东大河林区青海云杉林健康评价

以2008年青海云杉（Picea classifolia）林样地调查资料为基础，用主成分分析、聚类分析、森林健康综合评价模型的方法，对东大河林区青海云杉林的森林健康状况进行了综合评价，结果表明，反映青海云杉林健康状况的自然环境、群落特征、恢复力、生产力和生产潜力5个方面19个指标，能够初步构建青海云杉林的健康评价指标体系。影响青海云杉林健康状况的主要指标有群落类型、郁闭度、灌木层盖度、林分蓄积量、土壤吸湿水、土壤含水率6个。将13个青海云杉林样地划分为健康、亚健康、不健康3类，健康样地包括7个苔藓-青海云杉林样地，占53.82%；亚健康林包括1个苔藓-青海云杉林样地和3个草类-青海云杉林样地，占30.77%；不健康林包括2个灌木-青海云杉林样地，占15.38%。

Health assessment of Picea classifolia forest in the Dongdahe forest region

Based on field survey data during 2008,the principal component analysis,cluster analysis and model of health assessment were used to assess the health state of Picea classifolia in the Dongdahe forest region by establishing the health indicators system,which included 19 indicators belonging to five strategy layers,and they were natural environment,community characteristic,stand resilience,productivity and potentialities.This study showed that the principal indicators affecting the health state of P.classifolia forest were community type,canopy closure,shrub coverage,stand volume,soil hygroscopic water,and soil moisture content.The assessment results indicated that the 13 sample plots were divided into health,sub-health and poor health.The health sample plots were 7 and were moss P.classifolia forest,accounting for 53.82%;the sub-health included one moss P.classifolia forest and three herb P.classifolia forests and they accounted for 30.77%;and the poor health plots were 2 shrub P.classifolia forest and accounted for 15.38% of total area.