Based on the theory of ecosystem health, healthy condition of urban forest ecosystem in Yan 'an was analyzed and assessed by setting diagnostic indicator system.

运用生态系统健康理论建立了城市森林健康评价指标体系，对延安市不同类型城市森林进行了分析评价。

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This paper analyzed the healthy level of Mongolian oak forest ecosystem in Beijing and tried to find the influencing factors of the forest health ecosystem and proposed the control methods.

本研究以北京地区蒙古栎林生态系统为研究对象，对其健康状况进行评价。

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