| 摘要: |
| 对城市绿地进行科学评价有助于人们正确认识和改造城市绿地建设，为城市绿地规划和管理提供参考。以2007—2016年嘉峪关市城市绿地为研究对象，从数量、结构、功能三个方面构建评价指标体系，通过障碍度模型，识别影响城市绿地生态水平的障碍因子。结果表明：（1）10 a来嘉峪关市城市绿地生态水平整体呈波动上升趋势，级别由较低等级提高到高等级，但目前城市绿地生态水平属于低层次、不稳定的高等级阶段，城市绿地建设工作压力还很大。（2）从准则层看，嘉峪关市城市绿地生态水平的主要威胁变化较为明显，数量指标和结构指标是主要障碍因子；从指标层看，各年份主要障碍因子不尽相同，最大障碍因子历经了从人均公园绿地面积、树种丰富度到净化空气能力的演变。 |
| 关键词: 城市绿地 绿地生态 障碍度模型 嘉峪关市 |
| DOI：10.7515/JEE192039 |
| CSTR：32259.14.JEE192039 |
| 分类号: |
| 基金项目:国家自然科学基金项目（41961029，41161028） |
| 英文基金项目:National Natural Science Foundation of China (41961029, 41161028) |
|
| Ecological evaluation and obstacle factor analysis of urban green space in Jiayuguan from 2007 to 2016 |
|
MA Yaxiong, ZHANG Zhibin, DA Xiaojun, DONG Jianhong, ZHENG Lan
|
|
1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
2. Northwest Research Institute of China City Development Academy, Lanzhou 730000, China
|
| Abstract: |
| Background, aim, and scope The evaluation of urban green space can provide important support for the scientific planning and management of urban green space and realize the sustainable development of urban green space. The division of health level of green space can provide important information for the management strategy of green space, such as species selection and adjustment of vegetation structure, etc. The analysis of greenland vegetation ecological risk sources and the classification of risk levels can alleviate or eliminate stressors for green areas, and on the other hand, formulate corresponding countermeasures for green space health, providing important information for rational planning and management of green space in the next step. By constructing the urban green space ecological evaluation index system, the paper makes a scientific evaluation of the urban green space in Jiayuguan City, and uses certain models to identify the influencing factors affecting the ecological level of the urban green space. It is hoped that people will correctly understand and transform the urban green space construction as a follow-up city. Green space planning and management provide theoretical references. Materials and methods With the urban green space of Jiayuguan City from 2007 to 2016 as the research object, the ecological evaluation index system of urban green space is constructed from three aspects, and the obstacle degree model is adopted to identify the obstacle factors that affect the ecological level of urban green space. Results In the past 10 years, the comprehensive value of urban green space ecological level of Jiayuguan City has gradually increased, and the level has been raised from the lower level to the higher level. However, at present, the ecological level of urban green space belongs to the low level and unstable high level, and the construction pressure of urban green space is still great. From the perspective of criteria, the main threats to the ecological level of urban green space in Jiayuguan are obvious, and the quantity index and structure index are the main obstacles. From the index level, the main obstacle factors are different from year to year, and the biggest obstacle factors have evolved from per capita park green space area, tree species richness to air purification capacity. Discussion Urban green space evaluation initially focused on green space structure and ecological function, then gradually expanded to green space ecological services, ecological health level and ecological risk, and finally developed to sustainability evaluation. Urban green space more attention in the study of urban green space’s ecological functions and ecosystem services, and concentrated in the eastern central region, based on “oasis” Jiayuguan City green space as the research object, from the aspects of quantity, structure, function of three comprehensive evaluation of the urban green space ecology level, using the disorder degree model to identify the obstacle factors of the development of urban green space, for the improvement of other urban ecological problems in arid areas provides a certain reference. Conclusions From 2007 to 2016, the ecological level of urban green space in Jiayuguan City gradually increased to a low-level, unstable high-level order. The barrier factors varied greatly in different years, and the biggest obstacle factor experienced the evolution from per capita park green area, tree species richness to air purification capacity. Recommendations and perspectives The urban green space evaluation initially focused on the green space structure and ecological function, and subsequently expanded to the green space’s ecological service, ecological health level and ecological risk, and finally developed to sustainability evaluation. At present, the research on urban green space pays more attention to the ecological function and ecosystem service of urban green space, and concentrates on the eastern and central regions. The article takes the urban green space of Jiayuguan in the “desert oasis” as the research object, and comprehensively evaluates it from three aspects: quantity, structure and function. The ecological level of urban green space, using the obstacle model to identify the obstacle factors that restrict the development of urban green space, provides a reference for the improvement of ecological problems in other cities in the arid region. |
| Key words: urban green space green space ecology obstacle model Jiayuguan City |
