equal plantation were made.
As the results of the research, it was revealed that total number of trees which are currently planted in Suwon City were 2,105,940 trees and 96.90% was occupied with shrub among them. When comparing with the numbers by Districts in Suwon City, total 787,486 tress (37.39%) were planted in Kwonsun-District and it meant also that the most trees are planted in Kwonsun-District. In terms of species of trees, it was investigated that standing yew trees in tall evergreen trees are mostly planted as 86.97% occupation, and ginkgo and Elm-like trees are mostly planted in leaf high trees.
And it was turned out that evergreen spindle trees were occupied with 71% in shrub trees. Except those trees mentioned in the above, other species of trees such as yulan, Japanese Maple, Japanese apricot tree, horse chestnut were planted but it was studied that the planted numbers were very few.
In order to do further analysis, the roads that street trees were planted again were divided into ‘Ro,’ ‘Gil,’ and ‘other’ due to the conversion into Road Name Address. After that, the relevant species of trees which falls under its scope were applied to the classified address by road name in accordance with FANKS.S 30-20-10 principle. The species of trees which exceeded its scope followed by the application of FANKS.S 30-20-10 principle are as follows. For Kwonsun-District, it showed 6 families, 7 genera, 14 species and 5 families, 7 genera, 12 species were shown in Youngtong-District. In addition, 6 families, 8 genera, 18 species and 5 families, 7 genera, 12 species were shown in Changan-District and Paldal-District respectively. Based on the above results, the suggested number in accordance with the principle was proposed. And besides, according to each classification, the result values for species number (SR), species richness (RI) and Shannon’s species diversity index (H) and evenness index (E) were indicated for ‘Ro,’ ‘Gil,’ and ‘other.
While for RI in Kwonsun-District, the road of ‘Ro’ type indicated the highest value 201.33 and H and E were shown the highest value 1.19 and 0.307 in ‘other’ type road respectively. For Youngtong-District, RI was shown as the highest value 177.03 in ‘Gil’ type road while H and E were shown the highest value 1.68 and 0.598 in ‘Ro’ type road respectively. Lastly for Paldal-District, RI was shown the highest value 144.68 in ‘Gil’ type road but H was recorded at the highest value 1.27 in ‘Ro’ type road and E was shown the highest value 0.336 in ‘other’ type road.
Therefore, even though the road showed that it has high species richness (RI), it was revealed that it does not have high species diversity index (H) and evenness index (E). Resulting in those indication, it was verified that only a few species of trees were planted compared with species number and also planted unevenly due to many kinds of planting species. And it is estimated that those planting were for the creation of clean and beautiful spectacle.
Even though the results in this study are important and significant, regarding the fact that 30-20-10 principle can’t solve all potential matters of diseases and insects, it is suggested that further study to supplement the limitation of species of trees in this study, that is, considering the properties of soil and local features should be continuously done.