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以华北地区71块栓皮栎天然次生林标准地和58株平均优势木解析木的514对树高-年龄数据作为编表材料,从12个数学模型中选定lgH=-0.2059+0.7700lgA作为导向曲线,基准年龄为50年,指数级距为2m,运用标准差调整法导出7～17m6条地位指数曲线,最终得到华北地区栓皮栎天然次生林地位指数表。相关系数检验、拟合显著性检验和预报精度检验表明:所编地位指数表精度较高,可用于华北地区栓皮栎天然次生林立地质量评价。
A total of 514 pairs of tree height-age data from 71 Quercus variabilis natural secondary forests in North China were used as the tabulated materials. LgH = -0.2059 + 0.7700lgA was selected as the guide curve from 12 mathematical models , The reference age is 50 years, and the exponential distance is 2m. The standard deviation adjustment method is used to derive the land index curve of 7 ~ 17m6. Finally, the natural secondary forest status index of Quercus variabilis in North China is obtained. Correlation coefficient test, fitting significance test and forecasting accuracy test showed that the index of status index was higher and could be used for site quality evaluation of natural secondary forest of Quercus variabilis in North China.