应用森林健康理论，分析得出威胁祁连山森林健康的主要自然灾害为病虫鼠害、雪折、风倒滑坡、气候干旱及森林组成和林分结构不合理；
According to the theory of forestry health, the forestry health in Qilian Mountain is affected by mice pest, snow break, landslide, drought and unreasonal forestry stand structure and so on.
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。
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.
森林健康是美国近十多年来在森林病虫火防治实践中形成的一种新的理论。
Forest health is a new theory produced in control practice of forest pest and fire in recent ten years.
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