基于PCA法的杭州市屋顶花园木本植物健康评价

Health Assessment of Roof Garden Trees in Hangzhou City Based on Principal Component Analysis

以杭州市5个屋顶花园为研究对象,利用主成分分析法(PCA法)构建评价模型对其木本植物健康状况进行评价,探索影响屋顶花园木本植物健康的重要因子,为杭州市屋顶花园树种选择、种植、养护提供可靠依据。结果表明:杭州市屋顶花园木本植物总体健康程度中等偏上;在评价样地中,健康、亚健康、不健康植物占比分别为52.23%、38.84%、8.93%;各科植物中,卫矛科(Celastraceae)、苏铁科(Cycadaceae)、海桐科(Pittosporaceae)植物平均综合得分最高;植物的冠形、树干损伤、生长空间压迫、光污染以及病虫害等是限制其健康的重要因子。

Taking 5 roof gardens in Hangzhou as the research object,the principal component analysis method(PCA method)is used to construct an evaluation model to evaluate the health of woody plants,and to explore the important factors affecting the health of woody plants in roof gardens.The results showed that the overall health of woody plants in the roof gardens of Hangzhou was moderately high;in the evaluation plots,the proportions of healthy,sub-healthy,and unhealthy plants were 52.23%,38.84%,and 8.93%respectively;among the plants of all families,Celastraceae,Cycadaceae,and Pittaceae plants are highest in average comprehensive scores;the crown shape,trunk damage,growth space compression,light pollution,and pests and diseases are important factors affecting their health.