西宁市油松人工林健康评价分析

Health evaluation of Pinus tabuliformis plantation in Xining

【目的】研究西宁市南北山生长20~30 a油松人工林健康水平,为西宁市油松人工林的发展及后期抚育管理提供依据.【方法】以西宁市南北山油松人工林为研究对象,运用主成分分析法筛选出包括树高年生长量、胸径年生长量、冠幅等11个评价指标,运用正态等距分析法对经过健康度指标(HI)得到的各标准地的健康指数进行分析.【结果】健康等级取值范围可分为健康[0.565,0.67]、亚健康[0.460,0.564]、中健康[0.355,0.459]、不健康[0.25,0.354]4种;确定出西宁市油松人工林中健康人工林占15%,亚健康人工林占35%,中健康人工林占31.67%,不健康人工林占18.33%.【结论】按照隶属度最大原则,西宁市南北山油松人工林的健康等级为亚健康.

【Objective】 The health level of 20~30 years old Pinus tabuliformis plantation in the north and south mountains of Xining City was studied in order to provide the parameters for the cultivation management.【Method】 P.tabuliformis plantation in the north and south mountain of Xining City was selected as the research area and 11 evaluation indexes including annual growth height,annual growth DBH and crown width were screened out through principal component analysis,and the health indexes of each standard plot obtained by health index(HI) were analyzed with normal isometric analysis.【Result】 The value range of health level was divided into 4 categories: healthy [0.565,0.67],sub-healthy [0.460,0.564],moderately healthy [0.355,0.459] and unhealthy [0.25,0.354].The percentage for each category was 15%(healthy),35%(sub-healthy),31.67%(moderately healthy),and 18.33%(unhealthy) respectively.【Conclusion】 According to the principle of maximum membership,the health grade of P.tabuliformis plantation in south and north mountains of Xining City is sub-healthy.