Optimization of Ecosystem Services of Shanghai Urban–Suburban Street Trees Based on Low-Carbon Targets

Abstract

Road traffic carbon emissions are an important cause of global warming, and street trees play an important role in regulating road carbon emissions. During urbanization, major differences in the planting management modes and growth status of the street trees in urban–suburban gradient may exist, leading to significant differences in the low-carbon values of the street trees in urban–suburban gradient. Based on this, this study took two typical urban–suburban gradient zones in Shanghai as an example to analyze the changes in the characteristics of street tree species, planting density, tree sizes, and low-carbon contribution with urban and rural changes, and proposed strategies for optimizing the low-carbon contribution of urban street trees. The results showed that, from the inner ring to the outer ring and the suburban ring, the proportion of London plane tree gradually changed from 82% to 11%, and the proportion of the camphor tree gradually changed from 9% to 70%; the average DBH of the trees gradually decreased from 28.81 to 23.74 cm. The number of plantings per unit road length gradually increased, and the number of plantings per unit area gradually decreased; therefore, the average low-carbon contribution of urban–suburban street trees is not significant, but the low-carbon contribution of upper street trees per unit area is higher, and suburban unit street trees have a higher low-carbon contribution. Finally, this article proposes different optimization strategies for future urban micro-renewal and suburban new-city construction.

Water Ecotourism Route Recommendation Model Based on an Improved Cockroach Optimization Algorithm

“…For the whole tour route, PRA produced the smallest amount of waste gas, whereas 360A produced the largest amount of waste gas. 3 Finding three: the control group algorithms BDA and 360A produced more exhaust gases than PRA, and the different volume values between the control group algorithms and PRA were different in each subsection, reaching the maximum for the whole tour route.…”

“…It shows that the collected once-visited scenic spots, regarded as the original data for constructing the recommendation algorithm in this paper, can reflect the different interest tendencies of tourists and ensure that the recommendation algorithm can output the matched scenic spots. 3 Finding three: the functional attribute-weighted value influenced the attribute's capacity for regulating the recommendation result.…”

“…For individual tourists, the choices regarding tourism transportation modes are random. How to reduce the exhaust emissions in tourism activities is the key issue of ecotourism research [3][4][5]. The majority of scholars have completed much work on ecotourism route research.…”

Are Ecosystem Services Provided by Street Trees at Parcel Level Worthy of Attention? A Case Study of a Campus in Zhenjiang, China

“…They found that urban street trees are a fragile resource, but the economic value they provide is higher than the management costs. Chen et al [23] investigated the differences in the carbon value of graded street trees along an urban-suburban gradient in Shanghai, China. They found pronounced differences in the carbon reduction contributions between urban and suburban street trees and recommended that special attention be paid to the local degree of urbanization in future construction projects.…”

Research on Ecological Compensation for Construction Land from a Carbon Emission Perspective

“…At present, research on carbon emissions mainly focuses on quantitative and spatiotemporal analysis of land using information technology such as RS (remote sensing) and GIS (geographical information system) [15][16][17][18][19] . Research on carbon-emitting regions has mainly concentrated on provinces and hot cities [20][21][22][23][24] .…”