基于Meta回归方法的中国城市森林生态系统服务功能价值再评估

在综合国内若干城市生态系统服务功能价值研究实例的基础上,构建了中国城市森林生态系统服务功能价值转移数据库和相应的Meta回归分析模型,对价值转移评估的影响因素进行了全面探讨,并对该模型的样本外价值转移的有效性进行了检验.研究结果表明:(1)中国城市森林生态系统服务功能的平均价值为5.868 万元/hm2·a,按照价值高低排序依次为:涵养水源＞固碳释氧＞保育土壤＞生物多样性保护＞净化大气环境＞森林游憩＞积累营养物质,且总体呈现出西部地区＞东部地区＞中部地区的区位分布特征;(2)城市森林生态系统服务功能的评估方法、类型因素,城市的区位、人口、经济因素和研究区面积因素都是影响城市森林生态系统服务功能价值变化的主要因素;(3)所构建的Meta价值转移模型的样本外价值转移的平均转移误差为18.54％,用于研究样本外价值转移估计的有效性较好.

Revaluation of Urban Forest Ecosystem Services Function in China: Based on Meta-Regression Analysis

On the basis of synthesizing several empirical studies on the value of urban ecosystem services in China, this study constructed the value transfer database of urban forest ecosystem services in China and the corresponding meta-analysis model. The influencing factors of value transfer assessment were discussed comprehensively, and the validity of out-of-sample value transfer of the meta-analysis value model was tested. The results show that: (1) the average value of urban forest ecosystem service function in China is 58 thousand and 680 yuan per hm2peryear, and the order of value is water conservation > carbon fixation and oxygen release > soil conservation > biodiversity protection > atmospheric environment purification > forest recreation > nutrients accumulation, and which mainly shows the regional distribution characteristics of Western > Eastern > Central areas; (2) the assessment methods and types of urban forest ecosystem services, urban location, population, economic factors, and area factors are the main factors affecting the value change of urban forest ecosystem services; (3) the average transfer error of out-of-sample value transfer of Meta-analysis value model constructed by this study is 18.54%, which shows that the validity of this method is good.