西宁市青海云杉人工林健康评价研究

Study on Health Evaluation of Picea Crassifolia Kom.Plantation in Xining City

本文以西宁市南北山20-30a生青海云杉人工林为研究对象,选定树高年生长量、胸径年生长量等10个评价指标进行赋值和无量纲化处理,并用变异系数法确定其权重,通过参考健康度指标(HI)构建评价模型和正态等距法确定健康等级标准,最终分析并得出西宁市南北山青海云杉人工林健康水平。研究结果表明,各健康等级的取值范围为:不健康[0.22,0.33]、中健康[0.34,0.45]、亚健康[0.46,0.57]、健康[0.58,0.69];人工林中达到健康水平的有17%、亚健康的占42%、中健康的占28%、不健康的占13%,从隶属度最大的原则上分析,西宁市南北山青海云杉人工林以亚健康状态为主。

In this study,20-30 year-old Picea crassifolia Kom.plantations in the southern and northern mountains of Xining City were selected as the research object,ten evaluation indicators such as annual growth of tree height and annual growth of diameter at breast height were selected for assignment and dimensionless treatment,and the coefficient of variation method was used to determine its weight,constructing an evaluation model by referring to the health index(HI)and determining the health grade standard by the normal isometric method to finally analyze and get the health level of Picea crassifolia Kom.plantation in the southern and northern mountains of Xining.The research results showed that the range of values for each health level is:unhealthy[0.22,0.33],moderately healthy[0.34,0.45],sub-healthy[0.46,0.57],healthy[0.58,0.69],those that reach healthy levels in plantations are 17%,sub-healthy 42%,medium-healthy 28%,and unhealthy 13%.By analyzing of the highest principle of membership,the Picea crassifolia Kom.plantation in the southern and northern Mountains of Xining City is mainly sub-healthy.