摘要
以重庆市万州区为研究区,以生物多样性为切入点,综合运用形态学空间格局分析(MSPA)和最小累积阻力模型(MCR),识别GI网络中心(hubs)和连接廊道(links),结合图论、电路理论及几何形态学划分重要性等级,提取廊道上的生态夹点区域,并针对山地城镇的典型生态问题提出对应的精细化保护与修复策略。结果表明:1)万州区内网络中心42处,总面积996.35 km^(2),占研究区总面积的28.83%,总体“东密西疏”,形成“一屏三带、散点分布”的格局;2)连接廊道80条,总长度292.97 km,呈现“东强西弱、东短西长”的分布特征;3)生态夹点142处,占廊道长度的9.60%,主要分布于东部。据此,将网络中心分为连绵涵养区、重点保护区和独立修复区制定分区修复策略;将连接廊道分为关键廊道、重要廊道和一般廊道制定分级修复策略;对不同用地类型组合方式的生态夹点区域制定精准修复策略。
The conflict between ecological protection and town development is particularly pronounced in mountainous towns with fragile ecological environments and constrained construction conditions.Cross-scale Green Infrastructure(GI)is characterized by a balance between ecological protection and human needs.The establishment of a county-level GI network can provide a shared basic framework for the development and biological conservation of mountainous towns.The Wanzhou District of Chongqing has the typical characteristics of a southwestern mountain town with ecological problems such as habitat fragmentation and reduced disturbance resistance.This study was based on the biological flow process,guided by geometric morphology,circuit,and graph theory,and it followed the logic of"hubs,links,and pinch points".First,the morphological spatial pattern analysis method was applied to identify the GI network hubs,and their importance was classified according to the current-flow betweenness centrality index.Next,an ecological resistance surface was established based on multisource data,and the minimum cumulative resistance model was applied to identify the links.It also calculated their importance and ranked them based on the average resistance,path length,and average value of the connected hubs.Subsequently,the current-flow density distribution was analyzed,and ecological pinch points were extracted in conjunction with the links.According to the results,the GI network of Wanzhou District contains 42 hubs with an area of 996.35 km^(2),accounting for 28.83%of the total study area.The hubs were generally dense in the east and sparse in the west,forming a pattern of"one screen,three belts,and scattered distribution."Among them,the GI network hubs formed by the Fangdou-Qiyao Mountain group and the Yangtze River and its coastal green areas are of the greatest importance,followed by the Tiefeng Mountain,Dengfeng Reservoir,and the central-eastern forest areas,whereas the small patches scattered in the central southwestnortheast oriented valleys are of the least importance.Additionally,80 links were identified with a total length of 292.97 km,with long paths and low importance in the eastern region and short paths and high importance in the western region.Furthermore,142 ecological pinch points were extracted,accounting for 9.60%of the corridor length dominated by land-use types of farmlands(55.89%)and woodlands(35.71%);pinch points were mainly concentrated in the east,which is the key area in guaranteeing the ecological stability of the county GI network.Finally,this study proposes zoning,grading,and precise protection and restoration strategies based on the relative importance of hubs and links and the land-use types of ecological pinch-point areas.These strategies provide a scientific basis for decision-making to coordinate the conservation and development needs of mountain towns.
作者
汪子茗
吕梁
汪峰
Wang Ziming;Lyu Liang;Wang Feng(College of Architecture and Urban Planning,Chongqing Jiaotong University,Chongqing 400074,China;School of Architecture and Urban Planning,Chongqing University,Chongqing 400044,China)
出处
《热带地理》
CSCD
北大核心
2024年第2期303-314,共12页
Tropical Geography
