亚热带日本落叶松人工林立地指数表编制

日本落叶松是湘西、鄂西高海拔山区引种栽植广泛的树种,以274块样地的优势高—林龄数据为基础,编制亚热带日本落叶松人工林立地指数表。选择6个常用的数学模型通过曲线回归、非线性回归法拟合导向曲线,编制立地指数表。研究结果表明:采用R2较高、EMS最低的对数曲线模型作为最优导向曲线;确定了基准年龄为20 a,指数级距为2 m;以16指数级树高为基准,导出立地指数曲线编成立地指数表。检验结果表明:所编立地指数表精度高、适用性强,可以良好的反映亚热带地区日本落叶松人工林的立地质量。

Site Index Table Preparation for Subtropical Larix kaempferi Plantation

With the height-age data of Larix kaempferi growing in the 274 plantation sample areas, site index table for subtropical L. kaempferi plantation was prepared. The site index table was prepared by choosing six common mathematical models and using curve regression and non-linear regression to fit the guide curve. The study result shows that adopt logarithmic curve model which has a higher R~2 and the minimum EMS(mean square error) as the optimal guide curve;confirm the basal age as 20 a and the distance between indexes is 2 m. The height of larch with index class 16 as the datumwas taken to derive the site index curve and prepare the site index table. The test result shows that the prepared site index table has a high precision with good applicability and it can well reflect the site quality of L. kaempferi planted in subtropical areas.