基于EFM修正的城市生态空间服务价值评价模型

The Modified Evaluation Model of Urban Ecological Space Service Value Based on EFM

科学认识生态系统服务价值是构建城市生态格局的基础性工作。针对自然生态系统空间场景,等效因子法基于1个国家甚至全球平均水平的价值当量开展评估,是国内外较为公认的生态系统服务价值评估方法。城市人类活动集中,生态系统服务的时间动态性和空间异质性特征明显,但适应城市场景的生态空间服务价值评价的研究成果相对较少,更未形成统一的定量测算方法。根据天府新区规划建设实践需求,通过文献调查,结合专家访谈,在等效因子法的基础上,开展了基于城市场景的生态系统服务价值理论和实践研究,主要包括确定了5个自然地理和3个社会经济因素修正系数,对基础当量表进行时间动态性、空间异质性的价值修正,结合各类生态系统的面积A_(j)及1标准当量的价格D值,建立了同时受自然地理和社会经济两方面突出影响的城市地区生态空间服务价值动态评价模型。研究结果为天府新区基于生态空间服务价值量化评价的规划选址及空间布局提供了科学依据,以期为城市生态空间绩效评估、生态价值转化、生态空间格局优化提供理论支撑,助力生态文明建设国家战略的实施。

Scientific understanding of ecosystem service value is essential for constructing urban ecological pattern.The equivalent factor method based on the average equivalent value at national or even global levels is widely used in assessing ecosystem services in natural ecological spaces.However,in urban spaces with human activities concentrated,ecosystem services with dynamics and spatial heterogeneities gain much less attention and there are no standards for quantifying their values.According to the practical needs of the planning and construction of Tianfu New Area,this study combines literature surveys and expert-based interviews,and carries out theoretical and practical research on ecosystem service value based on urban scenarios.This study proposes 5 physical geographic and 3 socioeconomic modifying factors based on the equivalent factor method.Meanwhile,this study builds a comprehensive dynamic evaluation model to quantify ecological space services in urbanized areas,where are deeply influenced by physical geographic and socioeconomic factors.The model modifies the spatial and temporal equivalent value,and combines the area Aj of various ecosystems and the D value of 1 standard equivalent.The results provide a scientific basis for the planning site selection and spatial layout of Tianfu New Area,which is based on the quantitative evaluation of services value of urban ecological spaces.Besides,this study hopes to support the performance evaluations of urban ecological spaces,value transformations,as well as optimizations of the ecological space patterns,and support the implementation of the national strategy of ecological civilization construction.