基于不同立地因子的杉木与马尾松地位指数相关模型

Study of the Interrelated Model for the Site Indexes of Chinese Fir and Pinus massoniana

偏差较大、精度不够高是地位指数相关模型应用的关键问题．通过科学地划分雪峰山地区的立地因子，有效地选择立地因子，采用SPSS对雪峰山地区324块同时具有杉木和马尾松地位指数值数据的样地进行11种方程的模拟分析，建立了基于立地因子的雪峰山杉木与马尾松地位指数相关模型，模拟效果较好；预测误差绝对差值分布在0～0．7m之间，95％以上分布在0.3m左右．解决了地位指数代换偏差较大、精度不够高的问题，提高了模型的实用性能．

Warping or low precision is a pivotal problem in the application of site index interrelated model. By scientifically classifying the site factors of Xuefeng Mountain, effectively choosing the site factors and using SPSS to simulate the relation of site indexes about Chinese fir and Pinus massoniana at the same site with 11 kinds of equations, this paper has established an interrelated model for both of them, the effect of modeling being good. The absolute value of prediction error is within 0～0. 7 m, and about 95% of the values come closely to 0～0. 3 m. Therefore, the key problem of the model has been solved and its practicability improved.