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立地指数是以林分生长到标准年龄时,优势木的平均高值作为指数,简捷、明确、具体地以数量的概念指示出森林立地条件的优劣,林分生产力的高低。本项研究就是调查云杉年龄和优势木和业比势木平均高与土地生产力之间的相关关系,编制立地指数表,评定立地质量。试材取自五个林场,不同林分类型的同龄林中,共78块标准地,380株指数木,51株解析木。优势木取5株上层木。
Site index is based on the growth of the stand to the standard age, the average high value of dominant wood as an index, simple, clear, specifically the concept of quantity to indicate the pros and cons of forest site conditions, the level of productivity. This study investigates the correlation between spruce age and dominant timber and wood industry over the average height of timber and land productivity, compiles site index tables and assesses site quality. The test materials were collected from five forest farms. Among the same age forest types with different forest types, a total of 78 standard fields, 380 index woods and 51 tree woods were collected. Advantages wood take five upper wood.