广州市城市森林健康评价

Urban Forest Health Evaluation in Guangzhou City

文章对广州市城市森林健康进行评价,在全面踏查基础上,选取样地89块,记录样地信息及其中的乔木和灌木生长情况。将广州城市森林分为行道绿化、森林公园、街心绿地和城市公园4种类型;在林分尺度上,以VOR模型为基础建立评价指标体系,运用专家咨询法、层次分析法确定指标权重,运用综合指标评价法计算广州城市森林健康评价值。结果表明,所有样地综合指数平均值为0.6535(!=0.0091),属于健康等级。其中良好健康样地占22.5%,健康66.3%,亚健康11.2%,说明广州市城市森林总体健康,少数为亚健康;影响城市森林健康的原因主要包括林分结构简单、病虫危害、人为因素3方面。

The paper evaluated the urban forest health in Guangzhou City. On the basis of a comprehensive reconnaissance,89 plots were selected to record plots information and the growth of trees and shrubs. Urban forests in Guangzhou was divided into four types,i. e.,avenue planting areas,forest parks,roadside green spaces and urban park. On the scale of forest stands,the urban forest health evaluation value was calculated by using comprehensive indicator evaluation system established on VOR model,with the methods of Delphi and analytic hierarchy process used to determine attribute weights. The results showed that the average value of composite index of all plots was0. 6535（ the standard deviation equaled to 0. 0091）,indicating a healthy level. Among all the plots,the proportions of ＂good health＂,＂health＂and ＂sub-health＂were 22. 5%,66. 3% and 11. 2%,respectively,which indicated that the urban forests in Guangzhou were overall in healthy state with a few of them in sub-healthy state. The reasons that influenced the health of urban forest included forest structure,pest and disease and human factor.