Evaluating the influence of road networks on landscape and regional ecological risk-A case study in Lancang River Valley of Southwest China
Evaluating the influence of road networks on landscape and regional ecological risk-A case study in Lancang River Valley of Southwest China
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DOI：
10.1016/j.ecoleng.2008.07.006
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发表时间：
2008-09-02
影响因子：
3.8
通讯作者：
Holt, K.
中科院分区：
文献类型：
--
作者：
Liu, S. L.;Cui, B. S.;Holt, K.
采用GIS缓冲区分析、空间对比分析和情景分析等方法，研究了澜沧江流域道路对景观的影响。结果表明，近20年来，研究区林地和灌木林地减少，耕地和建设用地增加。道路附近生态系统的变化速率增大，而多样性均匀度、斑块密度和人为干扰指数均减小。公路发展的不同方面对环境产生不同的负面影响。在澜沧江流域，森林受公路网发展的影响最大，虽然也有负面影响的草地，农田或灌木丛土地，这些差异因道路类型而异。情景分析表明，随着道路网密度的增加，生态系统的分维指数、斑块数和平均斑块面积逐渐减小。生态风险分析表明，不同类型的公路对生态风险的影响程度不同，公路密度与县域生态风险水平呈正相关关系。不同等级公路存在不同的生态风险水平。应考虑完整的路网数据（密度、等级），以避免低估生态效应。(C)2008 Elsevier B.V保留所有权利。
In this paper, the methods of GIS buffer, spatial comparison, and scenario analysis were used to elucidate the influence of roads on landscape within Lancang River Valley. The results showed that forest and shrub land decreased while farmland and constructed land increased in the past 20 years in the study area. Also, the ecosystem's change rate near roads increased while the diversity evenness, patch density and human disturbance indices all decreased. Different aspects of road development had different negative consequences for the environment. In Lancang River Valley, forests were most affected by road network development, although there were also negative affects for grassland, farmland or shrub land and these differences varied by type of road. The greatest effects for forests were observed near high-level roads, while the greatest effects for farmland occurred near the low-level roads, Scenario analysis showed that the fractal dimension index, patch numbers, and average patch area of ecosystems decreased with development of road network density. The ecological risk analysis showed that various type roads cause different risk levels and that road density has a positive relationship with regional ecological risk level at county scale. Also, different ecological risk level exists in different level roads. Full road network data (density, level) should be considered to avoid the underestimate of the ecological effects. (C) 2008 Elsevier B.V All rights reserved.