黄龙山林区油松人工林立地质量评价研究
On Site Quality Evaluation of Pinus tabuliformis Plantation in the Forest Region of Huanglong Mountain

以陕西黄龙山林区油松人工林为对象，在现地调查的基础上，运用主成分分析法与数量化理论Ⅰ，根据贡献率排序筛选出4个主导因子（海拔＞坡向＞坡位＞土壤厚度），将样地划分为24个立地类型区，建立了油松人工林立地质量评价模型，对黄龙山人工油松林进行立地质量评价。结果表明，有70.83%的样地立地质量在中等以上。森林立地分类及立地质量评价对于了解林分现状，提升林地景观状态与经营水准，充分发挥森林生产潜力具有重要意义。
Forest site quality evaluation and classification are of significant importance for understanding the stand status and improving the condition of forest landscape and management level,as well as for fully realizing the potential of forest production.In this paper,plantations of Pinus tabuliformis,one of the main afforestation tree species occurring in Huanglong Mountain were taken as the research objects to conduct site quality evaluation.Based on the survey of sample plots,and using the theory of quantification I,4 key factors were screened out according to their contribution rates:altitude>slope aspect>position>soil thickness,from which the sample plots were divided into 24 site types,and the site quality evaluation model was established.The evaluation results indicated that 70.83% of the sample sites were at medium and above levels in quality