主成分投影法在城市生态系统健康评价中的应用

将健康概念引入到城市生态系统中研究,从复合生态系统角度评价和辨析城市生态环境问题,为生态城市建设提供决策依据极具现实意义.文章以宁波市生态系统为例,利用主成分投影法评价城市生态系统健康状况,评价结果表明：宁波市的生态系统健康状况有所上升,但健康改善程度并不显著.主成分投影法从时间上较好地反映了城市生态系统健康的走势,具有一定的推广和实用价值.

The Application of Principal Component Projection to Assessment of Urban Ecosystem Health

It is of great significance to introduce the concept of health into the study of urban ecosystem and to assess urban environmental issues from the aspect of complex ecosystem. It can provide useful information for decision-making in eeocity construction. The principal component projeetion was applied to the assessment of urban ecosystem health of Ningbo. The result showed that the status of Ningbo urban ecosystem health had been improved,while the improvement was not so obvious. Principal component projection truly reflected the trend of system development and was worthwhile to be popularized.