湖北省水杉立地指数表的编制

Compilation of site index table of Metasequoia glyptostroboides in Hubci province

立地指数是评价林地质量的数量化指标。本文选用的综合数学模型编表,既能模拟不同立地条件下林木生长过程,又能通过筛选不同的参数与立地指数的相关方程来模拟不同树种的高生长规律。误差检验结果表明:综合模型编表的精度比相对百分数法编表的精度提高3—6倍。该模型较好地解决了模拟并非遵循同一规律的生长曲线这一难题,同时便于电算,因此具有广阔地应用前景。

The site index is the amount parameter of evaluating the quality of the forest land. The report used a synthetical methematical model for organzation the site index table. This method can not only simulate the growth of forest trees under the different conditions but also simulate the regular pattern of rapid growth in different trees by screening the different parameters and the site indexes of the relevant equation. The result of error-examination shows: the precision is higher 3—6 times when the synthetical methematical model is used than when the neethod of relevant percent is used, This model can solve the problem which the growth curve cau't abide by the regular battern of the forest trees. Concurrently, it is used by electronic computer, so the model is used widely.