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树高与年龄的关系叫做立地指数,它已被用来评定单一树种或近于纯林组成的同龄林分的立地质量。通常选取优势木和亚优势木的树高代表决定立地指数的林分高,以优势木或亚优势木在标准年龄长到的平均高来规定立地指数。作者在张掖森林管理局和各有关林场协助下探索性地编制了《祁连山北坡云杉立地指数表》以供参考。
The relationship between tree height and age is called site index, which has been used to assess the site quality of single-species or near-pure stands of the same age. Usually select the dominant tree and sub-dominating tree height representatives to determine the location of the high stand index, the dominant or sub-dominating wood in the standard age to the average high to set the site index. With the help of Zhangye Bureau of Forest Management and related forest farms, the author exploratoryly compiled “Site Index of Spruce on the Northern Qilian Mountains” for reference.