Evaluation of Ecological Landscape of Road Based on Terrestrial Laser Scanning: A Case Study of Huanghai National Forest Park

The construction of road ecological landscape is an important part of building an ecological garden city, and it is also an indispensable link in landscape planning of urban garden. In this study, the roads with broad-leaved trees and the roads with coniferous and broad-leaved mixed trees in Huanghai National Forest Park in Jiangsu Province were taken as the research objects, and the three-dimensional point clouds data was obtained by the terrestrial laser scanning (TLS). Considering the ecological and landscape benefits, a total of six main indicators were selected, including carbon sequestration, dust retention, humidification, plant aesthetic benefits, plant ornamental benefits and roadside landscape integration. Then, the weight values to each indicator were calculated through the mean square error method, and the road ecological landscape was comprehensively evaluated. The results show that: (1) The evaluation value for the roads with coniferous and broad-leaved mixed trees is 2.44, and for the roads with broad-leaved trees is 0.56, which indicates that for the Huanghai National Forest Park, the roads with coniferous and broad-leaved mixed trees have better ecological landscape benefit. (2) Compared with the traditional methods of manually collecting data on the sample plot, the utilization of TLS can acquire high-quality data and greatly reduce time and labor costs. This study can make a quantitative evaluation of the ecological protection function of street trees, and provide a scientific basis for urban landscape planning.