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西安市城市化进程对生态系统服务功能的影响研究
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摘要
本文选择具有典型性和代表性的西安市为研究对象,应用生态学和现代地理学理论和方法,以遥感影像数据、社会经济统计数据和其他相关资料为基础,结合RS、GIS技术,对西安市1988、2000和2007年的城市化水平和生态系统服务价值进行评估及等级划分,通过对时空差异的对比分析,揭示城市化进程对生态系统服务功能的影响规律。上述研究是城市化影响生态系统研究的一个重要方面,对揭示城市化与生态系统之间的作用关系具有重要的科学意义,为未来城市化发展规划提供决策依据,为进一步协调快速城市化区域城市发展与生态系统之间的关系、保护生态安全提供科学理论指导。
     通过分析研究,得出以下结论:
     1、从整体上看,西安市综合城市化水平主城区远远高于其他区县,其次是阎良区,其余各区县的综合城市化水平较低;1988—2007年,西安市各区县的综合城市化水平都在不断提高,提高最多的是主城区,由39%增长到66.6%,发展最缓慢的是蓝田县,由4.9%增长到7.6%;城市化发展在空间上表现出明显的不均衡性,城市首位度高。
     2、1988、2000和2007年西安市生态系统服务价值总量分别为10.988亿元、8.87亿元和9.585亿元,总体上呈现波动趋势;西安市生态系统单项服务价值由大到小依次为土壤形成与保护>生物多样性维持>气体调节>气候调节>废物处理>水源涵养>原材料生产>休闲娱乐>食物生产。
     3、在空间上,西安市南部的秦岭中山地区、太白高山地区以及主要河流分布区,生态系统服务价值最高;而秦岭中低山灌丛带低洼地区以及部分的黄土台塬地区,生态系统服务价值较高;北部大面积的河谷平原地区以及东面的低山丘陵地区的生态系统服务价值较低;主城区以及周围城镇和工矿分布区,人类生产活动对生态系统服务功能的负面影响较强,生态系统服务价值最低。
     4、西安城市化水平较高的主城区和周围城镇的生态系统的生产功能较低,其他地区的生态系统的生产功能相对较高。西安市城市化水平与生态系统生态功能成反比,主城区城市化水平最高,但生态功能最低;南部大部分地区城市化进程相对缓慢,但生态系统生态功能最高;北部平原和丘陵地区的城市化水平中等,生态系统生态功能受城市化发展的冲击相对较少,生态系统生态功能也较高。西安市城市化水平对生态系统文化功能的影响特征是城市化水平较低的南部秦岭中低山地区,其生态系统娱乐文化功能较高,但随着城市化水平的提高,娱乐文化功能在不断下降;城市化水平较高的北部平原、丘陵地区,其生态系统娱乐文化功能较低,只在水域分布地区,如渭河、灞河、黑河等地区的自然生态系统的娱乐文化功能相对较高。
     本文的创新点如下:
     (1)国内外关于城市化与生态系统的关系研究成果较多,但从城市化进程对生态系统服务功能的影响研究很少,本文从定量化的角度、综合全面的分析城市化进程对生态系统服务功能的影响过程。(2)通过城市化发展对每一项生态系统服务功能的影响研究,总结城市化进程中人口增长、经济发展和空间变化对生态系统各项服务功能的有利或不利影响及影响大小。(3)运用RS和GIS工具,把西安市划分为1KM×1KM的格网,从栅格尺度对城市化进程对生态系统服务功能进行精细研究。
The typical takes Xi'an city district as an example, applying the theory and method of ecology and modern geography, using remote sensing data and social -economic statistical data and other related information, at the same time, combining RS and GIS technology, and evaluates the urbanization level and the ecosystem services value in Xi'an city. Through the contrastive analysis of the time and space, in order to reveal the response mechanism of urbanization and ecosystem service function. The research of urbanization and ecological system is very important,which can offer decision-making basis for future planning and provide scientific theory guidance to ecological security protection.
     Through analysis, the paper concluded:
     First:The integrated urbanization level far above other counties in Xi'an city, followed by the rest of the Yan'lang. From 1988 to 2007, the comprehensive urbanization level is enhanced in Xi'an city, for example the main city increases by 27% and the Lan'tian increases by 2.7%.At the same time, the development of urban is imbalance.
     Second:The change trend of ecosystem services value is fluctuates in Xi'an city from 1988 to 2007, and the value is 10.988 billion yuan in 1988 and 9.585 billion yuan in 2007, at the same time, the function of soil formation and protection is highest and the function of food production is lowest in Xi'an city.
     Third:In the space, the ecosystem services value is highest in the southern of Qin'ling and Tai'bai mountains and major rivers area. The ecosystem services value is higher in Qin'ling low shrubs and other loess tableland area. The ecosystem services value is low in the northern plains. Because human activities caused negative influence to the ecosystem, the ecosystem services value is lowest in the main city and surrounding towns.
     Forth:The city which has the highest level of urbanization is the lowest production function, and the city which has the slower level of urbanization is the highest production function. Urbanization level and the ecosystem service value is inverse proportion. The ecological functions is lowest in the highest level of urbanization, and the ecosystem function is highest in the southern of Xi'an, which has the lower urbanization level, and the northern plains and hilly area which is medium level in urbanization level is medium level in ecosystem function. The development of urbanization causes ecosystem entertainment culture function change:the entertainment culture function is higher in low level of urbanization, but with the improvement of urbanization, the entertainment culture function decreases; the entertainment cultural function of ecological system is lower in higher of urbanization.
     This innovation points as follows:
     (1)The research of the relationship between urbanization and ecological system is more, but the research on the relationship between urbanization and ecosystem service function is less. This paper study the process between urbanization and ecosystem service function.
     (2) Through the study of the Impact process between urbanization and ecosystem service func-tion, this paper summarized influence factors in population growth and economic development and spatial expansion.
引文
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