干旱区地理2011，Vol.34Issue(4)：662-670,9.
基于空间PCA的兰州市热环境人文驱动因素分析
Simulation and analysis of human dimensions of urban thermal environment in valley-city:a case study of LanZhou City
摘要
Abstract
Urbanization is followed with a series of physical, ecological and social processes. The formation and e-volution of urban thermal environment, which are closely related to changes of land cover and socioeconomic activities of human being in urban area, can generalize and embody urban ecological environment condition. Distribution and evolution of urban thermal environment is relevant to interactions of human activities such as the change of underlying surface, anthropogenic heat emission and environmental pollution. Due to the complexity of factors contributing to urban thermal environment, the routine observing methods and statistical methods are insufficient in acquiring data and analyzing the responses of human activities to thermal environment, especially discerning the major at-tributors from the others. Existing research efforts on the driving mechanism of urban thermal formation and evolution have been mostly focused on the measurement of a single or several indicators representing land cover changes, socioeconomic conditions, etc. There is still lack of a comprehensive analysis with respect to surface thermal environment system from a regional perspective. In the recent fifty years, urbanization of Lanzhou City,Gansu Province is in a quick increasing period. Comparing to the plain cities, Lanzhou's integrated effects include the artificial and original influence factors bringing about the prominent and particular hot island effects. So it is necessary to research on the temporal-spatial characteristics and formation mechanisms of thermal environment in Lanzhou. Based on Landsat TM images and taking the arid valley urban area of Lanzhou as a case study, this paper employed Spatial Principal Component Analysis (SPCA) method to analyze the spatial pattern and the influencing factors of urban thermal environment as a substitute of Multi-Criterion valuation ( MCE) method. Several conclusions have been drawn as follows: There are four primary factors to influence the density and spatial pattern of urban environment in Lanzhou, which can be generalized as landscape pattern, allocation of industries, urban construction density and types of underlying surface. The cumulative variance contribution rate of the first four principal components is 91.27%. It is dissimilar in the formation mechanism of thermal environment among all the zones through comparing four principle components. The linear model including the four independent variables could reveal the response mechanism of human activities on thermal environment in Lanzhou. Differing from other cities, landscape pattern is regarded as the most sensitive factors to Lanzhou's thermal environment among these factors, whose variance contribution was up to 48.42%. Furthermore, the difference in. Spatial distribution of the main factors facilitates the formation of the diverse urban thermal environment in different areas. The results would be valuable to simulate spatial change of urban thermal environment and even put forward countermeasures to lessen the urban thermal environment intensity for policy makers, at the same time can also support the decision for urban planning, urban constructing, environment protecting and regional sustainable development in Lanzhou city.关键词
城市热环境/人文影响因素/空间主成分分析/干旱河谷型城市/兰州Key words
urban thermal environment/ human dimensions/ spatial principal component analysis/ .arid valley-city/ Lanzhou City分类
资源环境引用本文复制引用
潘竟虎,李宝娟..基于空间PCA的兰州市热环境人文驱动因素分析[J].干旱区地理,2011,34(4):662-670,9.基金项目
国家自然科学基金(41061017) （41061017）
西北师范大学知识与科技创新工程项目(NWNU-KJCXGC-03-60) （NWNU-KJCXGC-03-60）
