湖州市杉木林立地质量的数量化评价

Quantizing Evaluation of Site Quality for Chinese Fir Forests in Huzhou City

本文运用数量化理论Ⅰ模型对湖州市杉木实生林地位指数与多元立地因子之间的关系进行了回归。分析结果表明,在所选择的项目中发现对地位指数起主导影响作用的是母岩、土壤类型、土层厚度和坡度,起次主导作用的是坡位、土壤容重、土壤有机质和硝态氮含量。对剩余标准差S_y,复相关系数R_(ym),偏相关系数r_(ym),以及残差绝对值和相对值分布的检验结果证明,本得分表的精度较高,可应用于生产实际,并且以运用模型7和模型8为好,既可保证一定精度,又简便易行。

The regression equation between site index and site factors which were closely relation to the growth of Chinese fir forests in Huzhou City was estabilished using quantitative theory I model; and the scoring table of site quality was given out. The test results showed that the factors which taken a leading effect to site index were mother rocks, soil types, soil layer deep and gradient; and which taken a subleading effect were plot position, soil porosity, soil organic matter content and nitrate nitrogen content. The precision of the scoring table was higher; prediction error was less than a unit of index class (2m). This table was sample and convenient to guide forest management.