|Table of Contents|

Temporal and spatial changes of road grid and landscape ecological risks in high altitude plateaus based on weighted kernel density(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年4期
Page:
118-128
Research Field:
交通工程
Publishing date:

Info

Title:
Temporal and spatial changes of road grid and landscape ecological risks in high altitude plateaus based on weighted kernel density
Author(s):
YANG Ruo-xin1;  ZHANG Jing-xiao2;  CAO Shu-wen2;  CHEN Yu-han3;  CHENG Li-yuan2
(1. Shaanxi College of Communication Technology, Xi'an 710018, Shaanxi, China; 2. School of Economics and Management, Chang'an University, Xi'an 710064, Shaanxi, China; 3. Shaanxi Xingtong Supervision and Consulting Co. Ltd., Xi'an 710061, Shaanxi, China)
Keywords:
road engineering;  road network pattern;  weighted kernel density;  high altitude plateaus;  landscape pattern;  ecological risk
PACS:
U491.9
DOI:
10.19721/j.cnki.1671-8879.2023.04.012
Abstract:
Aimed at the problem that current research on landscape ecological risk mostly focuses on cities or river basins, while the landscape ecology in high altitude areas of the plateau was more fragile, and the development of road networks was likely to lead to the problems of regional landscape fragmentation and changes in landscape ecological patterns, thus affecting the quality of the ecological environment in the region. The impact of road network expansion on landscape pattern along the route and the change of its ecological risk were studied in Lhasa City, Tibet Region, with the support of geographic information system(GIS), and weighted kernel density estimation(WKDE), ecological footprint modeling, landscape index analysis method, and spatial analysis method were used. A landscape ecological risk model of Lhasa City was constructed based on the landscape pattern, and the spatial and temporal changes of the road network pattern and landscape ecological risk in the region were studied for two periods, 2012 and 2020. The results show that the weighted kernel density analysis can more realistically reflect the actual condition of the road network and its ecological impacts in the high plateau and high altitude areas. The road network expansion led to a rapid increase in the area of construction land as well as a decrease in the area of cultivated land, with little impact on other landscape types. The road network expansion in Lhasa City contributes to the ecological pressure, and the differences in the landscape ecological risk changes caused are closely related to the topography, which is mainly manifested in the decrease of the risk level of the urban centers at low altitude. As the ecological risk level rises, the length percentage of roads of each level in the study area shows a tendency of increasing and then decreasing, which indicates that there is a certain correlation between landscape ecological risk and road level. The research results have certain reference value for road network planning and ecological management in high plateau and high altitude areas, can provide theoretical and technical support for ecological restoration work along roads in related areas, and will also provide reference for future empirical research in the important field of high plateau and high altitude environmental engineering.4 tabs, 9 figs, 41 refs.

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Last Update: 2023-08-20